The photonic spin Hall effect(PSHE),characterized by two splitting beams with opposite spins,has great potential applications in nano-photonic devices,optical sensing fields,and precision metrology.We present the sign...The photonic spin Hall effect(PSHE),characterized by two splitting beams with opposite spins,has great potential applications in nano-photonic devices,optical sensing fields,and precision metrology.We present the significant enhancement of terahertz(THz)PSHE by taking advantage of the optical Tamm state(OTS)in In Sb-distributed Bragg reflector(DBR)structure.The spin shift of reflected light can be dynamically tuned by the structural parameters(e.g.the thickness)of the InSb-DBR structure as well as the temperature,and the maximum spin shift for a horizontally polarized incident beam at 1.1 THz can reach up to 11.15 mm.Moreover,we propose a THz gas sensing device based on the enhanced PSHE via the strong excitation of OTS for the InSb-DBR structure with a superior intensity sensitivity of 5.873×10^(4)mm/RIU and good stability.This sensor exhibits two orders of magnitude improvement compared with the similar PSHE sensor based on In Sb-supported THz long-range surface plasmon resonance.These findings may provide an alternative way for the enhanced PSHE and offer the opportunity for developing new optical sensing devices.展开更多
A new type of cavity polariton,the optical Tamm state（OTS） polariton,is proposed to be realized by sandwiching a quantum well（QW） between a gold layer and a distributed Bragg reflector（DBR）.It is shown that OTS ...A new type of cavity polariton,the optical Tamm state（OTS） polariton,is proposed to be realized by sandwiching a quantum well（QW） between a gold layer and a distributed Bragg reflector（DBR）.It is shown that OTS polaritons can be generated from the strong couplings between the QW excitons and the free OTSs.In addition,if a second gold layer is introduced into the bottom of the DBR,two independent free OTSs can interact strongly with the QW excitons to produce extra OTS polaritons.展开更多
We present the perfect light absorption of monolayer molybdenum disulfide(MoS_(2))in a dielectric multilayer system with two different Bragg mirrors.The results show that the strong absorption of visible light in mono...We present the perfect light absorption of monolayer molybdenum disulfide(MoS_(2))in a dielectric multilayer system with two different Bragg mirrors.The results show that the strong absorption of visible light in monolayer MoS_(2) is attributed to the formation of optical Tamm states(OTSs)between two Bragg mirrors.The MoS_(2) absorption spectrum is dependent on the layer thickness of Bragg mirrors,incident angle of light,and the period numbers of Bragg mirrors.Especially,the nearly perfect light absorption(99.4%)of monolayer MoS_(2) can be achieved by choosing proper period numbers,which is well analyzed by the temporal coupled-mode theory.展开更多
提出了一种基于光学tamm态(OTS)的声光开关方案.该声光开关利用一维光子晶体异质结的OTS以及声光效应,改变超声波振幅使得OTS的本征波长向短波方向发生漂移,从而实现通断功能.考虑了在一维光子晶体异质结中的声光效应,建立了这种声光开...提出了一种基于光学tamm态(OTS)的声光开关方案.该声光开关利用一维光子晶体异质结的OTS以及声光效应,改变超声波振幅使得OTS的本征波长向短波方向发生漂移,从而实现通断功能.考虑了在一维光子晶体异质结中的声光效应,建立了这种声光开关的理论模型,利用COMSOL软件进行仿真研究.研究结果表明,通过是否施加一定振幅的超声波,在1548.8-1551.7 nm波长范围内可实现消光比最低可达12 d B、插入损耗最高仅为0.97 d B的声光开关;也可通过是否施加与入射光波长相应振幅的超声波,实现1536.6-1543.3 nm波长范围内消光比最低可达12 d B,插入损耗最高仅为0.99 d B的声光开关.该声光开关的响应时间不超过13 ns,具有消光比高且插入损耗低的特点,在光通信领域具有良好的应用前景.展开更多
We propose magnetized gyromagnetic photonic crystals(MGPCs)composed of indium antimonide(InSb)and yttrium iron garnet ferrite(YIGF)layers,which possess the properties of nonreciprocal wide-angle bidirectional absorpti...We propose magnetized gyromagnetic photonic crystals(MGPCs)composed of indium antimonide(InSb)and yttrium iron garnet ferrite(YIGF)layers,which possess the properties of nonreciprocal wide-angle bidirectional absorption.Periodical defects in the MGPCs work as filters.Absorption bands(ABs)for the positive and negative propagations arise from the optical Tamm state and resonance in cavities respectively,and they prove to share no overlaps in the studied frequency range.Givenω=2.0138 THz,for the positive propagation,the ABs in the high-frequency range are localized in the interval between 0.66ωand 0.88ω.In the angular range,the ABs for the TE and TM waves reach 60°and 51°,separately.For the negative propagation,the ABs in the low-frequency range are localized in the interval between 0.13ωand 0.3ω.The AB s extend to 60°for the TE waves and 80.4°for the TM waves.There also exists a narrow frequency band in a lower frequency range.The relevant factors,which include the external temperature,the magnetic fields applied to the YIGF,the refractive index of the impedance matching layer,and the defect thickness,are adjusted to investigate the effects on the ABs.All the numerical simulations are based on the transfer matrix method.This work provides an approach to designs of isolators and so on.展开更多
基金Project supported by the National Natural Science Foundation of China(Grant Nos.12175107 and 12004194)the Natural Science Foundation of Nanjing University of Posts and Telecommunications(Grant No.NY220030)
文摘The photonic spin Hall effect(PSHE),characterized by two splitting beams with opposite spins,has great potential applications in nano-photonic devices,optical sensing fields,and precision metrology.We present the significant enhancement of terahertz(THz)PSHE by taking advantage of the optical Tamm state(OTS)in In Sb-distributed Bragg reflector(DBR)structure.The spin shift of reflected light can be dynamically tuned by the structural parameters(e.g.the thickness)of the InSb-DBR structure as well as the temperature,and the maximum spin shift for a horizontally polarized incident beam at 1.1 THz can reach up to 11.15 mm.Moreover,we propose a THz gas sensing device based on the enhanced PSHE via the strong excitation of OTS for the InSb-DBR structure with a superior intensity sensitivity of 5.873×10^(4)mm/RIU and good stability.This sensor exhibits two orders of magnitude improvement compared with the similar PSHE sensor based on In Sb-supported THz long-range surface plasmon resonance.These findings may provide an alternative way for the enhanced PSHE and offer the opportunity for developing new optical sensing devices.
基金Project supported by the Young Scientists Fund of the National Natural Science Foundation of China (Grant No. 61106045)
文摘A new type of cavity polariton,the optical Tamm state（OTS） polariton,is proposed to be realized by sandwiching a quantum well（QW） between a gold layer and a distributed Bragg reflector（DBR）.It is shown that OTS polaritons can be generated from the strong couplings between the QW excitons and the free OTSs.In addition,if a second gold layer is introduced into the bottom of the DBR,two independent free OTSs can interact strongly with the QW excitons to produce extra OTS polaritons.
基金supported by the National Key R&D Program of China(No.2017YFA0303800)the National Natural Science Foundation of China(Nos.11774290,11974283,61705186,and 11634010)the Natural Science Basic Research Plan in Shaanxi Province of China(No.2020JM-130)。
文摘We present the perfect light absorption of monolayer molybdenum disulfide(MoS_(2))in a dielectric multilayer system with two different Bragg mirrors.The results show that the strong absorption of visible light in monolayer MoS_(2) is attributed to the formation of optical Tamm states(OTSs)between two Bragg mirrors.The MoS_(2) absorption spectrum is dependent on the layer thickness of Bragg mirrors,incident angle of light,and the period numbers of Bragg mirrors.Especially,the nearly perfect light absorption(99.4%)of monolayer MoS_(2) can be achieved by choosing proper period numbers,which is well analyzed by the temporal coupled-mode theory.
文摘提出了一种基于光学tamm态(OTS)的声光开关方案.该声光开关利用一维光子晶体异质结的OTS以及声光效应,改变超声波振幅使得OTS的本征波长向短波方向发生漂移,从而实现通断功能.考虑了在一维光子晶体异质结中的声光效应,建立了这种声光开关的理论模型,利用COMSOL软件进行仿真研究.研究结果表明,通过是否施加一定振幅的超声波,在1548.8-1551.7 nm波长范围内可实现消光比最低可达12 d B、插入损耗最高仅为0.97 d B的声光开关;也可通过是否施加与入射光波长相应振幅的超声波,实现1536.6-1543.3 nm波长范围内消光比最低可达12 d B,插入损耗最高仅为0.99 d B的声光开关.该声光开关的响应时间不超过13 ns,具有消光比高且插入损耗低的特点,在光通信领域具有良好的应用前景.
基金Project supported by the College Student Innovation Training Program of Nanjing University of Posts and Telecommunicationsthe Jiangsu Agriculture Science and Technology Innovation Fund(JASTIF)(Grant No.CX(21)3187)。
文摘We propose magnetized gyromagnetic photonic crystals(MGPCs)composed of indium antimonide(InSb)and yttrium iron garnet ferrite(YIGF)layers,which possess the properties of nonreciprocal wide-angle bidirectional absorption.Periodical defects in the MGPCs work as filters.Absorption bands(ABs)for the positive and negative propagations arise from the optical Tamm state and resonance in cavities respectively,and they prove to share no overlaps in the studied frequency range.Givenω=2.0138 THz,for the positive propagation,the ABs in the high-frequency range are localized in the interval between 0.66ωand 0.88ω.In the angular range,the ABs for the TE and TM waves reach 60°and 51°,separately.For the negative propagation,the ABs in the low-frequency range are localized in the interval between 0.13ωand 0.3ω.The AB s extend to 60°for the TE waves and 80.4°for the TM waves.There also exists a narrow frequency band in a lower frequency range.The relevant factors,which include the external temperature,the magnetic fields applied to the YIGF,the refractive index of the impedance matching layer,and the defect thickness,are adjusted to investigate the effects on the ABs.All the numerical simulations are based on the transfer matrix method.This work provides an approach to designs of isolators and so on.
