| 1 | Anisotropic Fermat’s principle for controlling hyperbolic van der Waals polaritons显示文摘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 Waals��α–MoO_(3)layers are demonstrated,which opens up a new way for polaritons manipulation. | SICEN TAO TAO HOU YALI ZENG GUANGWEI HU ZIXUN GE JUNKE LIAO SHAN ZHU TAN ZHANG CHENG-WEI QIU HUANYANG CHEN | 2022 | Photonics Research2022，10，10： | 0 |
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