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The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs.

Strathprints serves world leading Open Access research by the University of Strathclyde, including research by the Strathclyde Institute of Pharmacy and Biomedical Sciences (SIPBS), where research centres such as the Industrial Biotechnology Innovation Centre (IBioIC), the Cancer Research UK Formulation Unit, SeaBioTech and the Centre for Biophotonics are based.

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GaN directional couplers for integrated quantum photonics

Yanfeng, Zhang and McKnight, Loyd James and Engin, Erman and Watson, Ian and Cryan, Martin J. and Gu, Erdan and Thompson, Mark G. and Calvez, Stephane and O’Brien, Jeremy L. and Dawson, Martin (2011) GaN directional couplers for integrated quantum photonics. Applied Physics Letters, 99 (16). ISSN 0003-6951

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Abstract

Large cross-section GaN waveguides are proposed as a suitable architecture to achieve integrated quantum photonic circuits. Directional couplers with this geometry have been designed with aid of the beam propagation method and fabricated using inductively coupled plasma etching. Scanning electron microscopy inspection shows high quality facets for end coupling and a well defined gap between rib pairs in the coupling region. Optical characterization at 800 nm shows single-mode operation and coupling-length-dependent splitting ratios. Two photon interference of degenerate photon pairs has been observed in the directional coupler by measurement of the Hong-Ou-Mandel dip.