Polarization is an important feature of electromagnetic waves, and it is another important attribute of
light in addition to wavelength, amplitude, and phase. However, the current traditional polarization
imaging equipment is complicated in structure, large in size, and heavy, and polarization splitting and
focusing imaging require two optical components to achieve, which is difficult to integrate and
miniaturize, which severely restricts the practical application of polarization imaging. The matelens can
precisely control the information of the phase, amplitude, polarization and other information of the
light, is compatible with the Complementary Metal Oxide Semiconductor (CMOS) manufacturing
process, and has great development prospects in terms of device lightweight and mass manufacturing.
Aiming at the lightweight requirements of infrared imaging lenses, this paper uses finite-difference
time-domain (FDTD) software, combining geometric phase and transmission phase to design and
simulate a silicon-based circularly polarized matelens with a working wavelength of 3um, The diameter
is 40um, the focal length f is 10um, and the method of combining three-dimensional and remote
calculation is used to reduce the simulation time and computer memory.
Circularly polarized light is polarization-preserving and sensitive to special substances and has great application potential in cloud removal and target recognition. Traditional circularly polarized light imaging equipment requires a variety of optical devices such as a linear polarizer, wave plate, and focusing lens, which increases the complexity of the system and affects the volume and weight of the system. In this paper, we present a compact circularly polarized light camera, which realizes the extraction and focusing of circularly polarized light by using multifunctional planar metalens. The design material of the metalens is amorphous silicon, with an operating wavelength of 800 nm, a diameter of 2 mm, and a focal length of 20 mm. The test results show that the circularly polarized light camera has a good imaging effect and meets the design requirements. This paper explores the further application of metalens and promotes the wide application of polarizing imaging in machine vision, remote sensing, and other fields.
A metalens is a planar optical device that can accurately control the phase, polarization, and amplitude of light. Aiming at the application requirements of polarization imaging equipment for miniaturization, integration, and common field of view, we designed and fabricated two kinds of orthogonally polarized metalenses based on amorphous silicon and fused quartz. These metalenses can achieve orthogonal linear or circular polarization light imaging with a common field of view. The samples with a 2-mm diameter and 20-mm focal length were fabricated by electron beam exposure. The test results show that these metalenses can realize the imaging of orthogonal linearly or circularly polarized light simultaneously; the focusing efficiency is more than 50%, and the polarization contrast is >22 dB.
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