We use Hypergeometric Gaussian-II(HyGG-II)modes to investigate the impacts of non-Kolmogorov atmospheric turbulence on the Holevo channel capacity of a quantum communication scheme.The capacity of HyGG-II modes can be...We use Hypergeometric Gaussian-II(HyGG-II)modes to investigate the impacts of non-Kolmogorov atmospheric turbulence on the Holevo channel capacity of a quantum communication scheme.The capacity of HyGG-II modes can be higher than that of Laguerre-Gaussian modes via modulating the hollowness parameter.The influences of low-order turbulence aberrations including tilt,defocus,astigmatism,and coma on the capacity are also explored.Generally,tilt aberration dominates among all low-order aberrations and defocus and astigmatism aberrations are always negligible.By contrast,the effect of coma aberration can be enhanced to be non-negligible when the turbulence strength or the channel zenith angle is enhanced.We also show that only the total and tilt aberrations are sensitive to the non-Kolmogorov power-law exponent.Our results may contribute to the quantum optical communication as well as aberration compensation in turbulent channels utilizing the novel family of vortex beams.展开更多
Electromagnetic metasurfaces exhibit considerable potential for generating high-purity vortex beams and enabling high-resolution imaging and information encryption.However,traditional GHz devices face challenges,inclu...Electromagnetic metasurfaces exhibit considerable potential for generating high-purity vortex beams and enabling high-resolution imaging and information encryption.However,traditional GHz devices face challenges,including reduced efficiency due to bulky size and material losses.Herein,we designed a multilayer structure and demonstrated through simulations that this configuration served as an efficient transmissive meta-atom.We designed arrays in multiple sizes and finally determined that the optimal minimal unit was the meta-quaternion vortex array,which was subsequently used as the pixel basis for the target image.A digitally patterned GHz metadevice was fabricated and experimentally characterized with right-handed circularly polarized(RCP)light.The experimental results were in excellent agreement with the simulations.We combined the classical nine-grid encryption method(Luoshu)with metasurfaces and introduced the weighted superposition computation technique(WeightLock)to achieve multilayer encryption of target characters.Our research offered novel strategies for the next-generation 5G/6G communication systems,radar detection,and information encryption fields,demonstrating broad application prospects in intelligent communication and advanced radar technologies.展开更多
Topological edge states have an important role in optical modulation with potential applications in wavelength division multiplexers(WDMs).In this paper,2D photonic crystals(PCs)with different rotation angles are comb...Topological edge states have an important role in optical modulation with potential applications in wavelength division multiplexers(WDMs).In this paper,2D photonic crystals(PCs)with different rotation angles are combined to generate topological edge states.We reveal the relationship between the edge states and the rotation parameters of PCs,and further propose a WDM to realize the application of adjustable beams.Our findings successfully reveal the channel selectivity for optical transmission and provide a flexible way to promote the development of topological photonic devices.展开更多
Electromagnetic metasurfaces have important applications in vortex beam generation and steering,which enables great potential in secure communication,imaging systems,and quantum technologies.Conventional geometric ph ...Electromagnetic metasurfaces have important applications in vortex beam generation and steering,which enables great potential in secure communication,imaging systems,and quantum technologies.Conventional geometric ph ase-based metasurfaces lack the ability to control two spins simultaneously.In this paper,we designed a set of meta-atoms with appropriate geometric dimensions and orientation angles to achieve complete spin decoupling.Metasurfaces engineered by geometric phase and propagating phase can produce various vortex beams with distinct topological charges when illuminated by right-handed circular polarization and left-handed circular polarization.The experiments are conducted to assess the near-field and far-field efficacy of vortex beams.The experimental findings align well with the theoretical predictions.This study provides novel techniques for the arbitrary generation of high-performance vortex beams generated by metasurfaces within the microwave domain,which can be widely used in information encryption and 5G/6G wireless communication systems,facili-tating advancements in high-performance wireless encrypted communication systems.展开更多
基金Project supported by the National Key Research and Development Program of China(Grant No.2022YFE0122300)the National Natural Science Foundation of China(Grant Nos.61871202 and 11811530052)
文摘We use Hypergeometric Gaussian-II(HyGG-II)modes to investigate the impacts of non-Kolmogorov atmospheric turbulence on the Holevo channel capacity of a quantum communication scheme.The capacity of HyGG-II modes can be higher than that of Laguerre-Gaussian modes via modulating the hollowness parameter.The influences of low-order turbulence aberrations including tilt,defocus,astigmatism,and coma on the capacity are also explored.Generally,tilt aberration dominates among all low-order aberrations and defocus and astigmatism aberrations are always negligible.By contrast,the effect of coma aberration can be enhanced to be non-negligible when the turbulence strength or the channel zenith angle is enhanced.We also show that only the total and tilt aberrations are sensitive to the non-Kolmogorov power-law exponent.Our results may contribute to the quantum optical communication as well as aberration compensation in turbulent channels utilizing the novel family of vortex beams.
基金National Key Research and Development Program of China(2024YFE107800)National Natural Science Foundation of China(62205127)+1 种基金Basic Research Program of Jiangsu(BK20231493)Key Laboratory of Advanced Optical Manufacturing Technologies of Jiangsu Province(KJS2272)。
文摘Electromagnetic metasurfaces exhibit considerable potential for generating high-purity vortex beams and enabling high-resolution imaging and information encryption.However,traditional GHz devices face challenges,including reduced efficiency due to bulky size and material losses.Herein,we designed a multilayer structure and demonstrated through simulations that this configuration served as an efficient transmissive meta-atom.We designed arrays in multiple sizes and finally determined that the optimal minimal unit was the meta-quaternion vortex array,which was subsequently used as the pixel basis for the target image.A digitally patterned GHz metadevice was fabricated and experimentally characterized with right-handed circularly polarized(RCP)light.The experimental results were in excellent agreement with the simulations.We combined the classical nine-grid encryption method(Luoshu)with metasurfaces and introduced the weighted superposition computation technique(WeightLock)to achieve multilayer encryption of target characters.Our research offered novel strategies for the next-generation 5G/6G communication systems,radar detection,and information encryption fields,demonstrating broad application prospects in intelligent communication and advanced radar technologies.
基金National Key Research and Development Program of China(2022YFE0122300)National Natural Science Foundation of China(11811530052,12004425,1211101294,62105126)+2 种基金State Key Laboratory of Millimeter Waves(K202105,K202238)Intergovernmental Science and Technology Regular Meeting Exchange Project of Ministry of Science and Technology of China(CB02-20)Natural Science Foundation of Jiangsu Province(BK20200630)。
文摘Topological edge states have an important role in optical modulation with potential applications in wavelength division multiplexers(WDMs).In this paper,2D photonic crystals(PCs)with different rotation angles are combined to generate topological edge states.We reveal the relationship between the edge states and the rotation parameters of PCs,and further propose a WDM to realize the application of adjustable beams.Our findings successfully reveal the channel selectivity for optical transmission and provide a flexible way to promote the development of topological photonic devices.
基金National Key Research and Development Program of China(2024YFE107800)National Natural Science Foundation of China(62205127)+1 种基金Basic Research Program of Jiangsu(BK20231493)Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province(KJS2272).
文摘Electromagnetic metasurfaces have important applications in vortex beam generation and steering,which enables great potential in secure communication,imaging systems,and quantum technologies.Conventional geometric ph ase-based metasurfaces lack the ability to control two spins simultaneously.In this paper,we designed a set of meta-atoms with appropriate geometric dimensions and orientation angles to achieve complete spin decoupling.Metasurfaces engineered by geometric phase and propagating phase can produce various vortex beams with distinct topological charges when illuminated by right-handed circular polarization and left-handed circular polarization.The experiments are conducted to assess the near-field and far-field efficacy of vortex beams.The experimental findings align well with the theoretical predictions.This study provides novel techniques for the arbitrary generation of high-performance vortex beams generated by metasurfaces within the microwave domain,which can be widely used in information encryption and 5G/6G wireless communication systems,facili-tating advancements in high-performance wireless encrypted communication systems.
