Anisotropic Fermat’s principle for controlling hyperbolic van der Waals polaritons  

作　　者：SICEN TAO TAO HOU YALI ZENG GUANGWEI HU ZIXUN GE JUNKE LIAO SHAN ZHU TAN ZHANG CHENG-WEI QIU HUANYANG CHEN 

机构地区：[1]Department of Physics,Institute of Electromagnetics and Acoustics,College of Physical Science and Technology,Xiamen University,Xiamen 361005,China [2]Department of Electrical and Computer Engineering,National University of Singapore,Singapore 117583,Singapore

出　　处：《Photonics Research》2022年第10期I0023-I0031,共9页光子学研究（英文版）

基　　金：National Natural Science Foundation of China(92050102,11874311);National Key Research and Development Program of China(2020YFA0710100);Fundamental Research Funds for the Central Universities(20720220033,20720200074,20720220134);Shenzhen Science and Technology Program(JCYJ20210324121610028);China Scholarship Council(201906310019);Advanced Research and Technology Innovation Centre(ARTIC),National University of Singapore(A-0005947-16-00).

摘　　要：Transformation optics(TO)facilitates flexible designs of spatial modulation of optical materials via coordinate transformations,thus,enabling on-demand manipulations of electromagnetic waves.However,the application of TO theory in control of hyperbolic waves remains elusive due to the spatial metric signature transition from(+,+)to(−,+)of a two-dimensional hyperbolic geometry.Here,we proposed a distinct Pythagorean theorem,which leads to establishing an anisotropic Fermat’s principle.It helps to construct anisotropic geometries and is a powerful tool for manipulating hyperbolic waves at the nanoscale and polaritons.Making use of absolute instruments,the excellent collimating and focusing behaviors of naturally in-plane hyperbolic polaritons in van der Waals𝛼α–MoO_(3)layers are demonstrated,which opens up a new way for polaritons manipulation.

关 键 词：HYPERBOLIC POLAR Fermat 

分 类 号：O441.4[理学—电磁学] TB34[理学—物理]