Time resolved spectroscopy of n-type InAsP films

ORAL

Abstract

In this study, we employed ultrafast Time Resolved Differential Reflectivity (TRDR) and ultrafast time resolved Magneto-optic Kerr Effect (MOKE) on InAsxP1-x ternary alloy. In recent years, InAsxP1-x ternary alloys have attracted extensive attention due to the immense prospect for various optoelectronic applications including optical telecommunication, broadband photodetectors, mid-IR lasers, and also quantum communication devices. 1,2 As the switching rates in devices are pushed to higher frequencies in optoelectronic and spintronic devices, it is required to perform comprehensive studies of the carrier and spin relaxation dynamics in semiconductors on a femto-second timescale. Here we report carrier and spin dynamics of n-type InAsxP1-x films in a broad optical region (700 nm and 1000 nm). Also, we observed the generation of coherent oscillations which could be related to photo-induced coherent acoustic phonons. The InAsxP1-x films are ~1.2 micron thick grown on semi-insulating InP (001) wafers and the carrier concentrations are estimated to be 1x1017 cm--3.
1- Journal of Applied Physics 115, 193503 (2014).
2- Applied Physics Letters 102 (22), 222102 (2013).

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Presenters

  • Rathsara R Herath Mudiyanselage

    Virginia Tech

Authors

  • Rathsara R Herath Mudiyanselage

    Virginia Tech

  • Brenden A Magill

    Virginia Tech, Physics, Virginia Tech

  • Giti Khodaparast

    Virginia Tech, Physics, Virginia Tech

  • Joseph A Spencer

    Virginia Tech

  • Kiara McMillan

    Virginia Tech

  • Sukgeun Choi

    University of California - Santa Barbara, University of California Santa Barbara

  • Chris Palmstrom

    University of California, Santa Barbara, University of California - Santa Barbara, University of California Santa Barbara, Electrical & Computer Engineering, University of California, Santa Barbara, ECE and Materials, University of California, Santa Barbara, Dept. of ECE, University of California Santa Barbara, Materials Department, University of California, Santa Barbara, Materials Engineering, University of California, Santa Barbara, University of California Santa Barbara, Materials Engineering, Departments of Electrical and Computer Engineering and Materials, University of California, Santa Barbara