We have experimentally demonstrated broadband tuneable four-wave mixing in AlGaAs nanowires with the widths ranging between 400 and 650 nm and lengths from 0 to 2 mm. We performed a detailed experimental study of the parameters influencing the FWM performance in these devices (experimental conditions and nanowire dimensions). The maximum signal-to-idler conversion range was 100 nm, limited by the tuning range of the pump source. The maximum conversion efficiency, defined as the ratio of the output idler power to the output signal power, was -38 dB. In support of our explanation of the experimentally observed trends, we present modal analysis and group velocity dispersion numerical analysis. This study is what we believe to be a step forward towards realization of all-optical signal processing devices.

A quantum dot based bright source of entangled photon pairs operating at 53 K Nonlinear AlGaAs waveguide for the generation of counterpropagating twin photons in the telecom range J. Appl. Phys. 98, 063103 (2005); 10.1063/1.2058197Continuous-wave second-harmonic generation in modal phase matched semiconductor waveguides

Abstract:We demonstrate experimentally the frequency-time entanglement of photon pairs produced in a CW-pumped quasi-phased-matched AlGaAs superlattice waveguide. A visibility of % without background subtraction has been achieved, which corresponds the violation of Bell inequality by 52 standard deviations. [6][7][8] have recently attracted attention as such platforms allow for a monolithically integrated entangled photon source with a pump laser fabricated on the same substrate [9]. Specifically, the (Al)GaAs platform for a PPS at telecom wavelengths (~1550 nm) has a number of inherent advantages over alternative approaches. First, there exists a mature fabrication technology for this platform. Second, (Al)GaAs possesses a relatively large second-order optical nonlinearity, 

Trapping broadband electromagnetic radiation over a subwavelength grating, provides new opportunities for hyperspectral light-matter interaction on a nanometer scale. Previous efforts have shown rainbow-trapping is possible on functionally graded structures. Here, we propose groove width as a new gradient parameter for designing rainbow-trapping gratings and define the range of its validity. We articulate the correlation between the width of narrow grooves and the overlap or the coupling of the evanescent surface plasmon fields within the grooves. In the suitable range (≲150 nm), this width parameter becomes as important as other known parameters such as groove depth and materials composition, but tailoring groove widths is remarkably more feasible in practice. Using groove width as a design parameter, we investigate rainbow-trapping gratings and derive an analytical formula by treating each nano-groove as a plasmonic waveguide resonator. These results closely agree with numerical simulations.

No abstract