Broadband Single‐Chip Full Stokes Polarization‐Spectral Imaging Based on All‐Dielectric Spatial Multiplexing Metalens

Abstract

Compared with intensity imaging, more inherent information of objects can be obtained by polarization and multispectral imaging. Here, a broadband and highly integrated single-chip full Stokes polarization-spectral (FSPS) imaging is demonstrated using all-dielectric spatially multiplexed metalens (SMM) in the wavelength band from 1400 to 1700 nm. The proposed FSPS-SMM is composed of three sets of off-axis sub-metalens simultaneously working for pairs of 0°/90°, 45°/135°linear polarization (LP), and left-handed/right-handed circular polarization (CP), respectively. Experimental results show that the optical resolution of each sub-metalens of the fabricated FSPS-SMM reaches the diffraction limit of the full-aperture metalens although the area of each sub-metalens is only 1/3 of the entire metalens, the averaged polarization extinction ratio of both LP and CP reaches 32.8:1, and the energy efficiency reaches 81.8% at the design wavelength and 60% averagely in the whole 300 nm bandwidth, which breaks the 50% limit of conventional polarizer-based methods. The proposed design provides a new idea for high-efficiency and high-resolution full Stokes polarization-spectral imaging and multichannel information processing.

UV-Nanoimprint and Deep Reactive Ion Etching of High Efficiency Silicon Metalenses: High Throughput at Low Cost with Excellent Resolution and Repeatability

“…Such nano-photonic arrays are often called optical metasurfaces (OMS), owing to their display of optical properties beyond those typically found in nature. Examples of optical devices that have been demonstrated include innovative gratings, flat lenses, mirrors, advanced holograms, waveplates, polarizers, and spectral filters [ 3 , 9 , 10 , 11 , 12 , 13 , 14 ]. Following an exploratory phase of research typically conducted in university environments (resulting in more than ten thousand publications [ 15 ]), the technologies have started to migrate into industrial research with large multinational companies such as Samsung and ST Microelectronics running internal research [ 16 ] and even launching OMS products [ 17 ].…”

Design of scalable metalens array for optical addressing

“…The refractive index of Nb 2 O 5 is 2.76 + 0.02i at the wavelength of 350 nm [37]. In general, the electromagnetic response of an anisotropic nanopillar can be described by a Jones matrix [38]: where x , y denote the phase of output light wave under the normal incidence of x-LP and y linearly polarized (y-LP), respectively; is the azimuth angle of nanopillars relative to the x-axis; R( ) is the rotation matrix.…”

Polarization Detection of Terahertz Waves using All‐Silicon Metasurfaces with Tightly Focusing Behavior

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