Wangleong Chen

Abstract Hyperbolic media enable unique optical phenomena including hyperlensing, negative refraction, enhanced photonic density of states (PDOS), and highly confined polaritons. While most hyperbolic media are artificially engineered metamaterials, certain natural materials with extreme anisotropy can exhibit hyperbolic dispersion.

1 Introduction Extending the spectral response of semiconductor photodetectors (PDs) beyond the material bandgap while simultaneously enhancing carrier transport represents a fundamental challenge in optoelectronics. Conventional approaches rely on chemical doping [1-4], heterostructure engineering [5-7], or quantum confinement effects [8-11], each introducing complexity and often degrading other device parameters.