Two-photon autocorrelation measurements on a single InGaN/GaN quantum dot

Abstract

We report on the use of interferometric autocorrelation measurements to investigate the non-linear absorption processes evident in single InGaN/GaN quantum dots. The near quadratic excitation intensity dependence of the photoluminescence signal in conjunction with the asymmetric collinear autocorrelation trace unambiguously confirms the process as being one involving two photons via an intermediate virtual state. These results highlight the inherently non-linear optical properties of these structures.

Two‐photon absorption induced anti‐Stokes emission in single InGaN/GAN quantum‐dot‐like objects

“…Under TPA, the background signal is suppressed and only a sharp emission peak LC 0 dominates the spectrum. As demonstrated by Collins et al 15 and as illustrated in Fig. 1(c), we assume that TPA occurs via virtual intermediate states.…”

Applications of two-photon processes in semiconductor photonic devices: invited review

“…This technique is based on two-photon transitions in QW IR photodetectors involving two bound subbands and one continuum resonance. In contrast to TPA-based detection, autocorrelation through two-photon luminescence may also be used, as was recently demonstrated for the investigation of the nonlinear absorption characteristics of a single InGaN/GaN quantum dot (QD) [23].…”

Backward stimulated Bragg scattering in multiphoton active CdTexSe1−x quantum dots system

“…[11][12][13][14][15][16][17][18][19][20][21] Both MPA and backward SBgS are intensitydependent nonlinear processes; they can be combined to realize an enhanced optical power limiting performance. [11][12][13][14][15][16][17][18][19][20][21] Both MPA and backward SBgS are intensitydependent nonlinear processes; they can be combined to realize an enhanced optical power limiting performance.…”