Difference Frequency Generation by Quasi-Phase Matching in Periodically Intermixed Semiconductor Superlattice Waveguides

Abstract

Abstract-Wavelength conversion by difference frequency generation is demonstrated in domain-disordered quasi-phase matched waveguides. The waveguide structure consisted of a GaAs/AlGaAs superlattice core that was periodically intermixed by ion-implantation. For quasi-phase matching periods of 3.0-3.8 µm, degeneracy pump wavelengths were found by secondharmonic generation experiments for fundamental wavelengths between 1520-1620 nm in both type-I and type-II configurations. In the difference frequency generation experiments, output powers up to 8.7 nW were generated for the type-I phase matching interaction, and 1.9 nW for the type-II interaction. The conversion bandwidth was measured to be over 100 nm covering the C, L, and U optical communications bands, which agrees with predictions.

Continuous-wave quasi-phase-matched waveguide correlated photon pair source on a III–V chip

“…its asymmetry are in accord with the predicted tuning curves for different frequency generation reported in Ref. 20. There is room for improving the rate of production of the correlated photon pairs.…”

“…QPM by ion-implantation induced QWI has been previously utilized for second harmonic generation (SHG), 18,19 and the birefringence of the superlattice structure has been accounted for in difference frequency generation application. 20 The device consists of a waveguide with a 0.6-lm-thick core layer of 14:14 monolayer GaAs/Al 0.85 Ga 0.15 As superlattice, with buffer layers of 300 nm Al 0.56 Ga 0.44 As on both sides, and cladding layers of 800 nm Al 0.60 Ga 0.40 As. There is an additional 1-lm-thick layer of Al 0.85 Ga 0.15 As beneath the lower cladding in order to avoid field leakage into the GaAs substrate.…”

Optical frequency conversion in integrated devices [Invited]

“…Additional optimization of the QWI process will be necessary to yield the needed band gap shift and Δχ (2) for competitive efficiency. Most recently, we have made the first demonstration of DFG in DD-QPM waveguides between wavelengths in the C-, L-, and U-band [100]. We were able to show both type-I and type-II phase matching based on the polarization configurations of the signal, idler, and pump beams.…”

Hyperentangled photon sources in semiconductor waveguides

“…These structures can be integrated with both active and passive photonic components. Various strategies have been developed to achieve phase matching (PM) in AlGaAs waveguides [14,15]: QPM [16][17][18], form birefringence [19,20], modal phase matching (MPM) [21], counterpropagating modes [22], and the use of Bragg reflection waveguides (BRWs) [23,24]. Techniques to generate polarization entangled photons in AlGaAs waveguides have been theoretically developed [25][26][27] as well as experimentally demonstrated [22,28,29].…”