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Surface phonon resonance:A new mechanism for enhancing photonic spin Hall effect and refractive index sensor
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作者 程杰 汪承龙 +3 位作者 李一铭 张亚林 刘胜利 董鹏 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第8期254-261,共8页
Metal-based surface plasmon resonance(SPR)plays an important role in enhancing the photonic spin Hall effect(SHE)and developing sensitive optical sensors.However,the very large negative permittivities of metals limit ... Metal-based surface plasmon resonance(SPR)plays an important role in enhancing the photonic spin Hall effect(SHE)and developing sensitive optical sensors.However,the very large negative permittivities of metals limit their applications beyond the near-infrared regime.In this work,we theoretically present a new mechanism to enhance the photonic SHE by taking advantage of SiC-supported surface phonon resonance(SPhR)in the mid-infrared regime.The transverse displacement of photonic SHE is very sensitive to the wavelength of incident light and the thickness of SiC layer.Under the optimal parameter setup,the calculated largest transverse displacement of SiC-based SPhR structure reaches up to 163.8 ym,which is much larger than the condition of SPR.Moreover,an NO_(2) gas sensor based on the SPhR-enhanced photonic SHE is theoretically proposed with the superior sensing performance.Both the intensity and angle sensitivity of this sensor can be effectively manipulated by varying the damping rate of SiC.The results may provide a promising paradigm to enhance the photonic SHE in the mid-infrared region and open up new opportunity of highly sensitive refractive index sensors. 展开更多
关键词 photonic spin Hall effect refractive index sensor surface phonon resonance SIC
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Disorder effects in NbTiN superconducting resonators
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作者 吕伟涛 支强 +2 位作者 胡洁 李婧 史生才 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第2期482-486,共5页
Disordered superconducting materials like NbTiN possess a high kinetic inductance fraction and an adjustable critical temperature, making them a good choice for low-temperature detectors. Their energy gap(D), critical... Disordered superconducting materials like NbTiN possess a high kinetic inductance fraction and an adjustable critical temperature, making them a good choice for low-temperature detectors. Their energy gap(D), critical temperature(T_(c)),and quasiparticle density of states(QDOS) distribution, however, deviate from the classical BCS theory due to the disorder effects. The Usadel equation, which takes account of elastic scattering, non-elastic scattering, and electro–phonon coupling,can be applied to explain and describe these deviations. This paper presents numerical simulations of the disorder effects based on the Usadel equation to investigate their effects on the △, Tc, QDOS distribution, and complex conductivity of the NbTiN film. Furthermore, NbTiN superconducting resonators with coplanar waveguide(CPW) structures are fabricated and characterized at different temperatures to validate our numerical simulations. The pair-breaking parameter α and the critical temperature in the pure state T_(c)^(P) of our NbTiN film are determined from the experimental results and numerical simulations. This study has significant implications for the development of low-temperature detectors made of disordered superconducting materials. 展开更多
关键词 effects of disorder NbTiN superconducting film Usadel equation complex conductivity superconducting resonator
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High-speed directly modulated distributed feedback laser based on detuned loading and photon-photon resonance effect
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作者 张云山 徐逸帆 +3 位作者 郑吉林 李连艳 方涛 陈向飞 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第9期274-281,共8页
A monolithic integrated two-section distributed feedback(TS-DFB)semiconductor laser for high-speed direct modulation is proposed and analyzed theoretically.The grating structure of the TS-DFB laser is designed by the ... A monolithic integrated two-section distributed feedback(TS-DFB)semiconductor laser for high-speed direct modulation is proposed and analyzed theoretically.The grating structure of the TS-DFB laser is designed by the reconstructionequivalent-chirp(REC)technique,which can reduce the manufacturing cost and difficulty,and achieve high wavelength controlling accuracy.The detuned loading effect and the photon-photon resonance(PPR)effect are utilized to enhance the modulation bandwidth of the TS-DFB laser,exceeding 37 GHz,while that of the conventional one-section DFB laser is only 16 GHz.When the bit rate of the non-return-to-zero(NRZ)signal reaches 55 Gb/s,a clear eye diagram with large opening can still be obtained.These results show that the proposed method can enhance the modulation bandwidth of DFB laser significantly. 展开更多
关键词 directly modulated laser(DML) detuned loading effect photon-photon resonance(PPR)effect reconstruction-equivalent-chirp(REC)technique
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Highly sensitive and stable probe refractometer based on configurable plasmonic resonance with nano-modified fiber core 被引量:1
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作者 Jianying Jing Kun Liu +3 位作者 Junfeng Jiang Tianhua Xu Shuang Wang Tiegen Liu 《Opto-Electronic Advances》 SCIE EI CAS CSCD 2023年第6期38-51,共14页
A dispersion model is developed to provide a generic tool for configuring plasmonic resonance spectral characteristics.The customized design of the resonance curve aiming at specific detection requirements can be achi... A dispersion model is developed to provide a generic tool for configuring plasmonic resonance spectral characteristics.The customized design of the resonance curve aiming at specific detection requirements can be achieved.According to the model,a probe-type nano-modified fiber optic configurable plasmonic resonance(NMF-CPR)sensor with tip hot spot enhancement is demonstrated for the measurement of the refractive index in the range of 1.3332-1.3432 corresponding to the low-concentration biomarker solution.The new-type sensing structure avoids excessive broadening and redshift of the resonance dip,which provides more possibilities for the surface modification of other functional nanomaterials.The tip hot spots in nanogaps between the Au layer and Au nanostars(AuNSs),the tip electric field enhancement of AuNSs,and the high carrier mobility of the WSe_(2)layer synergistically and significantly enhance the sensitivity of the sensor.Ex-perimental results show that the sensitivity and the figure of merit of the tip hot spot enhanced fiber NMF-CPR sensor can achieve up to 2995.70 nm/RIU and 25.04 RIU^(−1),respectively,which are 1.68 times and 1.29 times higher than those of the conventional fiber plasmonic resonance sensor.The results achieve good agreements with numerical simulations,demonstrate a better level compared to similar reported studies,and verify the correctness of the dispersion model.The detection resolution of the sensor reaches up to 2.00×10^(−5)RIU,which is obviously higher than that of the conventional side-polished fiber plasmonic resonance sensor.This indicates a high detection accuracy of the sensor.The dense Au layer effectively prevents the intermediate nanomaterials from shedding and chemical degradation,which enables the sensor with high stability.Furthermore,the terminal reflective sensing structure can be used as a practical probe and can allow a more convenient operation. 展开更多
关键词 fiber photonics sensor customized plasmonic resonance curve nano-modified fiber core tip hot spot effect high sensitivity and stability
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Resonance suppression and electromagnetic shielding effectiveness improvement of an apertured rectangular cavity by using wall losses 被引量:6
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作者 焦重庆 朱弘钊 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第8期404-409,共6页
The cavity-mode resonance effect could result in significant degradation of the shielding effectiveness (SE) of a shielding enclosure around its resonance frequencies. In this paper, the influence of coated wall los... The cavity-mode resonance effect could result in significant degradation of the shielding effectiveness (SE) of a shielding enclosure around its resonance frequencies. In this paper, the influence of coated wall loss on the suppression of the resonance effect is investigated. For this purpose, an equivalent circuit model is employed to analyze the SE of an apertured rectangular cavity coated with an inside layer of resistive material. The model is developed by extending Robinson's equivalent circuit model through incorporating the effect of the wall loss into both the propagation constant and the characteristic impedance of the waveguide. Calculation results show that the wall loss could lead to great improvement on the SE for frequencies near the resonance but almost no effect on the SE for frequencies far away from the resonance. 展开更多
关键词 electromagnetic shielding rectangular cavity wall losses resonance effect
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Surface plasmon resonance effect of Ag nanoparticles for improving the photocatalytic performance of biochar quantum-dot/Bi_4Ti_3O_(12) nanosheets 被引量:7
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作者 Tao Wang Xiqing Liu +4 位作者 Qiuyue Men Changchang Ma Yang Liu Wei Ma Zhi Liu 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2019年第6期886-894,共9页
Herein,we report a novel ternary material comprised of Ag nanoparticles and carbon quantum dots(CDs),which are co-loaded using 2D Bi4Ti3O12(BIT)sheets.In this system,Ag can be applied as excited electron-hole pairs in... Herein,we report a novel ternary material comprised of Ag nanoparticles and carbon quantum dots(CDs),which are co-loaded using 2D Bi4Ti3O12(BIT)sheets.In this system,Ag can be applied as excited electron-hole pairs in the Bi4Ti3O12 by transferring the plasmonic energy from the metal to the semiconductor.The surface plasmon resonance of Ag can promote the electron transfer properties of the CDs,thereby improving the separation efficiency of the electron-hole pairs.Meanwhile,the CDs can act as an electron buffer to decrease the recombination rate of the electron hole.Moreover,CDs are prepared using a biomaterial,which can provide a chemical group to enhance the electron transfer and connection.The synergistic effects of CDs,Ag,and BIT enable the design of a photocatalytic application with a remarkably improved efficiency and operational stability. 展开更多
关键词 2D material Plasmo resonance Synergistic effect Carbon quantum dot Electron buffer
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Quadratic Dissipation Effect on the Moonpool Resonance 被引量:2
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作者 LIU Heng-xu CHEN Hai-long +2 位作者 ZHANG Liang ZHANG Wan-chao LIU Ming 《China Ocean Engineering》 SCIE EI CSCD 2017年第6期665-673,共9页
This paper adopted a semi-analytical method based on eigenfunction matching to solve the problem of sharp resonance of cylindrical structures with a moonpool that has a restricted entrance. To eliminate the sharp reso... This paper adopted a semi-analytical method based on eigenfunction matching to solve the problem of sharp resonance of cylindrical structures with a moonpool that has a restricted entrance. To eliminate the sharp resonance and to measure the viscous effect, a quadratic dissipation is introduced by assuming an additional dissipative disk at the moonpool entrance. The fluid domain is divided into five cylindrical subdomains, and the velocity potential in each subdomain is obtained by meeting the Laplace equation as well as the boundary conditions. The free-surface elevation at the center of the moonpool, along with the pressure and velocity at the restricted entrance for first-order wave are evaluated. By choosing appropriate dissipation coefficients, the free-surface elevation calculated at the center of the moonpool is in coincidence with the measurements in model tests both at the peak period and amplitude at resonance. It is shown that the sharp resonance in the potential flow theory can be eliminated and the viscous effect can be estimated with a simple method in some provided hydrodynamic models. 展开更多
关键词 in-fluid quadratic dissipation viscous effect moonpool sharp resonance
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Effect of cyclotron resonance on ‘hot’ dispersion in a staggered double metallic grating sheet beam travelling wave tube 被引量:1
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作者 Jing WANG Yu FAN +3 位作者 Chen YANG Ding ZHAO Gang WANG Jirun LUO 《Plasma Science and Technology》 SCIE EI CAS CSCD 2019年第8期89-96,共8页
Based on the beam wave synchronous interaction in transverse and longitudinal directions at the same time and starting from Maxwell’s equation and linear Vlasov equation, the beam–wave interaction ‘hot’ dispersion... Based on the beam wave synchronous interaction in transverse and longitudinal directions at the same time and starting from Maxwell’s equation and linear Vlasov equation, the beam–wave interaction ‘hot’ dispersion equation considering both cyclotron resonance and Cherenkov resonance in a staggered double metallic grating traveling wave tube is deduced.Through the reasonable selection for geometric and electrical parameters, the numerical calculation and analysis of the ‘hot’ dispersion equation shows that the beam–wave interaction gain and frequency band with the cyclotron resonance enhancement effect are higher than those with only Cherenkov resonance radiation. 展开更多
关键词 staggered DOUBLE METALLIC GRATING SHEET BEAM travelling wave TUBE cyclotron resonance Cherenkov effects gain
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Nonlocal and strain gradient effects on nonlinear forced vibration of axially moving nanobeams under internal resonance conditions 被引量:1
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作者 Jing WANG Yilin ZHU +2 位作者 Bo ZHANG Huoming SHEN Juan LIU 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2020年第2期261-278,共18页
Based on the nonlocal strain gradient theory(NSGT), a model is proposed for an axially moving nanobeam with two kinds of scale effects. The internal resonanceaccompanied fundamental harmonic response of the external e... Based on the nonlocal strain gradient theory(NSGT), a model is proposed for an axially moving nanobeam with two kinds of scale effects. The internal resonanceaccompanied fundamental harmonic response of the external excitation frequency in the vicinities of the first and second natural frequencies is studied by adopting the multivariate Lindstedt-Poincaré(L-P) method. Based on the root discriminant of the frequencyamplitude equation under internal resonance conditions, theoretical analyses are performed to investigate the scale effects of the resonance region and the critical external excitation amplitude. Numerical results show that the region of internal resonance is related to the amplitude of the external excitation. Particularly, the internal resonance disappears after a certain critical value of the external excitation amplitude is reached.It is also shown that the scale parameters, i.e., the nonlocal parameters and the material characteristic length parameters, respectively, reduce and increase the critical amplitude,leading to a promotion or suppression of the occurrence of internal resonance. In addition,the scale parameters affect the size of the enclosed loop of the bifurcated solution curves as well by changing their intersection, divergence, or tangency. 展开更多
关键词 scale effect AXIALLY MOVING nanobeam INTERNAL resonance critical AMPLITUDE
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A switchable high-sensitivity strain sensor based on piezotronic resonant tunneling junctions
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作者 Gongwei Hu Li Zeng +3 位作者 Fobao Huang Shuaiwei Fan Qiao Chen Wei Huang 《Nano Research》 SCIE EI CSCD 2024年第11期10242-10255,共14页
Developing emerging technologies in Internet of Things and artificial intelligence requires high-speed, low-power, high-sensitivity, and switchable-functionality strain sensors capable of sensing subtle mechanical sti... Developing emerging technologies in Internet of Things and artificial intelligence requires high-speed, low-power, high-sensitivity, and switchable-functionality strain sensors capable of sensing subtle mechanical stimuli in complex ambience. Resonant tunneling diodes (RTDs) are the good candidate for such sensing applications due to the ultrafast transport process, lower tunneling current, and negative differential resistance. However, notably enhancing sensing sensitivity remains one of the greatest challenges for RTD-related strain sensors. Here, we use piezotronic effect to improve sensing performance of strain sensors in double-barrier ZnO nanowire RTDs. This strain sensor not only possesses an ultrahigh gauge factor (GF) 390 GPa^(−1), two orders of magnitude higher than these reported RTD-based strain sensors, but also can switch the sensitivity with a GF ratio of 160 by adjusting bias voltage in a small range of 0.2 V. By employing Landauer–Büttiker quantum transport theory, we uncover two primary factors governing piezotronic modulation of resonant tunneling transport, i.e., the strain-mediated polarization field for manipulation of quantized subband levels, and the interfacial polarization charges for adjustment of space charge region. These two mechanisms enable strain to induce the negative differential resistance, amplify the peak-valley current ratio, and diminish the resonant bias voltage. These performances can be engineered by the regulation of bias voltage, temperature, and device architectures. Moreover, a strain sensor capable of electrically switching sensing performance within sensitive and insensitive regimes is proposed. This study not only offers a deep insight into piezotronic modulation of resonant tunneling physics, but also advances the RTD towards highly sensitive and multifunctional sensor applications. 展开更多
关键词 piezotronic effect resonant tunneling diode negative differential resistance highly sensitive strain sensor ZnO nanowire ratio of gauge factor
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Combined Effect of Classical Chaos and Quantum Resonance on Entanglement Dynamics
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作者 谭金桃 罗云荣 +1 位作者 周政 海文华 《Chinese Physics Letters》 SCIE CAS CSCD 2016年第7期1-4,共4页
We use linear entropy of an exact quantum state to study the entanglement between internal electronic states and external motional states for a two-level atom held in an amplitude-modulated and tilted optical lattice.... We use linear entropy of an exact quantum state to study the entanglement between internal electronic states and external motional states for a two-level atom held in an amplitude-modulated and tilted optical lattice. Starting from an unentangled initial state associated with the regular 'island' of classical phase space, it is demonstrated that the quantum resonance leads to entanglement generation, the chaotic parameter region results in the increase of the generation speed, and the symmetries of the initial probability distribution determine the final degree of entanglement. The entangled initial states are associated with the classical 'chaotic sea', which do not affect the final entanglement degree for the same initial symmetry. The results may be useful in engineering quantum dynamics for quantum information processing. 展开更多
关键词 of IT in for Combined effect of Classical Chaos and Quantum resonance on Entanglement Dynamics on
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Fano Resonance Effect in CO-Adsorbed Zigzag Graphene Nanoribbons
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作者 Gao Wang Meng-Qiu Long Dan Zhang 《Chinese Physics Letters》 SCIE CAS CSCD 2017年第9期91-94,共4页
Quantum interference plays an important role in tuning the transport property of nano-devices. Using the non- equilibrium Green's Function method in combination with density functional theory, we investigate the infl... Quantum interference plays an important role in tuning the transport property of nano-devices. Using the non- equilibrium Green's Function method in combination with density functional theory, we investigate the influence to the transport property of a CO molecule adsorbed on one edge of a zigzag graphene nanoribbon device. Our results show that the CO molecule-adsorbed zigzag graphene nanoribbon devices can exhibit the Fano resonance phenomenon. Moreover, the distance between CO molecules and zigzag graphene nanoribbons is closely related to the energy sites of the Fano resonance. Our theoretical analyses indicate that the Fano resonance would be attributed to the interaction between CO molecules and the edge of the zigzag graphene nanoribbon device, which results in the localization of electrons and significantly changes the transmission spectrum. 展开更多
关键词 DOS Fano resonance effect in CO-Adsorbed Zigzag Graphene Nanoribbons CO
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Signal modulating noise effect in bistable stochastic resonance systems and its analog simulation
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作者 肖方红 闫桂荣 谢世成 《Journal of Central South University of Technology》 EI 2006年第5期595-597,共3页
The effect of signal modulating noise in bistable stochastic resonance systems was studied theoretically and experimentally. A mathematical analysis was made on the bistable stochastic resonance model with small syste... The effect of signal modulating noise in bistable stochastic resonance systems was studied theoretically and experimentally. A mathematical analysis was made on the bistable stochastic resonance model with small system parameters. An analogue circuit was designed to perform the effect. The effect of signal modulating noise was shown in the analog simulation experiment. The analog experiment was conducted for two sinusoidal signals with different frequencies. The results show that there are a sinusoidal component corresponding to the input sinusoidal signal and a noise component presented as a Wiener process corresponding to the input white noise in the system output. By properly selecting system parameters, the effect of signal modulating noise can be manifested in the system output. 展开更多
关键词 signal modulating noise effect bistable system stochastic resonance analog simulation
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Resonance Effect in Interaction Between South Asian Summer Monsoon and ENSO During 1958-2018
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作者 YUAN Shuai XU Jian-jun +2 位作者 CHAN J C L CHIU Long-sang PAN Yu-shan 《Journal of Tropical Meteorology》 SCIE 2020年第2期137-149,共13页
The study has shown that the shear component of the vertical integrated kinetic energy(Ks)over the box(40oE-100oE,0-20oN)can be used to measure the intensity of the South Asian summer monsoon(SASM).Based on its value ... The study has shown that the shear component of the vertical integrated kinetic energy(Ks)over the box(40oE-100oE,0-20oN)can be used to measure the intensity of the South Asian summer monsoon(SASM).Based on its value averaged between June and August,the SASM can be divided into strong and weak monsoon episodes.Between1958 and 2018,there existed 16(16)strong(weak)monsoon episodes.Based on the calendar year,the relationship between the SASM and ENSO episodes can be grouped into six patterns:weak monsoon-El Ni?o(WM-EN),normal monsoon-El Ni?o(NM-EN),weak monsoon-non ENSO(WM-NE),strong monsoon-La Ni?a(SM-LN),normal monsoon-La Ni?a(NM-LN)and strong monsoon-non ENSO(SM-NE).Previous studies suggest that the WM-EN and SM-LN patterns reflect the correlated relationship between the SASM and El Ni?o/Southern Oscillation(ENSO)events.Therefore,we name these two strongly coupled categories WM-EN and SM-LN as the resonance effect.Two important circulations,i.e.,Walker circulation(WC)and zonal Asian monsoon circulation(MC),in the vertical plane are found to be not always correlated.The MC is controlled by thermal gradients between the Asian landmass and the tropical Indian Ocean,while the WC associated with ENSO events is primarily the east-west thermal gradient between the tropical South Pacific and the tropical Indian Ocean.Furthermore,the gradient directions caused by different surface thermal conditions are different.The main factor for the resonance effect is the phenomenon that the symbols of SSTA in the tropical Indian Ocean and the equatorial eastern Pacific are the same,but are opposite to that of the SSTA near the maritime continent. 展开更多
关键词 South Asian Summer Monsoon ENSO resonance effect monsoon circulation Walker circulation
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Substrate Effect on Plasmon Resonance of a Gold Nanoparticle Embedded Amorphous BaTiO<sub>3</sub>Film
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作者 S. Ramakanth K. C. James Raju 《Soft Nanoscience Letters》 2013年第4期32-35,共4页
Two sets of gold nanoparticles (NP) embedded in amorphous BaTiO3 films were prepared by sol-gel method using spin coating. Sample (1) is having BaTiO3 sol with 0.025 gm of Chloroauric acid dissolved in 10 ml of propan... Two sets of gold nanoparticles (NP) embedded in amorphous BaTiO3 films were prepared by sol-gel method using spin coating. Sample (1) is having BaTiO3 sol with 0.025 gm of Chloroauric acid dissolved in 10 ml of propan-2-ol, while sample (2) is having 0.086 gm of Chloroauric acid in the same amount of propan-2-ol. The films have been deposited on various substrates like borosilicate glass and fused silica. TEM images show that the particles are of 5 and 10 nm in size for the two set of samples, and some are having elongated morphology. Optical absorption properties of these films reveal the substrate and size effect on localised surface plasmon resonance (SPR). It shows a marginal red shift in the plasmon resonance peak from 414 nm to 420 nm in the case of sample (1) and 566 nm to 568 nm for sample (2) as the substrate changed from borosilicate glass to fused silica. It also shows red shift in Plasmon peak as the size increases from 5 to 10 nm and coincides with Mie explanation for the shift with size. 展开更多
关键词 GOLD Nanoparticles GOLD NP EMBEDDED Dielectrics Substrate and Size effect on PLASMON resonance
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Improvement on application of Dancoff factor and resonance interference table
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作者 Yu Han Xiao-Feng Jiang De-Zhong Wang 《Nuclear Science and Techniques》 SCIE CAS CSCD 2016年第2期122-130,共9页
An improvement for application of Dancoff factor is developed. It combines Stamm'ler's two-term method for resonance integral calculation with neutron current method for Dancoff factor calculation. Stamm'l... An improvement for application of Dancoff factor is developed. It combines Stamm'ler's two-term method for resonance integral calculation with neutron current method for Dancoff factor calculation. Stamm'ler's formulation, which is originally derived for the infinite lattice geometry, can be easily revised to contain the Dancoff factor explicitly, while the neutron current method can easily calculate the Dancoff factor for general irregular assembly geometry. For the resonance interference effects the resonance interference factor table is built in pairs of nuclides, only for the interference between 238 U and other resonance nuclides, spanning over a range of background cross-section and number density ratio of the pairing nuclides. A series of verification calculations have been carried out for problems of infinite lattice and single assembly geometry, with two or multiple resonance absorbers. For these verification calculations, our improvement on Dancoff factor application and resonance interference give good results. 展开更多
关键词 共振干涉 因子和 应用 积分计算 几何形状 干涉效应 中子流 核素
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Low-Energy Electron Attachment to Serine Conformers: Shape Resonances and Dissociation Dynamics 被引量:1
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作者 王永峰 田善喜 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2017年第2期173-185,I0001,共14页
Shape resonances of electron-molecule system formed in the low-energy electron attachment to four low-lying conformers of serine (serine 1, serine 2, serine 3, and serine 4) in gas phase are investigated using the q... Shape resonances of electron-molecule system formed in the low-energy electron attachment to four low-lying conformers of serine (serine 1, serine 2, serine 3, and serine 4) in gas phase are investigated using the quantum scattering method with the non-empirical model potentials in single-center expansion. In the attachment energy range of 0-10 eV, three shape resonances for serine 1, serine 2, and serine 4 and four shape resonances for serine 3 are predicted. The one-dimensional potential energy curves of the temporary negative ions of electron-serine are calculated to explore the correlations between the shape resonance and the bond cleavage. The bond-cleavage selectivity of the different resonant states for a certain conformer is demonstrated, and the recent experimental results about the dissociative electron attachment to serine are interpreted on the basis of present calculations. 展开更多
关键词 SERINE Conformational effect Shape resonance Dissociative electron attach-ment
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Elucidating solvent effects on the stability of phenoxyl radicals in monohydric alcohols via electron paramagnetic resonance
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作者 Xinyu Wang Wenjing Sun +1 位作者 Yongtao Wang Haoran Li 《Green Chemical Engineering》 EI CSCD 2024年第4期483-488,共6页
Research on solvent effects is an important and long-standing topic,but there still is some room,especially for the special solvent effect of fluoroalcohols.In this work,we investigated the stability of phenoxyl radic... Research on solvent effects is an important and long-standing topic,but there still is some room,especially for the special solvent effect of fluoroalcohols.In this work,we investigated the stability of phenoxyl radical in monohydric alcohol solvents through in-situ electron paramagnetic resonance detections.The decay behavior of phenoxyl radical showed a reasonable relationship with the mesoscopic structure of alcohols,characterized by smalland wide-angle X-ray scattering.Moreover,the distinct solvent effects of fluoroalcohols were emphasized,and the significant influence of van der Waals distance in the solvents was suggested.Overall,the stability of phenoxyl radical in alcohols was quantified and correlated with the solvent structures.We believe that the established method for stability study on radicals will encourage solvent effect studies on various organic reactions,and the proposed solvent effects in fluoroalcohols may inspire the development of green solvents in both industrial conversions and organic synthesis. 展开更多
关键词 Solvent effect FLUOROALCOHOL Phenoxyl radical STABILITY Electron paramagnetic resonance
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Anisotropic Plasmon Resonance Enables Spatially Controlled Photothermal and Photochemical Effects in Hot Carrier-Driven Catalysis
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作者 Jiaqi Wang Zhijie Zhu +15 位作者 Kai Feng Shuang Liu Yuxuan Zhou Ifra Urooj Jiari He Zhiyi Wu Jiahui Shen Xu Hu Zhijie Chen Xudong Dong Manzar Sohail Yanyun Ma Jinxing Chen Chaoran Li Xingda An Le He 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2024年第16期1877-1885,共9页
Localized surface plasmon resonance has been demonstrated to provide effective photophysical enhancement mechanisms in plasmonic photocatalysis.However,it remains highly challenging for distinct mechanisms to function... Localized surface plasmon resonance has been demonstrated to provide effective photophysical enhancement mechanisms in plasmonic photocatalysis.However,it remains highly challenging for distinct mechanisms to function in synergy for a collective gain in catalysis due to the lack of spatiotemporal control of their effect.Herein,the anisotropic plasmon resonance nature of Au nanorods was exploited to achieve distinct functionality towards synergistic photocatalysis.Photothermal and photochemical effects were enabled by the longitudinal and transverse plasmon resonance modes,respectively,and were enhanced by partial coating of silica nanoshells and epitaxial growth of a reactor component.Resonant excitation leads to a synergistic gain in photothermal-mediated hot carrier-driven hydrogen evolution catalysis.Our approach provides important design principles for plasmonic photocatalysts in achieving spatiotemporal modulation of distinct photophysical enhancement mechanisms.It also effectively broadens the sunlight response range and increases the efficacy of distinct plasmonic enhancement pathways towards solar energy harvesting and conversion. 展开更多
关键词 Plasmon resonance Photothermal effect PHOTOCHEMISTRY PHOTOCATALYSIS Metal nanoparticles Charge carrier injection Heterogeneous catalysis PHOTOELECTROCHEMISTRY
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NUMERICAL STUDIES ON RESONANT AND ENHANCEMENT EFFECTS FOR COUPLING OF MICROWAVE PULSES INTO NARROW SLOTS 被引量:6
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作者 Wang Jianguo Yu Hanqing Liu Guozhi Chen Yusheng Fan Ruyu (Northwest Institute of Nuclear Technology, Branch 15, P. O. Box 69, Xi’an 710024)Ge Debiao(Department of Physics, Xidian University, Xi’an 710071) 《Journal of Electronics(China)》 1998年第2期174-181,共8页
In this paper, modifications to the finite-difference time-domain(FD-TD) method for modeling microwave pulse coupling into a slot, which is much narrower than one conventional FD-TD cell, are discussed. The coupling p... In this paper, modifications to the finite-difference time-domain(FD-TD) method for modeling microwave pulse coupling into a slot, which is much narrower than one conventional FD-TD cell, are discussed. The coupling process of microwave pulse into a slot is studied by using the modified FD-TD method, and the dependence of microwave coupling on slot sizes, the carrier frequencies and the polarization directions of the incident waves is analysed. Resonant and enhancement effects which occur in this process are observed. The condition at which the resonant effect takes place is also presented. 展开更多
关键词 Microwave pulse COUPLING Enhancement effect resonant effect FINITE-DIFFERENCE TIME-DOMAIN
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