The nonlinear susceptibility is a measure of a material's nonlinear response to an applied electric field. It determines the strength of the nonlinear effects and is related to the crystal's symmetry ...

Sunlight sparkling on water evokes the rich phenomena of liquid–light interaction, spanning spatial and temporal scales. While the dynamics of liquids have fascinated researchers for decades, the rise ...

In everyday life, many systems obey simple, linear rules: if you pull twice as hard on a spring, it stretches twice as far. However, when we introduce very large forces or complicated interactions, ...