Observation of 1.798 μm intersubband transition in InGaAs/AlAs pseudomorphic quantum well heterostructures

Abstract

The well-width dependence of intersubband transition energies in InGaAs/AlAs pseudomorphic quantum well structures has been studied, and the shortest intersubband wavelength reported to date, 1.798 μm, has been observed for 6 monolayer wells. Both transverse electric and transverse magnetic optical polarizations are absorbed, with an energy splitting of 67 meV between them.