Journal Article bound states in the continuum nonlinear optics thermal diffusion thermal functional materials 2D materials 2D van der Waals heterostructures Fabry‐Pérot microcavity Research Support, Non-U.S. Gov't all-dielectric metasurface amorphous deformation anisotropy anti-Hermiticity band gap carbon nanotubes devices etchless photonic cavity excitons exciton‐exciton scattering field-effect transistor harmonic generation higher-order topological insulators indium selenide lasing linear polarization metal microstructure mid infrared mid-infrared mid-infrared photodetectors