Device and method for arbitrary polarization dynamic regulation based on metasurface-phase change materials
A phase change material, polarization state technology, applied in instruments, nonlinear optics, optics, etc., can solve problems such as difficult to achieve dynamic polarization control, and achieve the effect of expanding the dynamic application range, reducing volume and weight, and avoiding cross-talk
Active Publication Date: 2019-03-22
BEIJING INSTITUTE OF TECHNOLOGYGY
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[0005] The purpose of the present invention is to solve the problem that current metasurface polarization devices are difficult to realize dynamic polarization regulation, and to provide a device and method for arbitrary polarization dynamic regulation based on metasurface-phase change materials
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[0030] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments. The specific implementations described here are only used to explain the present invention, not to limit the present invention.
[0031] Taking a metasurface with a working wavelength of λ=4 μm as an example, a device and method for dynamically adjusting arbitrary polarization based on a metasurface-phase change material are proposed below. Among them, a metasurface-phase change material-based dynamic control device for any polarization state is composed of a V-shaped nano-antenna layer, a spaced modulation layer and a substrate, such as figure 1 shown. The design process for this device consists of two main steps:
[0032] (1) Metasurface V-shaped nanoantenna array design
[0033] A single period of a metasurface based on a V-shaped nanoantenna array contains two differently arranged subunits, which are mainly used to generate a surface phase gradie...
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The invention relates to an arbitrary polarization dynamic control device and method based on metamaterial surface-phase change material, and belongs to the technical field of micro-nano optical applications. A metamaterial surface based on a V type nano-antenna array is used for reacting with a light field to generate a surface phase gradient, which causes that the abnormally transmitted polarized light generated under the condition of line polarized light normal incidence, deflects from the normal direction of the surface. At the same time, with the introduction of an interval modulation layer comprising periodically arrayed germanium-antimony-tellurium, under external excitation, phase differences of orthogonal polarization state emitted by different units are modulated, and overlap in space to achieve random polarization state synthesis of an outgoing light field. The method is an all-solid-state modulation method with no necessity of any mechanical modulation measures such as drawing or rotating. The separation of random polarized light and background light beams can be achieved to avoid cross fire. The method provides a flexible regulation and control measure for on-chip polarization applications of integrated optics.
Description
technical field [0001] The invention relates to a device and method for arbitrary polarization dynamic regulation based on a metasurface-phase change material, and belongs to the technical field of micro-nano optics applications. Background technique [0002] The state of polarization is a fundamental property of electromagnetic waves. Controlling the polarization state of electromagnetic waves and realizing arbitrary conversion of different polarization states has a wide range of applications in optoelectronic communication, biosensing, precision measurement, remote sensing and other fields. Traditional polarization modulation methods mainly rely on anisotropic materials, such as birefringent natural crystals such as quartz and calcite, by rotating the angle between the optical axis of the crystal and the incident polarization state to control the phase difference between ordinary light and extraordinary light to achieve polarization state regulation. The traditional geom...
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IPC IPC(8): G02F1/01
CPCG02F1/0136
Inventor 黄玲玲李天佑张天瑶刘娟王涌天
Owner BEIJING INSTITUTE OF TECHNOLOGYGY