Figure 3
From: Mid-infrared photon sensing using InGaN/GaN nanodisks via intersubband absorption

Momentum matrix element of transitions from various initial states to higher excited states by (a) x-polarized and (b) y-polarized light. (c) In-plane momentum matrix element and energy distribution for ground state to higher excited state transition, (d) intraband absorption with 4 meV FWHM for a In0.3Ga0.7N nanodisk with a diameter of 20 nm. Intraband absorption energy distribution for various (e) indium composition and (f) diameter of the nanodisk.