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Nonlinear optical rectification of GaAs/Ga_(1-x)Al_(x)As quantum dots with Hulthén plus Hellmann confining potential
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作者 段一名 李学超 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第1期454-457,共4页
We investigate the nonlinear optical rectification(NOR) of spherical quantum dots(QDs) under Hulthén plus Hellmann confining potential with the external tuning elements. Energy and wavefunction are determined by ... We investigate the nonlinear optical rectification(NOR) of spherical quantum dots(QDs) under Hulthén plus Hellmann confining potential with the external tuning elements. Energy and wavefunction are determined by using the Nikiforov–Uvarov method. Expression for the NOR coefficient is derived by the density matrix theory. The results show that the applied external elements and internal parameters of this system have a strong influence on intraband nonlinear optical properties. It is hopeful that this tuning of the nonlinear optical properties of GaAs/Ga_(1-x)Al_(x)As QDs can make a greater contribution to preparation of new functional optical devices. 展开更多
关键词 nonlinear optical rectification quantum dots Hulthén plus Hellmann potential Nikiforov–Uvarov method
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Optical Rectification Induced by Al-Si Schottky Barrier Potential and Mechanism of Two-Photon Response
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作者 刘云龙 贾刚 +3 位作者 周志雄 陈占国 张晓婷 李海兰 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2002年第8期805-808,共4页
By observing two-photon response and anisotropy of the light-induced voltage in Al-Si Schottky barrier potential,it is certified from the experimental and theoretical analysis that the built-in electric field generate... By observing two-photon response and anisotropy of the light-induced voltage in Al-Si Schottky barrier potential,it is certified from the experimental and theoretical analysis that the built-in electric field generated by the Schottky barrier potential will induce the phenomena of optical rectification in Si photodiode.Thus,it is deduced that there must be double-frequency absorption caused by phase-mismatch in the mechanism of two-photon response of Si photodiode.If the intensity of the built-in electric field is strong enough,the double-frequency absorption will be the main factor of the two-photon response,which is different from the conventional opinion that the two-photon response is just the two-photon absorption. 展开更多
关键词 optical rectification double-frequency two-photon absorption
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Polaron effect on the optical rectification in spherical quantum dots with electric field 被引量:5
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作者 冯振宇 闫祖威 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第10期446-451,共6页
The polaron effect on the optical rectification in spherical quantum dots with a shallow hydrogenic impurity in the presence of electric field is theoretically investigated by taking into account the interactions of t... The polaron effect on the optical rectification in spherical quantum dots with a shallow hydrogenic impurity in the presence of electric field is theoretically investigated by taking into account the interactions of the electrons with both confined and surface optical phonons. Besides, the interaction between impurity and phonons is also considered. Numerical calculations are presented for typical Zn1-xCdxSe/ZnSe material. It is found that the polaronic effect or electric field leads to the redshifted resonant peaks of the optical rectification coefficients. It is also found that the peak values of the optical rectification coefficients with the polaronic effect are larger than without the polaronic effect, especially for smaller Cd concentrations or stronger electric field. 展开更多
关键词 polaron effect optical rectification spherical quantum dot
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Optical rectification in 4H-SiC:paving the way to generate strong terahertz fields with ultra-wide bandwidth
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作者 Fangjie Li Kai Zhong +6 位作者 Yiwen Zhang Tong Wu Yuxin Liu Hongzhan Qiao Jining Li Degang Xu Jianquan Yao 《High Power Laser Science and Engineering》 SCIE CAS CSCD 2023年第5期115-126,共12页
The 4H-SiC crystal is found to have great potential in terahertz generation via nonlinear optical frequency conversion due to its extremely high optical damage threshold,wide transparent range,etc.In this paper,optica... The 4H-SiC crystal is found to have great potential in terahertz generation via nonlinear optical frequency conversion due to its extremely high optical damage threshold,wide transparent range,etc.In this paper,optical rectification(OR)with tilted-pulse-front(TPF)setting based on the 4H-SiC crystal is proposed.The theory accounts for the optimization of incident pulse pre-chirping in the TPF OR process under high-intensity femtosecond laser pumping.Compared with the currently recognized LiNbO3-based TPF OR,which generates a single-cycle terahertz pulse within 3 THz,4HSiC demonstrates a significant advantage in producing ultra-widely tunable(up to over 14 THz,TPF angle 31◦–38◦)terahertz waves with high efficiency(~10–2)and strong field(~MV/cm).Besides,the spectrum characteristics,as well as the evolution from single-to multi-cycle terahertz pulses can be modulated flexibly by pre-chirping.The simulation results show that 4H-SiC enables terahertz frequency extending to an unprecedent range by OR,which has extremely important potential in strong-field terahertz applications. 展开更多
关键词 optical rectification silicon carbide terahertz radiation tilted-pulse-front
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Spherical quantum dot in modified Kratzer-Coulomb potential:study of optical rectification coefficients
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作者 Xuechao Li Ceng Chang Yongrui Ma 《Communications in Theoretical Physics》 SCIE CAS CSCD 2022年第6期179-183,共5页
We consider the effects of quantum dot radius,confinement potential depth and controllable effective mass on the optical rectification coefficient(ORC)in spherical quantum dots,which is confined with Modified Kratzer-... We consider the effects of quantum dot radius,confinement potential depth and controllable effective mass on the optical rectification coefficient(ORC)in spherical quantum dots,which is confined with Modified Kratzer-Coulomb Potential(MKCP).Using the Nikiforov-Uvarov method and compact density matrix theory,the ground state energy,ORC and wave function of electrons under the combined action of many factors are calculated.The results show that they affect the optical rectification response from different angles,including the position of peak and formant. 展开更多
关键词 modified Kratzer-Coulomb potential Nikiforov-Uvarov method nonlinear optical properties optical rectification coefficient
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Second-harmonic generation in asymmetric quantum dots in the presence of a static magnetic field 被引量:1
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作者 李学超 王安民 +1 位作者 王兆亮 杨阳 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第8期449-452,共4页
The second-harmonic generation (SHG) coefficient in an asymmetric quantum dot (QD) with a static magnetic field is theoretically investigated. Within the framework of the effective-mass approximation, we obtain th... The second-harmonic generation (SHG) coefficient in an asymmetric quantum dot (QD) with a static magnetic field is theoretically investigated. Within the framework of the effective-mass approximation, we obtain the confined wave functions and energies of electrons in the QD. We also obtain the SHC coefficient by the compact-density-matrix approach and the iterative method. The numerical results for the typical GaAs/AlGaAs QD show that the SHC coefficient depends strongly on the magnitude of magnetic field, parameters of the asymmetric potential and the radius of the QD. The resonant peak shifts with the magnetic field or the radius of the QD changing. 展开更多
关键词 quantum dot nonlinear optical rectification magnetic field
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Choice of optimal crystal-orientation for terahertz transceiver with zincblende crystal
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作者 田晓光 凌福日 +2 位作者 何健 刘劲松 姚建铨 《Chinese Physics B》 SCIE EI CAS CSCD 2011年第12期238-243,共6页
This paper presents a set of equations describing the terahertz generation and electro-optic detection based on optical rectification in zincblende crystals. The dependence of terahertz emission efficiency on the pola... This paper presents a set of equations describing the terahertz generation and electro-optic detection based on optical rectification in zincblende crystals. The dependence of terahertz emission efficiency on the polarization of incident beam and crystal-orientation is discussed. For the experimental setup with a transceiver which transmits and detects terahertz radiation in the same crystal, we have demonstrated the optimal combination of both parameters above to optimize the working efficiency. Equations supplied in this paper are valid for zincblende crystals with arbitrary crystal- orientation and every possible polarization of an incident beam, which are of great significance for the optimization of a system. 展开更多
关键词 terahertz transceiver optical rectification electro-optic detection optimal orientation
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Optically pumped terahertz sources 被引量:11
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作者 ZHONG Kai SHI Wei +6 位作者 XU DeGang LIU PengXiang WANG YuYe MEI JiaLin YAN Chao FU ShiJie YAO JianQuan 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2017年第12期1801-1818,共18页
High-power terahertz(THz) generation in the frequency range of 0.1-10 THz has been a fast-developing research area ever since the beginning of the THz boom two decades ago, enabling new technological breakthroughs in ... High-power terahertz(THz) generation in the frequency range of 0.1-10 THz has been a fast-developing research area ever since the beginning of the THz boom two decades ago, enabling new technological breakthroughs in spectroscopy, communication, imaging,etc. By using optical(laser) pumping methods with near-or mid-infrared(IR) lasers, flexible and practical THz sources covering the whole THz range can be realized to overcome the shortage of electronic THz sources and now they are playing important roles in THz science and technology. This paper overviews various optically pumped THz sources, including femtosecond laser based ultrafast broadband THz generation, monochromatic widely tunable THz generation, single-mode on-chip THz source from photomixing, and the traditional powerful THz gas lasers. Full descriptions from basic principles to the latest progress are presented and their advantages and disadvantages are discussed as well. It is expected that this review gives a comprehensive reference to researchers in this area and additionally helps newcomers to quickly gain understanding of optically pumped THz sources. 展开更多
关键词 terahertz(THz) wave photoconductive switch optical rectification difference frequency generation(DFG) terahertz parametric oscillator(TPO) PHOTOMIXING THz gas lasers phase matching(PM)
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