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Title: Coherent phonon spectroscopy of non-fully symmetric modes using resonant terahertz excitation

We use intense terahertz (THz) frequency electromagnetic pulses generated via optical rectification in an organic crystal to drive vibrational lattice modes in single crystal Tellurium. The coherent modes are detected by measuring the polarization changes of femtosecond laser pulses reflecting from the sample surface, resulting in a phase-resolved detection of the coherent lattice motion. We compare the data to a model of Lorentz oscillators driven by the near-single-cycle broadband THz pulse. The demonstrated technique of optically probed coherent phonon spectroscopy with THz frequency excitation could prove to be a viable alternative to other time-resolved spectroscopic methods like standard THz time domain spectroscopy.
Authors:
; ;  [1] ;  [2] ;  [1] ;  [3]
  1. Institute for Quantum Electronics, Physics Department, ETH Zurich, CH-8093 Zurich (Switzerland)
  2. The Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, D-22761 Hamburg (Germany)
  3. (Switzerland)
Publication Date:
OSTI Identifier:
22489185
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 9; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; DETECTION; ELECTROMAGNETIC PULSES; EXCITATION; LASERS; MONOCRYSTALS; OSCILLATORS; PHONONS; POLARIZATION; SPECTROSCOPY; SURFACES; SYMMETRY; TELLURIUM; TIME RESOLUTION