Theoretical analysis and design of a near-infrared broadband absorber based on EC model | Zendy

Qing Zhang | Zendy; Lihua Bai | Zendy; Zhengyuan Bai | Zendy; Pidong Hu | Zendy; Chengpu Liu | Zendy

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Theoretical analysis and design of a near-infrared broadband absorber based on EC model

Author(s) -

Qing Zhang,

Lihua Bai,

Zhengyuan Bai,

Pidong Hu,

Chengpu Liu

Publication year - 2015

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.23.008910

Subject(s) - finite difference time domain method , broadband , optics , pyramid (geometry) , equivalent circuit , polarization (electrochemistry) , materials science , infrared , circuit design , dielectric , optoelectronics , computer science , physics , electronic engineering , voltage , engineering , chemistry , quantum mechanics

We theoretically introduced a design paradigm and tool by extending the circuit functionalities from radio frequency to near infrared domain, and its first usage to design a broadband near-infrared (1.5μm~3.5μm) absorber, is successfully demonstrated. After extracting the equivalent circuit (EC) model of the absorber structure, the formerly relatively complicated frequency response can be evaluated relatively easily based on classic circuit formulas. The feasibility is confirmed by its consistency with the rigorous FDTD calculation. The absorber is an array of truncated metal-dielectric multilayer composited pyramid unit structure, and the gradually modified square patch design makes the absorber be not sensitive to the incident angle and polarization of light.

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