Constraint-free wavelength conversion supported by giant optical refraction in a 3D perovskite supercrystal

Ludovica Falsi, Luca Tartara, Fabrizio Di Mei +8

Nonlinear response in a material increases with its index of refraction as $n^4$. Commonly, $n\sim$ 1 so that diffraction, dispersion, and chromatic walk-off limit nonlinear scatt…