Design of Coding Metasurface Units Based on a New Deep Deterministic Policy Gradient Algorithm

In this letter, a design method of broadband digital coding metasurface units based on a novel deep deterministic policy gradient (DDPG) algorithm is proposed. And a reflective-coded metasurface unit with a surface structure randomly arranged by discrete micro digital patterns is proposed. Its struc...

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Bibliographic Details
Published in:IEEE photonics technology letters Vol. 36; no. 18; pp. 1117 - 1120
Main Authors: Jiang, Yilin, Tian, Yuxi, Li, Jinxin, Yan, Chengyue, Pan, Yuxuan
Format: Journal Article
Language:English
Published: New York IEEE 15.09.2024
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Algorithms
Broadband
Coding
deep deterministic policy gradient
digital coding metasurface
Encoding
Metamaterials
Metasurfaces
Phase shift
Reflection
Reflection coefficient
Software
Software algorithms
Surface structure
ISSN:1041-1135, 1941-0174
Online Access:Get full text
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Summary:In this letter, a design method of broadband digital coding metasurface units based on a novel deep deterministic policy gradient (DDPG) algorithm is proposed. And a reflective-coded metasurface unit with a surface structure randomly arranged by discrete micro digital patterns is proposed. Its structure is optimized based on the DDPG algorithm, which achieve constant phase difference in the broadband. The units designed in this work achieve a 1 bit phase shift with a bandwidth of 1.54 GHz within 170 degree to 190 degree from 9.26 to 10.8 GHz and a 2 bit phase shift with a bandwidth of 0.5 GHz within 80 degree to 100 degree from 11.04 to 11.54 GHz.
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ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2024.3427138