A novel polarizer with a silver nanoribbon added into a traditional waveguide directional coupler is designed to realize the polarized output of TE mode.A high extinction ratio can be obtained because of the selectivi...A novel polarizer with a silver nanoribbon added into a traditional waveguide directional coupler is designed to realize the polarized output of TE mode.A high extinction ratio can be obtained because of the selectivity of surface plasmon polaritons(SPPs)on polarization.The effects of the polarizer parameters on coupling efficiency and extinction ratio are discussed.Simulation results indicate that the coupling efficiency for TE mode can reach about 95%,but only 3% for TM mode,with the extinction ratio of TE mode about 15 dB when the light wavelength is 1550 nm.The polarizer may have potential applications in photonic integrated circuits and quantum information technology.展开更多
For speckle-correlation-based scattering imaging,an iris is generally used next to the diffuser to magnify the speckle size and enhance the speckle contrast,which limits the light flux and makes the setup cooperative....For speckle-correlation-based scattering imaging,an iris is generally used next to the diffuser to magnify the speckle size and enhance the speckle contrast,which limits the light flux and makes the setup cooperative.Here,we experimentally demonstrate a non-iris speckle-correlation imaging method associated with an image resizing process.The experimental results demonstrate that,by estimating an appropriate resizing factor,our method can achieve high-fidelity noncooperative speckle-correlation imaging by digital resizing of the raw captions or on-chip pixel binning without iris.The method opens a new door for noncooperative high-frame-rate speckle-correlation imaging and benefits scattering imaging for dynamic objects hidden behind opaque barriers.展开更多
基金The National Natural Science Foundation of China(Nos.61070040,61108089,61205087,61107005and 51302316)the Hunan Provincial Natural Science Foundation of China(No.13JJ4003)the Advanced Research Foundation of National University of Defense Technology(No.JC13-02-09)
基金supported by the National Natural Science Foundation of China(Nos.60907003,61070040 and 61107005)the Program for New Century Excellent Talents in University
文摘A novel polarizer with a silver nanoribbon added into a traditional waveguide directional coupler is designed to realize the polarized output of TE mode.A high extinction ratio can be obtained because of the selectivity of surface plasmon polaritons(SPPs)on polarization.The effects of the polarizer parameters on coupling efficiency and extinction ratio are discussed.Simulation results indicate that the coupling efficiency for TE mode can reach about 95%,but only 3% for TM mode,with the extinction ratio of TE mode about 15 dB when the light wavelength is 1550 nm.The polarizer may have potential applications in photonic integrated circuits and quantum information technology.
基金supported by the National Natural Science Foundation of China(No.62005317)the National Key R&D Program of China(No.2020YFA0713504)the Natural Science Foundation of Hunan Province,China(No.2021JJ40695)。
文摘For speckle-correlation-based scattering imaging,an iris is generally used next to the diffuser to magnify the speckle size and enhance the speckle contrast,which limits the light flux and makes the setup cooperative.Here,we experimentally demonstrate a non-iris speckle-correlation imaging method associated with an image resizing process.The experimental results demonstrate that,by estimating an appropriate resizing factor,our method can achieve high-fidelity noncooperative speckle-correlation imaging by digital resizing of the raw captions or on-chip pixel binning without iris.The method opens a new door for noncooperative high-frame-rate speckle-correlation imaging and benefits scattering imaging for dynamic objects hidden behind opaque barriers.
