AlGaAs Fano resonances GaAs nanowires GeSn Microelectromechanical systems Mie scattering Nanophotonics Research Technology: general issues absorption coefficients adaptive imaging amplifiers cascaded spontaneous parametric down-conversion (SPDC) coherent perfect absorption complex optical systems electric field epsilon-near-zero media extrinsic chirality fiber optics four-wave mixing guided-mode resonance harmonic generation intersubband nonlinear optics kerr nonlinearity lasers light-with-light modulation microphotonics modulation instability nanocrystals nanophotonics