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Proceedings Paper

Time-resolved nonlinear optical-holographic techniques for investigation of non-equilibrium carrier dynamics in semiconductors
Author(s): Kestutis Jarašiūnas
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Paper Abstract

A novel metrological approach bridges a dynamic holography and photoelectrical phenomena in semiconductors for monitoring the temporal and spatial non-equilibrium carrier dynamics. Light interference pattern of two coherent picosecond pulses was used to inject spatially modulated carrier pattern, modulate temporally the complex refractive index of a semiconductor, and thus create a light-induced transient diffraction grating (LITG). Recording of a thin grating at interband carrier generation with subsequent probing of spatial and temporal carrier dynamics by a delayed probe beam allowed investigation of various recombination mechanisms, covering linear, surface-limited, and nonlinear (bimolecular and Auger). Decay of LITG at its various spacings provided either the bipolar carrier mobility or minority one in heavily doped layers, diffusivity of degenerate plasma, as well revealed impact of carrier localization and band gap renormalization on carrier transport. Diffraction on thick Bragg gratings, recorded via deep impurity-assisted carrier generation revealed simultaneous index modulation by free-carriers, space-charge electric field, and recharged deep traps, thus enabling access to photoelectric parameters of the compensating centers. Grating decay in multiple quantum well structures (MQWS) provided carrier and spin relaxation rates, electron mobility, in-plane and cross-well transport. Spatial and temporal carrier dynamics in a wide excitation and temperature range is reviewed in a variety of III-nitride compounds (GaN, InGaN, AlGaN), GaAs, CdTe, InP, SiC, diamond films, and MQWS.

Paper Details

Date Published: 21 February 2011
PDF: 17 pages
Proc. SPIE 7937, Ultrafast Phenomena in Semiconductors and Nanostructure Materials XV, 79371W (21 February 2011); doi: 10.1117/12.877108
Show Author Affiliations
Kestutis Jarašiūnas, Vilnius Univ. (Lithuania)

Published in SPIE Proceedings Vol. 7937:
Ultrafast Phenomena in Semiconductors and Nanostructure Materials XV
Kong-Thon Tsen; Jin-Joo Song; Markus Betz; Abdulhakem Y. Elezzabi, Editor(s)

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