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Polarization beam splitter based on all-dielectric metasurface and terahertz wave modulator

A polarization beam splitter and metasurface technology, applied in the field of terahertz waves, can solve the problems of ineffective transmission loss and low modulation efficiency, and achieve low transmission loss and high transmission efficiency

Pending Publication Date: 2022-04-08
SHANDONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Terahertz waves have loss and air absorption during transmission. When modulating transmitted terahertz waves, the beam splitter made of metal as a metasurface material has low modulation efficiency due to ohmic loss and cannot effectively solve the transmission problem. loss problem

Method used

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  • Polarization beam splitter based on all-dielectric metasurface and terahertz wave modulator
  • Polarization beam splitter based on all-dielectric metasurface and terahertz wave modulator
  • Polarization beam splitter based on all-dielectric metasurface and terahertz wave modulator

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Embodiment 1

[0032] Such as figure 1 As shown, this embodiment provides a polarizing beam splitter based on an all-dielectric metasurface, comprising: a supercell arranged in a periodic array; the supercell includes several basic units, and the basic unit includes a substrate The bottom and the antenna arranged on the substrate, the size of the antenna can be adjusted, so that at a specific frequency, the incident x-polarized light and y-polarized light are deflected at the same angle and in different directions.

[0033] As an optional implementation manner, the arrangement periods of the supercells on the x-axis and y-axis are 930 μm and 155 μm, respectively.

[0034] As an optional implementation manner, a supercell includes six basic units.

[0035] As an optional implementation manner, the antenna is a silicon dielectric antenna, and the antenna is arranged above the substrate.

Embodiment approach

[0036] As an optional implementation manner, the substrate is a PDMS substrate.

[0037] Such as figure 2 As shown, the substrate of the basic unit is a cube with equal side lengths, both of which are P=155 μm, and the height of the silicon dielectric antenna is h=200 μm.

[0038] In this embodiment, by adjusting the horizontal and vertical dimensions of the antenna, that is, adjusting the length and width of the antenna, the transmission amplitude and phase of the incident x-polarized light and y-polarized light are respectively controlled to realize the incident x-polarized light and y-polarized light The deflection of polarized light at the same angle but in different directions.

[0039] This embodiment utilizes finite element simulation tool to carry out electromagnetic simulation analysis; Fig. 3 (a) and Fig. 3 (b) are under 0.8THz frequency, when x-polarized light is incident, the transmission amplitude of the different lateral and longitudinal dimensions of silicon d...

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Abstract

The invention discloses an all-dielectric metasurface-based polarization beam splitter and terahertz wave modulator. The all-dielectric metasurface-based polarization beam splitter comprises super unit cells arranged in a periodic array form; the super unit cell comprises a plurality of basic units, each basic unit comprises a substrate and an antenna arranged on the substrate, and the size of each antenna is adjustable, so that incident x polarized light and y polarized light deflect at the same angle and in different directions under a specific frequency. High transmission efficiency and lower transmission loss are realized.

Description

technical field [0001] The invention relates to the technical field of terahertz waves, in particular to a polarization beam splitter and a terahertz wave modulator based on an all-dielectric metasurface. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] A metasurface is a metamaterial composed of ultrathin artificial microstructures that can modulate the amplitude, phase, and polarization state of electromagnetic waves. Compared with traditional optical devices, metasurfaces play an important role in the research of optical devices due to their smaller volume, higher integration and stronger flexibility. [0004] Terahertz waves have loss and air absorption during transmission. When modulating transmitted terahertz waves, the beam splitter made of metal as a metasurface material has low modulation efficiency due to ohmic loss, and cannot e...

Claims

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Application Information

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IPC IPC(8): G02B27/28G02B1/00
Inventor 岳伟伟孙宝平
Owner SHANDONG NORMAL UNIV
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