- 标题
- 摘要
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- 实验方案
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Arbitrary Polarization Conversion with a Photonic Crystal Slab
摘要： It is shown that a simple photonic crystal slab structure provides a powerful mechanism for the control of the polarization properties of light. For a lossless system, for a given incident light with any fixed polarization, one can generate arbitrary polarization in the reflected light, as one varies the direction of the incident light. In the lossy system, the capability for arbitrary polarization generation is still preserved for s- or p-polarized incident light. This capability for arbitrary polarization generation closely relates to the nontrivial topological properties of the reflection matrix of the structure and exists over a wide range of frequencies.
关键词： photonic crystals,polarization conversion,Poincaré sphere,Stokes parameters
更新于2025-09-23 15:22:29
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Poincaré sphere-based technique for tuning flat-top fiber comb filter
摘要： We propose a universal method for designing flat-top passband and wavelength tuning of transmission spectrum of a fiber comb filter based on a polarization-diversified loop structure using Poincaré sphere representation. The proposed method gives a clear visualization of the evolution of polarization state through birefringent optical elements comprising the filter, and the design results are experimentally verified. Our method can also suggest which optical components are necessary for a specifically desired transmission spectrum of the comb filter.
关键词： flat-top passband,polarization-diversified loop structure,fiber comb filter,Poincaré sphere,wavelength tuning
更新于2025-09-23 15:21:01
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Using the Belinfante momentum to retrieve the polarization state of light inside waveguides
摘要： current day high speed optical communication systems employ photonic circuits using platforms such as silicon photonics. In these systems, the polarization state of light drifts due to effects such as polarization mode dispersion and nonlinear phenomena generated by photonic circuit building blocks. As the complexity, the number, and the variety of these building blocks grows, the demand increases for an in-situ polarization determination strategy. Here, we show that the transfer of the Belinfante momentum to particles in the evanescent field of waveguides depends in a non-trivial way on the polarization state of light within that waveguide. Surprisingly, we find that the maxima and minima of the lateral force are not produced with circularly polarized light, corresponding to the north and south poles of the Poincaré sphere. Instead, the maxima are shifted along the great circle of the sphere due to the phase differences between the scattered TE and TM components of light. This effect allows for an unambiguous reconstruction of the local polarization state of light inside a waveguide. Importantly, this technique depends on interaction with only the evanescent tails of the fields, allowing for a minimally invasive method to probe the polarization within a photonic chip.
关键词： waveguides,Poincaré sphere,Belinfante momentum,evanescent field,optical communication,photonic chip,TE and TM components,silicon photonics,polarization state
更新于2025-09-19 17:13:59
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Polarization Organisation Hidden in the Middle Point of an Optical Fiber
摘要： Since the pioneering studies on polarization dynamics of two counter-propagating beams in nonlinear optical fibers, different processes of polarization attraction have been identified in isotropic fiber, but also in highly, weakly and randomly birefringent fibers. In this framework, the polarization attraction requires a fully polarized pump wave, which plays the role of a natural attractor for an arbitrary polarized incoming beam. Subsequently, this phenomenon has been observed using a single wave interacting with its own back-reflected wave in a feedback loop configuration. Here, we report a new configuration of polarization self-organization with two uncorrelated arbitrary polarized waves that occurs in the middle point of an optical isotropic fiber. The state of polarization (SOP) of the two counterpropagating waves evolves and fluctuates over the surface of the Poincaré sphere with a coherence time τc. During the propagation, the SOP is deeply modified by the nonlinear interaction: While the injected SOPs fluctuate all over the Poincaré spheres, the SOPs in the middle point of the fiber are attracted toward the poles of the spheres, which correspond to the circular polarization states of the fields. Then both waves recover a random state at their corresponding fiber outputs. This effect has been demonstrated experimentally considering 256 randomly distributed initial pulses in an 200-m long isotropic fiber.
关键词： coherence time,optical fibers,polarization attraction,Poincaré sphere,polarization dynamics
更新于2025-09-16 10:30:52
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A vector holographic optical trap
摘要： The invention of optical tweezers almost forty years ago has triggered applications spanning multiple disciplines and has also found its way into commercial products. A major breakthrough came with the invention of holographic optical tweezers (HOTs), allowing simultaneous manipulation of many particles, traditionally done with arrays of scalar beams. Here we demonstrate a vector HOT with arrays of digitally controlled Higher-Order Poincaré Sphere (HOPS) beams. We employ a simple set-up using a spatial light modulator and show that each beam in the array can be manipulated independently and set to an arbitrary HOPS state, including replicating traditional scalar beam HOTs. We demonstrate trapping and tweezing with customized arrays of HOPS beams comprising scalar orbital angular momentum and cylindrical vector beams, including radially and azimuthally polarized beams simultaneously in the same trap. Our approach is general enough to be easily extended to arbitrary vector beams, could be implemented with fast refresh rates and will be of interest to the structured light and optical manipulation communities alike.
关键词： vector beams,optical manipulation,Higher-Order Poincaré Sphere,holographic optical tweezers,optical tweezers
更新于2025-09-09 09:28:46