Intersubband gain without global inversion through dilute nitride band engineering

Abstract

We investigate the possibility of interconduction band gain without global inversion by engineering the conduction band effective masses so that the upper lasing subband has an effective mass considerably smaller than the lower lasing subband that could not be obtained in conventional III-V materials. We recover the expected dispersive gain shape for similar masses and contrasting results if the effective masses characterizing the relevant subbands are very different.

TERA-MIR radiation: materials, generation, detection and applications II

“…Oriaku and M.F. Pereira deliver an efficient approximation to the complex many body problem of luminescence in semiconductors to the case of mid infrared luminescence of dilute nitrides has been delivered by The results are in very good agreement with recent mid infrared experimental data from teams in our Network [6]. This theory is obtained after systematic simplifications of a more complete optical response for semiconductor materials, obtained by self-consistent evaluation of Manybody Nonequilibrium Green's Functions (NEGF).…”

Anisotropy and nonlinearity in superlattices II

“…Efficient numerical methods used here have been successfully applied to both inter-subband (Pereira and Faragai 2014;Pereira 2007Pereira , 2008Pereira , 2011Pereira et al 2007;Pereira and Tomić 2011) and inter-band transitions (Grempel et al 1996;Pereira et al 1994;Pereira and Henneberger 1997;Chow et al 1992) in quantum wells and superlattices. For completeness, we repeat here the main equations of Pereira (2016) for a guide to the reader, by starting with the interband polarization that has been used to describe superlattices as an effective anisotropic 3D material (Pereira 1995),…”

TERA-MIR radiation: materials, generation, detection and applications

“…We will stimulate the development of more efficient simulation tools (Schmielau and Pereira 2009a,b;David 2012) and Round Robin actions for a systematic comparison of theory and experiments (Pereira et al 2007). Thus out of the box solutions for THz QCLs such as lasing without inversion (Pereira 2008;Pereira and Tomić 2011) as well as alternative generation methods will be investigated. From the detection point of view, more advanced solutions of e.g.…”