Cubic self-action effects in photonic-crystal microcavities

Abstract

Third-order nonlinear optical effects in photonic microcavities are studied. Significant light defocusing in the thin nonlinear microcavity spacer was observed. The polarization self-action effect was detected, when the large nonlinear polarization rotation angle arises when exciting the microcavity mode, being proportional to the radiation intensity.

Borrmann effect in photonic crystals: Nonlinear optical consequences

“…Similar measurements were carried out at the angles of incidence from 0 to 30, corresponding to wavelengths from 1064 to 1090 nm. The typical n 2 values (∆n = n 2 I, where I is the radiation intensity) in this spectral range were (3÷7)•10 −8 cm 2 /W, which are higher than a similar value for magnetophotonic microcavities with the: (Ti 2 O 5 /SiO 2 ) 5 /Bi:YIG/(Ti 2 O 5 /SiO 2 ) 5 structure [6]. Assuming that the nonlinear susceptibility χ…”

“…Photonic crystals, i.e., microstructures with the periodic modulation of the refractive index that have a photonic gap, are actively studied [1], [2]. Various nonlinear optical effects such as the generation of the second- [3], [4] and third-optical harmonics [5] and self-action (selffocusing) radiation effects [6] were observed in photonic crystals.…”

“…The z-scan method was used to analyze the cubic selfaction effects at the probe radiation wavelength. The method proposed in [13] is similar to that used in [6]. Radiation from a Nd 3+ laser (a wavelength of 1064 nm, a pulse duration of 15 ns, a repetition rate of 25 Hz, and a pulsed power density up to 10 MW/cm 2 ) was focused on a sample by a lens with a focal length of 6 cm.…”

Vertical hybrid microcavity based on a polymer layer sandwiched between porous silicon photonic crystals

“…14,17 Large values of the effective third-order nonlinearity observed in the experiments are caused evidently by the light localization and photon trapping in the MC structure. As discussed in, 18 the enhancement coefficient in a vertical MC can reach the value of Q 2 , Q being about 45 in our samples. The quadratic dependence on Q arises from two phenomena, namely, because of the local electromagnetic field enhancement in the MC spacer and of a multipass character of the beam propagation inside the structure.…”