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: A novel method for rapid polarization measurement is suggested, based on a periodic space-variant polarizer that can be realized by use of subwavelength metal-stripe gratings and demonstrated with polarization measurements of CO(2)-laser radiation at a wavelength of 10.6mum.
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: The state of polarization (SOP) is an inherent property of light that can be used to gain crucial information about the composition and structure of materials interrogated with light as mentioned in this paper, but the SOP is difficult to experimentally determine since it involves phase information between orthogonal polarization states, and is uncorrelated with the light intensity and frequency, which can be easily determined with photodetectors and spectrometers.
TL;DR: In this paper, a spin-selective directional coupler was proposed to couple free-space light into a waveguide, which achieved a coupling efficiency of 51.6% at 1836 nm, but this coupler only works for linearly polarized beams and cannot realize wavelength demultiplexing.
TL;DR: In this paper, the authors discuss the recent achievements in gradient metasurface-based unidirectional surface plasmon polaritons couplers (i.e., metacouplers).
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 ].