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

Abstract

One-dimensional anisotropic photonic crystals and microcavities based on birefringent porous silicon are fabricated. The reflectance spectra demonstrate the presence of photonic band gap and microcavity modes with spectral positions tunable upon the sample azimuthal rotation around its normal and/or rotation of polarization plane of incident light. Simultaneous enhancement of second- and third-harmonic generation at the photonic band-gap edge due to the phase matching is observed. The angular positions of the second- and third-harmonic peaks are controllable via the anisotropy of the refractive indices of porous silicon layers.

Silicon Nanocrystals in Porous Silicon and Applications

“…Second-and third-harmonic generation in birefringent PSi single layer and photonic crystals has been proposed [181][182][183]. Photonic structures can also be built laterally.…”

“…Using the high sensitivity of the resonance of a PSi microcavity, a switching function becomes available by monitoring the transmission or reflection of light at the resonance wavelength of the cavity. Second-and third-harmonic generation in birefringent PSi single layer and photonic crystals has been proposed [181][182][183]. The study of nonlinearities in PSi (porosity up to 70%) optical waveguides at 1550 nm showed that two-photon absorption and self-phase modulation coefficients are comparable to those of bulk Si, whereas free-carrier absorption and dispersion are significantly faster and stronger in PSi [206].…”

Enhanced Raman scattering in multilayer structures of porous silicon

“…The adjustment of the formation process of por-Si MLS offers possibilities to prepare high-quality optical mirrors with desirable reflection and dispersion. [2] Raman scattering, [3,4] secondand third-harmonic generations, [5,6] and photonic crystal properties [2,7,8] of porSi are well explored and these data show the possibilities of tailoring the optical and nonlinear optical properties of Si-based nanocomposites. MLSs based on por-Si can be considered as one-dimensional photonic crystals to control a light stream inside a chip and the radiative processes within the photonic bandgap (PBG) or in the area of microresonator modes.…”

Optical Effects Accompanying the Dynamical Bragg Diffraction in Linear 1D Photonic Crystals Based on Porous Silicon

“…This leads to such well known effects as slow light, i.e., a substantial decrease of the light group velocity [3], spatial and spectral light localization [4], the decrease of the optical excitation threshold of PhC based laser structures [5,6]. An important property of photonic crystals is also a manifold amplification of the efficiency of the nonlinear-optical effects such as harmonics' generation [7,8] and nonlinear magneto-optical effects [9]. When the nonlinear interaction of the pulsed laser radiation with the PhC structure is sufficient, the so-called gap solitons can exist within the photonic crystals [10,11].…”