Lithography-free polarization-dependent absorber based on α-MoO_(3)  

作　　者：HU Yang WU XiaoHu LI HongJu ZHAO Yi LIU HaoTuo HUANG XiuQuan 

机构地区：[1]School of Power and Energy,Northwestern Polytechnical University,Xi’an 710072,China [2]Shandong Institute of Advanced Technology,Jinan 250100,China [3]School of Physics,Hefei University of Technology,Hefei 230009,China [4]Department of Academic Affairs,Harbin Institute of Technology(Shenzhen),Shenzhen 518055,China [5]Key Laboratory of Advanced Manufacturing and Intelligent Technology,Ministry of Education,Harbin University of Science and Technology,Harbin 150080,China

出　　处：《Science China(Technological Sciences)》2024年第7期2147-2152,共6页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant No. 52106099);Shandong Provincial Natural Science Foundation (Grant No. ZR2022YQ57);Taishan Scholars Program;Basic and Applied Basic Research Fund Project of Guangdong Province (Grant No. 2019A1515111178)。

摘　　要：As a natural biaxial hyperbolic material, α-phase molybdenum trioxide(α-MoO_(3)) exhibits dielectric and metallic properties in the plane, rendering it an exceptional candidate for polarization-dependent devices. In this work, we design a lithography-free polarization-dependent absorber consisting of an α-MoO_(3)film, a germanium layer, and a silver substrate. The results show that a narrowband absorption of up to 0.99 is achieved at a wavelength of 12.2 μm for transverse magnetic polarization. In contrast, the absorption is only 0.06 at this wavelength for transverse electric polarization. This remarkable polarization-dependent absorption performance is attributed to the coupling of epsilon-near-zero modes and Fabry-Perot resonances, which is confirmed by the electric field and power dissipation density distributions. Furthermore, strong polarization-dependent performance could also be achieved when the crystal axis of α-MoO_(3)is rotated in the out-of-plane. This work demonstrates that in-plane anisotropic α-MoO_(3)has the potential for designing high polarization-dependent devices.

关 键 词：α-MoO_(3) polarization-dependent epsilon-near-zero modes Fabry-Perot resonances 

分 类 号：O436.3[机械工程—光学工程] TQ136.12[理学—光学]