Two types of one-dimensional(1D)anti-PT-symmetric periodic ring optical waveguide networks,consisting of gain and loss materials,are constructed.The singular optical propagation properties of these networks are invest...Two types of one-dimensional(1D)anti-PT-symmetric periodic ring optical waveguide networks,consisting of gain and loss materials,are constructed.The singular optical propagation properties of these networks are investigated.The results show that the system composed of gain materials exhibits characteristics of ultra-strong transmission and bidirectional reflection.Conversely,the system composed of loss materials demonstrates equal transmittance and reflectance at some frequencies.In both the systems,a new type of total reflection phenomenon is observed.When the imaginary part of the refractive indices of waveguide segments is smaller than 10-5,the system shows bidirectional transparency with the transmittance tending to be 1 and reflectivity to be smaller than 10-8 at some bands.When the refractive indices of the waveguide segments are real,the system will be bidirectional transparent at the full band.These findings may deepen the understanding of anti-PT-symmetric optical systems and optical waveguide networks,and possess potential applications in efficient optical energy storage,ultra-sensitive optical filters,ultra-sensitive all-optical switches,integrated optical chips,stealth physics,and so on.展开更多
The propagation dynamics of the Airy Gaussian vortex beams in uniaxial crystals orthogonal to the optical axis has been investigated analytically and numerically. The propagation expression of the beams has been obtai...The propagation dynamics of the Airy Gaussian vortex beams in uniaxial crystals orthogonal to the optical axis has been investigated analytically and numerically. The propagation expression of the beams has been obtained. The propagation features of the Airy Gaussian vortex beams are shown with changes of the distribution factor and the ratio of the extraordinary refractive index to the ordinary refractive index. The correlations between the ratio and the maximum intensity value during the propagation, and its appearing distance have been investigated.展开更多
By its unparalleled capacity to manipulate optical parameters,metasurfaces demonstrate the ability to simultaneously manipulate the amplitude and phase of incident light.Exhibiting both near-field nanoprinting images ...By its unparalleled capacity to manipulate optical parameters,metasurfaces demonstrate the ability to simultaneously manipulate the amplitude and phase of incident light.Exhibiting both near-field nanoprinting images and far-field holography images is a quintessential illustration of this capability.In preceding investigations,image multiplexing commonly transpires within the single polarization state or orthogonal polarization states,thereby exhibiting a deficiency in terms of information security when contrasted with the nonorthogonal polarization states.In this research,a multifunctional metasurface with the capability of exhibiting four-channel images has been proposed by using a nanobrick as a quarter-wave plate.Through the adjustment of the orientation angles of each nanobrick,nanoprinting can be displayed under both linearly and circularly polarized light.Building on this,the propagation phase is combined with the geometric phase to generate diverse phase delays,enabling the metasurface to be multiplexed under two nonorthogonal polarization states to achieve four-channel image displays.Intriguingly,bidirectional nanoprinting and bidirectional holography can be achieved by altering the direction of incidence polarization states.The proposed metasurface platform can open new possibilities for creating compact multifunctional optical devices,while also enhancing applications in multichannel image displays,information anticounterfeiting,and encryption.展开更多
通过理论和实证分析可以发现,投资波动将会导致生产资料价格的变动、消费需求的变动、粮食供给的变动并加大对国际市场的依赖,最终传导到消费品市场引起CPI的波动。因此要保持C P I稳定就必须要熨平投资波动、促进投资持续稳定增长并提...通过理论和实证分析可以发现,投资波动将会导致生产资料价格的变动、消费需求的变动、粮食供给的变动并加大对国际市场的依赖,最终传导到消费品市场引起CPI的波动。因此要保持C P I稳定就必须要熨平投资波动、促进投资持续稳定增长并提高投资质量。展开更多
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11674107,61475049,11775083,61774062,and 61771205).
文摘Two types of one-dimensional(1D)anti-PT-symmetric periodic ring optical waveguide networks,consisting of gain and loss materials,are constructed.The singular optical propagation properties of these networks are investigated.The results show that the system composed of gain materials exhibits characteristics of ultra-strong transmission and bidirectional reflection.Conversely,the system composed of loss materials demonstrates equal transmittance and reflectance at some frequencies.In both the systems,a new type of total reflection phenomenon is observed.When the imaginary part of the refractive indices of waveguide segments is smaller than 10-5,the system shows bidirectional transparency with the transmittance tending to be 1 and reflectivity to be smaller than 10-8 at some bands.When the refractive indices of the waveguide segments are real,the system will be bidirectional transparent at the full band.These findings may deepen the understanding of anti-PT-symmetric optical systems and optical waveguide networks,and possess potential applications in efficient optical energy storage,ultra-sensitive optical filters,ultra-sensitive all-optical switches,integrated optical chips,stealth physics,and so on.
基金supported by the National Natural Science Foundation of China(Grant Nos.11374108,11374107,10904041,and 11547212)the Foundation of Cultivating Outstanding Young Scholars of Guangdong Province,China+2 种基金the CAS Key Laboratory of Geospace Environment,University of Science and Technology of Chinathe National Training Program of Innovation and Entrepreneurship for Undergraduates(Grant No.2015093)the Science and Technology Projects of Guangdong Province,China(Grant No.2013B031800011)
文摘The propagation dynamics of the Airy Gaussian vortex beams in uniaxial crystals orthogonal to the optical axis has been investigated analytically and numerically. The propagation expression of the beams has been obtained. The propagation features of the Airy Gaussian vortex beams are shown with changes of the distribution factor and the ratio of the extraordinary refractive index to the ordinary refractive index. The correlations between the ratio and the maximum intensity value during the propagation, and its appearing distance have been investigated.
基金supported by the National Natural Science Foundation of China (NSFC) (Nos.62175070 and 61774062)the Natural Science Foundation of Guangdong Province (No.2021A1515010352)the Science and Technology Program of Guangzhou (No.2019050001)。
文摘By its unparalleled capacity to manipulate optical parameters,metasurfaces demonstrate the ability to simultaneously manipulate the amplitude and phase of incident light.Exhibiting both near-field nanoprinting images and far-field holography images is a quintessential illustration of this capability.In preceding investigations,image multiplexing commonly transpires within the single polarization state or orthogonal polarization states,thereby exhibiting a deficiency in terms of information security when contrasted with the nonorthogonal polarization states.In this research,a multifunctional metasurface with the capability of exhibiting four-channel images has been proposed by using a nanobrick as a quarter-wave plate.Through the adjustment of the orientation angles of each nanobrick,nanoprinting can be displayed under both linearly and circularly polarized light.Building on this,the propagation phase is combined with the geometric phase to generate diverse phase delays,enabling the metasurface to be multiplexed under two nonorthogonal polarization states to achieve four-channel image displays.Intriguingly,bidirectional nanoprinting and bidirectional holography can be achieved by altering the direction of incidence polarization states.The proposed metasurface platform can open new possibilities for creating compact multifunctional optical devices,while also enhancing applications in multichannel image displays,information anticounterfeiting,and encryption.
