A nonreciprocal angular selective absorber with the special multilayer structure

Baofei Wan,Ziwei Zhou,Yu Ma,Dan Zhang,Haifeng Zhang

doi:10.1007/s11082-021-03465-y

Abstract

Due to the orderly design of the special anti-reflection structure and the absorption structure, the one-dimensional layered periodic structure has a good impedance matching in a certain frequency band and a large-angle range, providing for the realization of an angular selective absorber (ASA) with a high rectangle coefficient. For the sake of obtaining excellent absorptivity, the indium tin oxide (ITO) film is used, and it also acts as a function of tuning the absorption angle range (AAR) of the ASA by adjusting the plasma frequency. The proportional relationship between the thickness of the dielectric layers is also discussed to satisfy a good absorption function. At the same time, the ASA also possesses productive nonreciprocal performance (NP) and can also be controlled by the plasma frequency. The transfer matrix method is used for numerical simulation. Our special tunable ASA with the NP is relatively rare in previous studies, which can be applied to optical communications and military fields. Furthermore, we hope that the design we proposed can provide new possibilities for the development of the ASAs.

Highlights

The one-dimensional layered periodic structure [1,2] has been widely used in the past decade due to its flexibility in manufacturing, small size, and strong functionality
Previous studies on the angular selective function devices (ASFDs) with productive performance are more about the implementation of filter pieces, and few people can realize the angular selective absorber (ASA) with a high absorption rate and high rectangular coefficient
If the frequency band satisfying the condition that the absorptance is higher than 0.9 and B is over 0.95 is selected as the effective area, the ASA we put forward can work in the range of 514 THz~548 THz, such a large bandwidth can meet certain requirements in practical applications

Summary

Introduction

The one-dimensional layered periodic structure [1,2] has been widely used in the past decade due to its flexibility in manufacturing, small size, and strong functionality It plays an indispensable role in the fields of sensors [3,4,5], filters [6,7,8], and absorbers [9,10,11]. In Ref.[13], a wide-angle ASFD that is not affected by the polarization mode is studied The structure they proposed shows properties independent of the polarization state in the dispersion model, so the defect layer can make part of the light propagate at a specific frequency in the photonic band gap like a Fabry-Perot resonance. The tunability and non-reciprocity of this kind of absorber based on angle selection are studied

Objectives

Discussion

Conclusion