Oscillator Strength and Absorption Cross-section of Core-Shell Triangular Quantum Wire for Intersubband Transition

Abstract

Oscillator strength and absorption cross-section of core-shell triangular quantum wire is computed for intersubband optical transition between ground state and first excited state. Kane type band nonparabolicity of first order is considered to study the shift of cross-section peak with incident radiation, and also of the oscillator strength with structural parameters. Results are compared with that obtained from parabolic overestimation. Results show that both oscillator strength and peak magnitude of absorption cross-section decreases with increasing dimension, and the rate is significant when nonparabolic dispersion relation is taken into account. Findings are important for designing optical emitter/detector using coreshell triangular quantum wire. IntroductionElectronic and photonic properties of semiconductor quantum structures have attracted the interest of both theoretical and experimental researchers in the last few years, precisely due to the rapid growth of fabrication procedure of lower dimension devices. Quantum well, wire and dot are the prime candidates among nanostructures, where carrier motion can be confined along one, two or three dimensions, leading to quantized energy states. Different geometrical shapes [1,2] and material compositions [3,4]