Backward difference frequency generation in an AlGaAs waveguide

Abstract

We report on the observation of a noncollinear difference frequency generation at 1.55μm in an AlGaAs multilayer waveguide. In such three-wave-mixing process, which occurs between a transverse pump beam and two counterpropagating guided modes, the phase matching parameter is the angle of incidence of the pump and the peak efficiency is 3.5×10−6W−1. This innovative device is suitable as a tunable, narrow-bandwidth source of counterpropagating twin photons for quantum information.

Semiconductor Waveguide Source of Counterpropagating Twin Photons

“…Here the uncertainties are mainly due to the uncertainty on two inputs of our simulations: the experimental values of the incident angle (0:05 ) and of the pump wavelength (0:2 nm). Such a good agreement reflects the robustness of the structure with respect to the tolerances on the ridge size (width and height) and to the fluctuations (thickness and composition of the layers) in the epitaxial process [18]. Apart from the above experimental uncertainties, the intrinsic full width at half maximum of the generated spectrum has been accurately measured by difference frequency generation and was found to be equal to 0.15 nm.…”

Parametric fluorescence in semiconductor waveguides

“…For these two reasons, two preliminary measurements were carried out on the same sample before the PF experiment, following the schemes of Fig. 11: a surface-emitted sum frequency generation experiment (SESFG) and a backward DFG experiment (BDFG) [40]. SESFG (Fig.…”

AlGaAs waveguide generation of counterpropagating twin photons

“…8 SESFG is the reverse of the PF process of Fig. 1a: two counter-propagating guided modes of wavelengths λ i and λ s , with respective polarizations TE and TM, generate a sum frequency field at wavelength λ p , which radiates away from the waveguide.…”