In this paper we show that by suitably tailoring the dispersion characteristics of a Bragg reflection waveguide (BRW) mode, it is possible to achieve efficient photon pair generation over a large pump bandwidth while maintaining narrow signal bandwidth. The structure proposed consists of a high index core BRW with a periodically poled GaN core and periodically stratified cladding made up of alternate layers of Al0.02Ga0.98N and Al0.45Ga0.55N. Such photon-pair generators should find applications in realizing compact and stable sources for quantum information processing.
@article{arxiv.0904.1791,
title = {Increased pump acceptance bandwidth in spontaneous parametric downconversion process using Bragg reflection waveguides},
author = {K. Thyagarajan and R. Das and O. Alibart and M. de Micheli and D. B. Ostrowsky and S. Tanzilli},
journal= {arXiv preprint arXiv:0904.1791},
year = {2009}
}