Regular Article

Guided wave analysis of fractional TIR-QPM-based broadband SHG in the MIR region in a reverse tapered isotropic slab

National Institute of Technology Agartala, Agartala, Tripura, India

^* e-mail: bhaswatimtech@gmail.com

Received: 11 June 2018
Revised: 26 September 2018
Accepted: 14 November 2018
Published online: 19 December 2018

Abstract

This paper is a numeric-analytical work on generating second harmonic by using guided wave optics in lieu of plane ray optics for the reason that guided wave optics gives a more accurate representation of the nonlinear optical phenomena. In this analysis we have taken a reverse tapered isotropic semiconductor slab where the effects of the nonlinear law of reflection are minimized. Other lossy factors like surface roughness, Goos-Hänchen shift and absorption losses are also incorporated in the computer-aided simulation results. The effects of the parametric changes are also explained in the results section to give a better perspective of the whole analysis. The results are obtained in terms of efficiency and 3 dB bandwidth and are superior compared to tapered structure of semiconductor slab.