Multidimensional coherent photocurrent spectroscopy of a semiconductor nanostructure

• DOI: 10.1364/oe.21.028617
• Publication Date: 2013-11-13T15:57:05Z
• Authors: Gaël Nardin; Travis M. Autry; Kevin L. Silverman; S. T. Cundiff
• Keywords: Photocurrent; SIGNAL (programming language); Modulation (music)

Multidimensional Coherent Optical Photocurrent Spectroscopy (MD-COPS) is implemented using unstabilized interferometers.Photocurrent from a semiconductor sample generated sequence of four excitation pulses in collinear geometry.Each pulse tagged with unique radio frequency through acousto-optical modulation ; the Four-Wave Mixing (FWM) signal then selected domain.The interference an auxiliary continuous wave laser, which sent same interferometers as pulses, used to synthesize reference frequencies for lock-in detection photocurrent FWM signal.This scheme enables partial compensation mechanical fluctuations setup, achieving sufficient phase stability without need active stabilization.The method intrinsically provides both real and imaginary parts function inter-pulse delays.This subsequently Fourier transformed create multi-dimensional spectrum.Measurements made on excitonic resonance double InGaAs quantum well embedded p-i-n diode demonstrate technique.