Non linear second order effects enhancement in optical Helmholtz resonators
Résumé
Optical Helmholtz resonators are absorbing devices for a single wavelength over a wide spectral range. They are composed of a grating of metallic cavities communicating with the outer medium through a metallic aperture. At resonance, they display zero reflectivity and the incoming electric field is heavily concentrated in this aperture. If the latter is filled with a non linear medium, this huge confinement leads the creation of a great quantity of non linear polarization. Here we seek the best geometry to obtain the highest output efficiency for second harmonic generation and to have very involved wavelength resonant. This situation called mode matching is here achieved thanks to both the grating of resonators and the cavity itself.