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Multichannel Spatially Nonhomogeneous Focused Vector Vortex Beams for Quantum Experiments
摘要： The utilization of vector vortex beams (VVBs) in quantum experiments has recently become a topic of tremendous interest. However, achieving a focused, high-resolution, transmission-type, multichannel, and nonhomogeneously polarized VVB array remains a great challenge. Here, by introducing a degree of freedom on a high-order Poincaré sphere in the form of latitude-polarization control and locally tailoring the phase and transverse polarization distributions at the subwavelength scale, a single transmission-type dielectric metalens design for producing a multichannel, spatially nonhomogeneous, focused VVB array is demonstrated. Three special kinds of lattices (triangle, square, and rhombus) are demonstrated, yielding independently controllable orbital angular momentum states and polarization states of a tightly focused field in each channel. Furthermore, by using only the proposed metalens and a polarizer, a mode-demultiplexing system is realized with a mode crosstalk as low as ?34.8 dB for all four channels. The results offer a robust technological foundation for exploiting spatial degrees of freedom of structured light in the miniaturization and integration of quantum photonics devices.
关键词： mode crosstalk,metalens,mode-demultiplexing system,vector vortex beams,latitude polarization
更新于2025-09-19 17:15:36
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[IEEE 2018 Asia Communications and Photonics Conference (ACP) - Hangzhou, China (2018.10.26-2018.10.29)] 2018 Asia Communications and Photonics Conference (ACP) - Measurement of Crosstalk between LP<inf>01</inf> and LP<inf>11</inf> Modes in a Two-mode Fiber Link by Using Backscattered Power
摘要： We propose a simple technique for measuring mode crosstalk between LP01 and LP11 modes using backscattered power. The mode crosstalk of each fiber in a fiber link is successfully estimated by the proposed technique.
关键词： two-mode fiber,backscattered power,mode crosstalk
更新于2025-09-19 17:15:36
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[IEEE 2019 24th OptoElectronics and Communications Conference (OECC) and 2019 International Conference on Photonics in Switching and Computing (PSC) - Fukuoka, Japan (2019.7.7-2019.7.11)] 2019 24th OptoElectronics and Communications Conference (OECC) and 2019 International Conference on Photonics in Switching and Computing (PSC) - Propagation Mode Retention Using Strongly Coupled Multi-Core Fiber
摘要： Strongly coupled MCF is studied in propagation mode retaining capability as regular multi-mode fiber has an issue of mode crosstalk. As a result, mode retention characteristics of 5dB at 80 mm bending radius has been confirmed successfully.
关键词： Fibers for space division multiplexing,Strongly coupled fiber,Mode crosstalk
更新于2025-09-16 10:30:52