Second- and third-harmonic generation in birefringent photonic crystals and microcavities based on anisotropic porous silicon

Abstract

The technique of fabrication of one-dimensional anisotropic photonic crystals and microcavities based on porous silicon with birefringence has been developed. The spectra of linear reflectance demonstrate presence of photonic band gap (PBG) and microcavity mode located in the center of PBG. Their spectral position is tuned upon the sample rotation around its normal and/or rotation of incident light polarization plane. Enhancement of secondand third-harmonic generation for the fundamental wavelength resonant to the long wavelength edge of PBG due to phase matching is observed by angular spectroscopy. The angular positions of second-and third-harmonic peaks are determined by porous silicon dispersion and shifted for different polarisation of the fundamental wave due to the dielectric function anisotropy.

Coherent anti-Stokes Raman scattering in a Fabry-Perot cavity: A theoretical study

“…The weak or strong coupling between the cavity and the emitters leads to the enhancement/inhibition of the spontaneous emission [14][15][16][17][18][19] or Rabi flipping [20,21]. Enhancement of scattering processes such as linear [22] and nonlinear [23] Raman scattering, second [24] or third [25,26] harmonic generation, and nonresonant four-wave mixing [27] by Fabry-Perot cavities was also successfully demonstrated. Spontaneous emission radiation pattern modification has been used to improve the extraction of light in semiconductor devices [28,29].…”

Efficient bidirectional optical harmonics generation in three-dimensional photonic crystals

“…The angular dependence of SH nonlinear diffraction has a peak at θ in ¼ 44°with the half-width at half-maximum (HWHM) Δθ NL ¼ 5:5°AE 0:3°. Recently, SHG enhancement was observed in the specular direction at the photonic bandgap edge in one-dimensional (1D) and 3D photonic crystals [10,[16][17][18][19][20][21] and at the microcavity mode of 1D photonic crystals [22][23][24]. The SHG enhancement in 1D photonic crystals is associated with quasi-phase matching condition fulfillment due to the media periodicity.…”