Title: Wavelength-selective mid-infrared metamaterial absorbers with multiple tungsten cross resonators

Abstract

Wavelength-selective metamaterial absorbers in the mid-infrared range are demonstrated by using multiple tungsten cross resonators. By adjusting the geometrical parameters of cross resonators in single-sized unit cells, near-perfect absorption with single absorption peak tunable from 3.5 μm to 5.5 μm is realized. The combination of two, three, or four cross resonators of different sizes in one unit cell enables broadband near-perfect absorption at mid-infrared range. The obtained absorption spectra exhibit omnidirectiona lity and weak dependence on incident polarization. The underlying mechanism of near-perfect absorption with cross resonators is further explained by the optical mode analysis, dispersion relation and equivalent RLC circuit model. Furthermore, thermal analysis is performed to study the heat generation and temperature increase in the cross resonator absorbers, while the energy conversion efficiency is calculated for the thermophotovolta ic system made of the cross resonator thermal emitters and low-bandgap semiconductors.

Authors:

Li, Zhigang; Stan, Liliana; Czaplewski, David A.; Yang, Xiaodong; Gao, Jie

Publication Date:

2018-02-23

Research Org.:

Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Org.:

USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division; National Science Foundation (NSF); US Department of the Navy, Office of Naval Research (ONR)

OSTI Identifier:

1422450

Alternate Identifier(s):

OSTI ID: 1477174

Grant/Contract Number:  

AC02-06CH11357

Resource Type:

Published Article

Journal Name:

Optics Express

Additional Journal Information:

Journal Name: Optics Express Journal Volume: 26 Journal Issue: 5; Journal ID: ISSN 1094-4087

Publisher:

Optical Society of America

Country of Publication:

United States

Language:

English

Subject:

36 MATERIALS SCIENCE; absorption; resonance; infrared