Broadband Negative Refraction of Highly Squeezed Hyperbolic Polaritons in 2D Materials
Negative refraction of hyperbolic polaritons supported by naturally anisotropic 2D materials. (a) Imaginary part of surface conductivity of anisotropic 2D material in the left region. In (2), we set ,,,,,,, and , where and is the free-electron mass. (b) Distribution of electric field excited by a dipole source at 60 THz. The red dashed line represents the boundary between left/right regions. For the right region, we have and .