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Nonreciprocal Single Photon Frequency Conversion via Chiral Coupling between a V-Type System and a Pair of Waveguides
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作者 Ce Shi Mu-Tian Cheng +4 位作者 Xiao-San Ma Dong Wang Xianshan Huang Bing Wang Jia-Yan Zhang 《Chinese Physics Letters》 SCIE CAS CSCD 2018年第5期34-38,共5页
The single photon frequency conversion is investigated theoretically in the system composed of a V-type system chiral coupling to a pair of waveguides. The single photon scattering amplitudes are obtained using the re... The single photon frequency conversion is investigated theoretically in the system composed of a V-type system chiral coupling to a pair of waveguides. The single photon scattering amplitudes are obtained using the real-space Hamiltonian. The calculated results show that the probability of single photon frequency down-or up-conversion can reach a unit by choosing appropriate parameters in the non-dissipative system with perfect chiral coupling.We present a nonreciprocal single photon beam splitter whose frequency of the output photon is different from that of the input photon. The influences of dissipations and non-perfect chiral coupling on the single frequency conversion are also shown. Our results may be useful in designing quantum devices at the single-photon level. 展开更多
关键词 Nonreciprocal Single Photon Frequency Conversion via Chiral coupling between a V-Type System and a Pair of waveguides
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Single Photon Scattering in a Pair of Waveguides Coupled by a Whispering-Gallery Resonator Interacting with a Semiconductor Quantum Dot 被引量:2
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作者 程木田 叶根龙 +1 位作者 纵卫卫 马小三 《Chinese Physics Letters》 SCIE CAS CSCD 2016年第2期47-50,共4页
The single photon scattering properties in a pair of waveguides coupled by a whispering-gallery resonator in- teracting with a semiconductor quantum dot are investigated theoretically. The two waveguides support four ... The single photon scattering properties in a pair of waveguides coupled by a whispering-gallery resonator in- teracting with a semiconductor quantum dot are investigated theoretically. The two waveguides support four possible ports for an incident single photon. The quantum dot is considered a V-type system. The incident direction-dependent single photon scattering properties are studied and equal-output probability from the four ports for a single photon incident is discussed. The influences of backscattering between the two modes of the whispering-gallery resonator for incident direction-dependent single photon scattering properties are also pre- sented. 展开更多
关键词 of is from in Single Photon Scattering in a Pair of waveguides Coupled by a Whispering-Gallery Resonator Interacting with a Semiconductor Quantum Dot mode with by
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Analysis and engineering of coupled cavity waveguides based on coupled-mode theory
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作者 林旭升 陈雄文 兰胜 《Chinese Physics B》 SCIE EI CAS CSCD 2005年第10期2033-2040,共8页
The analytical expression for the transmission spectra of coupled cavity waveguides (CCWs) in photonic crystals (PCs) is derived based on the coupled-mode theory (CMT). Parameters in the analytical expression ca... The analytical expression for the transmission spectra of coupled cavity waveguides (CCWs) in photonic crystals (PCs) is derived based on the coupled-mode theory (CMT). Parameters in the analytical expression can be extracted by simple numerical simulations. We reveal that it is the phase shift between the two adjacent PC defects that uniquely determines the flatness of the impurity bands of CCWs. In addition, it is found that the phase shift also greatly affects the bandwidth of CCWs. Thus, the engineering of the impurity bands of CCWs can be realized through the adjustment of the phase shift. Based on the theoretical results, an interesting phenomenon in which a CCW acts as a single PC defect and its impurity band possesses a Lorentz lineshape is predicted. Very good agreement between the analytical results and the numerical simulations based on transfer matrix method has been achieved. 展开更多
关键词 photonic crystals coupled cavity waveguides coupled-mode theory phase shift
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Preparing quantum vortex states with odd Schrdinger cat states through a coupled waveguide system
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作者 唐慧琴 李绍新 +2 位作者 朱开成 唐英 郑小娟 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第7期197-201,共5页
A scheme is proposed for preparing a quantum vortex state with a coupled waveguide, in which a single-mode odd cat state with weak intensity and a single-mode coherent state are inserted in the input ports, respective... A scheme is proposed for preparing a quantum vortex state with a coupled waveguide, in which a single-mode odd cat state with weak intensity and a single-mode coherent state are inserted in the input ports, respectively. The analytical wavefunction of the resulting state in the quadrature space is derived, and the vortex structure of the output state is analyzed. It is found that the obtained states, which may carry a vortex with topological charge index one, are entangled and nonclassical, depending only on the scaled propagation time and the weak intensity of the input odd cat state instead of the displacement parameter of the input coherent state. The phase distribution, however, in the quadrature space, depends on the displacement parameter of the input coherent state 展开更多
关键词 odd Schro¨dinger cat state quantum vortex state coupled waveguide
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A BIOSENSOR USING COUPLED PLASMON WAVEGUIDE RESONANCE COMBINED WITH HYPERSPECTRAL FLUORESCENCE ANALYSIS
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作者 CHAN DU LE LIU +4 位作者 JUN GUO YONGHONG HE JIHUA GUO SHUQING SUN HUI MA 《Journal of Innovative Optical Health Sciences》 SCIE EI CAS 2014年第1期100-108,共9页
We developed a biosensor that is capable for simultaneous surface plasmon resonance(SPR)sensing and hyperspectral fuores cence analysis in this paper.A symmetrical metal-dielectric slabscheme is employed for the excit... We developed a biosensor that is capable for simultaneous surface plasmon resonance(SPR)sensing and hyperspectral fuores cence analysis in this paper.A symmetrical metal-dielectric slabscheme is employed for the excitation of coupled plasnon waveguide resonance(CPWR)in thepresent work.Resonance bet ween surface plasmon mode and the guided waveguide mode gen-erates narrower full width half-maximum of the refective curves which leads to increased pre.cision for the determination of refractive index over conventional SPR sensors.In addition,CPWR also fers longer surface propagation depths and higher surface electric field strengthsthat enable the excitation of fluorescence with hyperspectral technique to maintain an appreci-able signal-to-noise ratio.The refractive index information obtained from SPR sensing and thechemical properties obt ained through hyperspectral fluorescence analysis confirm each other toexclude false-positive or false-negative cases.The sensor provides a comprehensive understandingof the biological events on the sensor chips. 展开更多
关键词 Coupled plasmon waveguide resonance SENSING hyperspectral fluorescence
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An Array Consisting of 10 High-Speed Side-Illuminated Evanescently Coupled Waveguide Photodetectors Each with a Bandwidth of 20 GHz
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作者 吕倩倩 叶焓 +2 位作者 尹冬冬 杨晓红 韩勤 《Chinese Physics Letters》 SCIE CAS CSCD 2015年第12期171-173,共3页
We design and fabricate a parallel system with 10 high speed side-illuminated evanescently coupled waveguide photodetectors (ECPDs). The 10 ECPDs exhibit a uniform 3dB bandwidth of 20 GHz and low dark current of abo... We design and fabricate a parallel system with 10 high speed side-illuminated evanescently coupled waveguide photodetectors (ECPDs). The 10 ECPDs exhibit a uniform 3dB bandwidth of 20 GHz and low dark current of about i nA at 2 V reverse bias. The 10 ECPDs also exhibit uniform photo-responsivity of about 0.23A/W with an active region of 5 × 25μmS. The photodetector array has a total bandwidth of more than 200 GHz and can be integrated with other optoelectronic devices. 展开更多
关键词 PD An Array Consisting of 10 High-Speed Side-Illuminated Evanescently Coupled waveguide Photodetectors Each with a Bandwidth of 20 GHz length
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A Perfect Graphene Absorber with Waveguide Coupled High-Contrast Gratings
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作者 张皓景 郑改革 +2 位作者 陈云云 邹秀娟 徐林华 《Chinese Physics Letters》 SCIE CAS CSCD 2018年第3期101-105,共5页
To achieve the enhancement and manipulation of light absorption in graphene within the visible and near infrared regions, a design consists of high-contrast gratings and two evanescently coupled slabs with graphene mo... To achieve the enhancement and manipulation of light absorption in graphene within the visible and near infrared regions, a design consists of high-contrast gratings and two evanescently coupled slabs with graphene monolayer is demonstrated. The operation principle and design process of the proposed structure are analyzed using the coupled mode theory, which is confirmed by the rigorous coupled wave analysis. It is proved that the absorptance of graphene monolayer can be greatly enhanced to unity. The thickness of grating and slab layers can significantly change the line width and resonant mode position in the absorption spectra. Furthermore, high tunability in amplitude and bandwidth of the absorption spectra can be achieved by controlling the structural parameters of the hybrid structure. The proposed devices could be efficiently exploited as tunable and selective absorbers, and could be allowed to realize other two-dimensional materials-based selective photo-detectors. 展开更多
关键词 A Perfect Graphene Absorber with waveguide Coupled High-Contrast Gratings
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A High-Sensitivity Refractive-Index Sensor Based on Plasmonic Waveguides Asymmetrically Coupled with a Nanodisk Resonator
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作者 肖丽萍 王发强 +2 位作者 梁瑞生 邹世伟 胡淼 《Chinese Physics Letters》 SCIE CAS CSCD 2015年第7期13-16,共4页
A high-sensitivity plasmonic refractive-index sensor based on the asymmetrical coupling of two metal-insulator- metal waveguides with a nanodisk resonator is proposed and simulated in the finite-difference time domain... A high-sensitivity plasmonic refractive-index sensor based on the asymmetrical coupling of two metal-insulator- metal waveguides with a nanodisk resonator is proposed and simulated in the finite-difference time domain. Both analytic and simulated results show that the resonance wavelengths of the sensor have an approximate linear relationship with the refractive index of the materials which are filled into the slit waveguides and the disk- shaped resonator. The working mechanism of this sensor is exactly due to the linear relationship, based on which tile refractive index of the materials unknown can be obtained from the detection of the resonance wavelength. The measurement sensitivity can reach as high as 6.45 × 10-7, which is nearly five times higher than the results reported in the recent literature [Opt. Commun. 300 (2013) 265]. With an optimum design, the sensing value can be further improved, and it can be widely applied into the biological sensing. Tile sensor working for temperature sensing is also analyzed. 展开更多
关键词 A High-Sensitivity Refractive-Index Sensor Based on Plasmonic waveguides Asymmetrically Coupled with a Nanodisk Resonator
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Electromagnetic coupling reduction in dual-band microstrip antenna array using ultra-compact single-negative electric metamaterials for MIMO application
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作者 Xiao-Long Fu Guo-Cheng Wu +2 位作者 Wei-Xiong Bai Guang-Ming Wang Jian-Gang Liang 《Chinese Physics B》 SCIE EI CAS CSCD 2017年第2期194-199,共6页
In this paper, an ultra-compact single negative(SNG) electric waveguided metamaterial(WG-MTM) is first investigated and used to reduce the mutual coupling in E & H planes of a dual-band microstrip antenna array. ... In this paper, an ultra-compact single negative(SNG) electric waveguided metamaterial(WG-MTM) is first investigated and used to reduce the mutual coupling in E & H planes of a dual-band microstrip antenna array. The proposed SNG electric WG-MTM unit cell is designed by etching two different symmetrical spiral lines on the ground, and has two stopbands operating at 1.86 GHz and 2.40 GHz. The circuit size is very compact, which is only λ_0/33.6 ×λ_0/15.1(where λ_0 is the wavelength at 1.86 GHz in free space). Taking advantage of the dual-stopband property of the proposed SNG electric WG-MTM, a dual-band microstrip antenna array operating at 1.86 GHz and 2.40 GHz with very low mutual coupling is designed by embedding a cross shaped array of the proposed SNG electric WG-MTM. The measured and simulated results of the designed dual-band antenna array are in good agreement with each other, indicating that the mutual coupling of the fabricated dual-band antenna array realizes 9.8/11.1 d B reductions in the H plane, 8.5/7.9 d B reductions in the E plane at1.86 GHz and 2.40 GHz, respectively. Besides, the distance of the antenna elements in the array is only 0.35 λ_0(where λ_0 is the wavelength at 1.86 GHz in free space). The proposed strategy is used for the first time to reduce the mutual coupling in E & H planes of the dual-band microstrip antenna array by using ultra-compact SNG electric WG-MTM. 展开更多
关键词 waveguided metamaterial(WG-MTM) dual-band microstrip antenna array mutual coupling reduction ultra-compact circuit size
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Design of a barcode-like waveguide nanostructure for efficient chip-fiber coupling 被引量:4
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作者 Xiang Wen Ke Xu Qinghai Song 《Photonics Research》 SCIE EI 2016年第6期209-213,共5页
A barcode-like waveguide nanostructure with discretized multilevel pixel lines is designed and optimized by a nonlinear search algorithm. We obtain the design of a one-dimensional multilevel nanostructure with-1.04 d ... A barcode-like waveguide nanostructure with discretized multilevel pixel lines is designed and optimized by a nonlinear search algorithm. We obtain the design of a one-dimensional multilevel nanostructure with-1.04 d B efficiency for surface normal coupling to a standard single-mode fiber. Another design is achieved from the automatic optimization process, which enables polarization-independent coupling to a single-mode fiber. The optimum coupling efficiency is simulated to be-2.83 dB for TE and-3.49 for TM polarization centered near the 1550 nm wavelength. Polarization-dependent loss of less than 1 dB over 45.3 nm is achieved. 展开更多
关键词 TE TM Design of a barcode-like waveguide nanostructure for efficient chip-fiber coupling
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Dispersion Properties of TIRPCF under Compton Scattering 被引量:2
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作者 HAO Dong-shan YU Ding-chen 《Semiconductor Photonics and Technology》 CAS 2006年第3期163-167,共5页
The dispersion properties in the short wavelength region of total internal reflective photonic crystal fiber(TIRPCF) in Compton scattering have been studied by using the model of the equivalent twin waveguide soliton ... The dispersion properties in the short wavelength region of total internal reflective photonic crystal fiber(TIRPCF) in Compton scattering have been studied by using the model of the equivalent twin waveguide soliton coupling, dispersion management solitons and effective refractive index. It is shown that the positive dispersion of the cladding waveguide of TIRPCF and the negative dispersion of its core waveguide are quickly increased by the square of the collision non-elastic composition between the electron and photons, and they are lessened by the increase of the electron absorption photon number. Under the one-photon nonlinear Compton scattering, the method of the compensated probing laser diffraction by the phase hole induced by the stationary pumping laser in the cladding waveguide enables the average dispersion value of TIRPCF to be close to zero, and the zero dispersion point quickly shifts to the short wavelength region. 展开更多
关键词 Equivaleht twin waveguide soliton coupling TIRPCF Multi-photon nonlinear Compton scattering Effective refractive index DISPERSION
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Coupling length variation and multi-wavelength demultiplexing in photonic crystal waveguides 被引量:3
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作者 王梓名 苏康 +6 位作者 冯波 张天华 黄维清 蔡伟成 肖威 刘鸿飞 刘建军 《Chinese Optics Letters》 SCIE EI CAS CSCD 2018年第1期48-52,共5页
In this Letter, the effects of material/structure parameters of photonic crystal(Ph C) parallel waveguides on the coupling length are investigated. The results show that, increasing the effective relative permittivi... In this Letter, the effects of material/structure parameters of photonic crystal(Ph C) parallel waveguides on the coupling length are investigated. The results show that, increasing the effective relative permittivity of the Ph C leads to a downward shift of the photonic bandgap and a variation of the coupling length. A compact Ph C 1.31/1.55 μm wavelength division multiplexer(WDM)/demultiplexer with simple structure is proposed,where the output power ratios are more than 24 d B. This WDM can multiplex/demultiplex other light waves efficiently. 展开更多
关键词 length coupling length variation and multi-wavelength demultiplexing in photonic crystal waveguides WDM Ph PBG
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Fluid Model of Waveguide Transverse Coupling
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作者 Wen Xuejin Lin BinChinese National Engineering & Technology Research Centre for Optical Instrument, State key lab of modern Optical Instrumentation, Department of Optical Engineering, Zhejiang University, Hangzhou 310027, China 《光学学报》 EI CAS CSCD 北大核心 2003年第S1期161-162,共2页
In this paper, optical fluid is firstly defined. By using the movement law of hydrodynamics, the transverse coupling of waveguides is discussed. The result fully coincides with the electromagnetic solution.
关键词 of in it on IS BE Fluid Model of waveguide Transverse coupling that
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Fabrication of EAM-Integrated DFB Lasers With A Coupling Waveguide
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作者 Hu Xiaohua, Wang Wei, Zhu Hongliang, Zhang Jingyuan, Wang Baojun,Li Baoxia, Zhou Fan, Shu Huiyun, Tian Huiliang, Bian Jing, Wang LufengNational Research Center for Optoelectronic Technology, Institute of Semiconductors,CAS, Beijing 100083, P. R. China, Tel: 86-10-82304004, Fax: 86-10-82305033, E-mail: xhhu@red.semi.ac.cn 《光学学报》 EI CAS CSCD 北大核心 2003年第S1期327-328,共2页
EAM-DFB monolithic light sources with the coupling waveguide between laser and modulator have been developed. 10mw output light power at 90mA and 18dB extinction ratio at -2V has been achieved.
关键词 DFB AS of Fabrication of EAM-Integrated DFB Lasers With A coupling waveguide EAM
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Numerical analysis of end-fire coupling of surface plasmon polaritons in a metal-insulator-metal waveguide using a simple photoplastic connector 被引量:1
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作者 YEVHENII M.MOROZOV ANATOLIY S.LAPCHUK +3 位作者 MING-LEI Fu ANDRIY A.KRYUCHYN HAO-RAN HUANG ZI-CHUN LE 《Photonics Research》 SCIE EI 2018年第3期149-156,共8页
We propose a design for efficient end-fire coupling of surface plasmon polaritons in a metal-insulator-metal(MIM) waveguide with an optical fiber as part of a simple photoplastic connector. The design was analyzed and... We propose a design for efficient end-fire coupling of surface plasmon polaritons in a metal-insulator-metal(MIM) waveguide with an optical fiber as part of a simple photoplastic connector. The design was analyzed and optimized using the three-dimensional finite-difference time-domain method. The calculated excitation efficiency coefficient of the waveguide is 83.7%(-0.77 dB) at a wavelength of 405 nm. This design enables simple connection of an optical fiber to a MIM waveguide and highly efficient local excitation of the waveguide.Moreover, the length of the metallic elements of the waveguide, and thus the dissipative losses, can be reduced.The proposed design may be useful in plasmonic-type waveguide applications such as near-field investigation of live cells and other objects with super-resolution. 展开更多
关键词 Numerical analysis of end-fire coupling of surface plasmon polaritons in a metal-insulator-metal waveguide using a simple photoplastic connector MIM
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A New Method to Measure the Coupling Efficiency of Waveguide Photodetector
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作者 Abid Karim 《光学学报》 EI CAS CSCD 北大核心 2003年第S1期525-526,共2页
In this paper, a new method is outlined for the estimation of coupling efficiency between a source laser and a WGPD. Internal quantum efficiencies as high as 72% (for 0.15μm device) and 86.5% (for 0.5μm device) are ... In this paper, a new method is outlined for the estimation of coupling efficiency between a source laser and a WGPD. Internal quantum efficiencies as high as 72% (for 0.15μm device) and 86.5% (for 0.5μm device) are achieved. 展开更多
关键词 of in as on GAAS A New Method to Measure the coupling Efficiency of waveguide Photodetector
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Ultraslow-light effects in symmetric and asymmetric waveguide structures with moon-like scatterers 被引量:1
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作者 Yong Wan Xiao-Hui Ge +2 位作者 Sheng Xu Yue Guo Feng Yuan 《Frontiers of physics》 SCIE CSCD 2017年第1期117-121,共5页
Ultraslow-light effects in two-dimensional hexagonal-lattice coupled waveguide with moon-like scat- terers were theoretically studied using the plane-wave expansion method. For symmetric structures, simulations showed... Ultraslow-light effects in two-dimensional hexagonal-lattice coupled waveguide with moon-like scat- terers were theoretically studied using the plane-wave expansion method. For symmetric structures, simulations showed that slow light with high group index can be achieved by shifting the scatterers and adjusting the radius of moon-like scatterers. The maximum group index was over 8.0 × 10^4. For asymmetric structures, simulations showed that slow light with flat band and high group index can be obtained by shifting the scatterers, adjusting the radius of moon-like scatterers, and rotating the scatterers. The maximum group index was over 5.7 ×10^5 with a "saddle-like" relationship between the frequency and group index. 展开更多
关键词 moon-like scatterer slow light coupled waveguide photonic crystal
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Controllable single-photon transport in an optical waveguide coupled to an optomechanical cavity with a V-type three-level atom 被引量:1
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作者 张玉青 朱中华 +3 位作者 彭朝晖 姜春蕾 柴一峰 谭磊 《Chinese Optics Letters》 SCIE EI CAS CSCD 2018年第1期76-80,共5页
An optomechanical cavity embedded with a V-type three-level atom is exploited to control single-photon transport in a one-dimensional waveguide. The effects of the atom–cavity detuning, the optomechanical effect,the ... An optomechanical cavity embedded with a V-type three-level atom is exploited to control single-photon transport in a one-dimensional waveguide. The effects of the atom–cavity detuning, the optomechanical effect,the coupling strengths between the cavity and the atom or the waveguide, and the atomic dissipation on the single-photon transport properties are analyzed systematically. Interestingly, the single-photon transmission spectra show multiple double electromagnetically induced transparency. Moreover, the double electromagnetically induced transparency can be switched to a single one by tuning the atom–cavity detuning. 展开更多
关键词 EIT Controllable single-photon transport in an optical waveguide coupled to an optomechanical cavity with a V-type three-level atom
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parametric process quadratic waveguide array EPR state
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作者 杨莹 徐平 +1 位作者 陆亮亮 祝世宁 《Communications in Theoretical Physics》 SCIE CAS CSCD 2016年第2期219-224,共6页
We propose the generation of photonic EPR state from quadratic waveguide array. Both the propagation constant and the nonlinearity in the array are designed to possess a periodical modulation along the propagation dir... We propose the generation of photonic EPR state from quadratic waveguide array. Both the propagation constant and the nonlinearity in the array are designed to possess a periodical modulation along the propagation direction.This ensures that the photon pairs can be generated efficiently through the quasi-phase-matching spontaneous parametric down conversion by holding the spatial EPR entanglement in the fashion of correlated position and anticorrelated momentum. The Schmidt number which denotes the degree of EPR entanglement is calculated and it can approach a high value when the number of illuminated waveguide channels and the length of the waveguide array are properly chosen. These results suggest the quadratic waveguide array as a compact platform for engineering photonic quantum states in a high-dimensional Hilbert space. 展开更多
关键词 Photonic EPR State from Quadratic waveguide Array with Alternating Positive and Negative couplings
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