In this article, the authors proposed a new type of polarimeter that is compact and well-suited for in-plane optical circuitry, while allowing for immediate determination of the SOP through simultaneous retrieval of the associated Stokes parameters.
Abstract:
The state of polarization (SOP) is an inherent property of the vectorial nature of light and a crucial parameter in a wide range of remote sensing applications. Nevertheless, the SOP is rather cumbersome to probe experimentally, as conventional detectors only respond to the intensity of the light, hence loosing the phase information between orthogonal vector components. In this work, we propose a new type of polarimeter that is compact and well-suited for in-plane optical circuitry, while allowing for immediate determination of the SOP through simultaneous retrieval of the associated Stokes parameters. The polarimeter is based on plasmonic phase-gradient birefringent metasurfaces that facilitate normal incident light to launch in-plane photonic waveguide modes propagating in six predefined directions with the coupling efficiencies providing a direct measure of the incident SOP. The functionality and accuracy of the polarimeter, which essentially is an all-polarization sensitive waveguide metacoupler, is confirmed through full-wave simulations at the operation wavelength of 1.55$\mu$m.
TL;DR: Silva et al. as mentioned in this paper proposed reflective metasurfaces consisting of arrayed gold nanobricks atop a subwavelength-thin dielectric spacer and optically-thick gold film, a configuration that supports gap-surface plasmon resonances.
TL;DR: In this article, an in-line (signal-saving) metasurface polarimeter is proposed based on subwavelength-spaced phased arrays of gold nanorod antennas that provide an intensity modulation of scattered light depending on the polarization of the incident light.
TL;DR: In this paper, the authors introduce the underlying mechanisms of three types of phase discontinuities and review more complex and advanced information photonics that have emerged from metasurfaces, as well as an outlook on future development directions.
TL;DR: In this article, a multiplexed Pancharatnam-berry phase metasurface was used to generate orthogonally polarized holograms that partially overlap with a spatially varying phase difference.
TL;DR: A broadband division-of-amplitude polarimeter (DOAP) is presented that can provide the real-time measurement of any state of polarization of light, described by its Stokes vector, in large spectral windows within the spectral window.
TL;DR: This work shows that a metasurface grating can be designed to produce arbitrarily specified polarization states on a set of defined diffraction orders given that the polarization of the incident beam is known.
TL;DR: In this article, a chip-size plasmonic spectropolarimeters, consisting of three gap-plasmon phase-gradient metasurfaces that occupy 120° circular sectors each, for simultaneous polarization state and wavelength determination are presented.
Q1. What are the contributions mentioned in the paper "Waveguide metacouplers for in-plane polarimetry" ?
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Q2. What are the future works mentioned in the paper "Waveguide metacouplers for in-plane polarimetry" ?
In summary, the authors design a compact in-plane polarimeter that couples incident light into waveguide modes propagating along six different directions, with the coupling efficiencies being dictated by the SOP. Finally, the authors stress that the suggested in-plane polarimeter can be realized by only one step of electron-beam lithography, while simple proof-of-concept experiments can be performed by placing outcoupling gratings along the six in-plane propagation directions, with the associated scattered light being a measure of the coupling efficiencies. Moreover, the authors foresee the possibility of a compact circuitry with built-in plasmonic detectors that are integrated into spatially confined waveguides [ 33,34 ]. The authors note that the choice of the design wavelength at 1. 55 μm is merely to illustrate its potential usage in compact integrated optical circuitry, but the design strategy can be transferred to any frequency range of interest, be it either at optical wavelengths [ 30 ] or the microwave regime [ 31 ].