VO2-hBN-graphene-based bi-functional metamaterial for mid-infrared bi-tunable asymmetric transmission and nearly perfect resonant absorption

被引:31
作者
Hajian, Hodjat [1 ]
Ghobadi, Amir [1 ,2 ]
Serebryannikov, Andriy E. [3 ,4 ]
Butun, Bayram [1 ]
Vandenbosch, Guy A. E. [4 ]
Ozbay, Ekmel [1 ,2 ,5 ,6 ]
机构
[1] Bilkent Univ, NANOTAM Nanotechnol Res Ctr, TR-06800 Ankara, Turkey
[2] Bilkent Univ, Dept Elect & Elect Engn, TR-06800 Ankara, Turkey
[3] Adam Mickiewicz Univ, Fac Phys, PL-61614 Poznan, Poland
[4] Katholieke Univ Leuven, ESAT TELEM, B-3000 Leuven, Belgium
[5] Bilkent Univ, Dept Phys, TR-06800 Ankara, Turkey
[6] Bilkent Univ, UNAM Inst Mat Sci & Nanotechnol, TR-06800 Ankara, Turkey
关键词
LIGHT-MATTER INTERACTION; HEXAGONAL BORON-NITRIDE; BROAD-BAND; PHONON POLARITONS; PHASE-TRANSITION; DUAL-BAND; GRAPHENE; ABSORBERS; METASURFACE; WAVES;
D O I
10.1364/JOSAB.36.001607
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Bi-tunable asymmetric light transmission (AT) and nearly perfect resonant absorption functionalities are achieved by a Lorentz-reciprocal metamaterial for the operation at the mid-infrared (MIR) wavelengths and transverse magnetic polarization. The bi-tunable metamaterial with bi-functional features and a total thickness of 1.8 mu m is based on an hBN/graphene/hBN heterostructure that is bounded by a Ge grating on the upper side and a hybrid VO2/Au grating on the lower side. Through analytical calculations, we first investigate how the dispersion characteristics of the high-beta hyperbolic phonon polaritons of hBN can be controlled and hybridized through the insulator (i-VO2) to metal (m-VO2) transition of VO2 in a bare hBN/VO2 heterostructure. Then, at the absence of graphene and owing to the support of the hybridized high-beta modes, a broad and efficient AT with forward-to-backward contrast exceeding 40% is obtained by numerical calculations for the i-VO2 case, as the first functionality of the structure. Moreover, it is found that for the m-VO2 case, the device is no longer transmittive and a nearly perfect resonant absorption response, as the second functionality, is observed for backward illumination. Finally, by introducing multilayer graphene into the structure and considering the intermediate states of VO2 in the calculations, the bi-tunable transmission and absorption characteristics of the device are investigated. We believe the designed metamaterial is well-suited for MIR optical diodes, sensors, and thermal emitters. (c) 2019 Optical Society of America
引用
收藏
页码:1607 / 1615
页数:9
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