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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 26 — Dec. 20, 2010
  • pp: 27238–27250

Temperature dependent characterization of terahertz vibrations of explosives and related threat materials

Joseph S. Melinger, S. Sree Harsha, N. Laman, and D. Grischkowsky  »View Author Affiliations


Optics Express, Vol. 18, Issue 26, pp. 27238-27250 (2010)
http://dx.doi.org/10.1364/OE.18.027238


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Abstract

Waveguide terahertz time-domain spectroscopy (THz-TDS) is used to characterize the temperature dependent vibrational properties of three threat-related materials: 4-amino-dinitrotoluene (4A-DNT), pentaerythritol tetranitrate (PETN), and octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX). These materials are characterized as thin polycrystalline layers deposited in the 50 micron gap of a metal parallel plate waveguide. For each material waveguide THz-TDS at least partially resolves the underlying vibrational spectrum and reveals new features that have not been observed in previous free space measurements of these materials. Strong experimental evidence for a phase transformation is observed for 4A-DNT as the polycrystalline layer on the waveguide surface is cooled to near 200 K. For PETN a highly resolved spectrum containing eleven vibrational lines is observed at 11 K with full-width at half maximum linewidths ranging from 7 GHz to 40 GHz. Based on comparison to measurements in the literature, our PETN measurement suggests that it is possible to produce narrow linewidths from a polycrystalline layer that approach those from a single crystal. Finally, for HMX, a highly resolved vibrational spectrum is measured that is assigned to the metastable gamma polymorph.

© 2010 OSA

OCIS Codes
(130.2790) Integrated optics : Guided waves
(300.6495) Spectroscopy : Spectroscopy, teraherz

ToC Category:
Spectroscopy

History
Original Manuscript: September 22, 2010
Revised Manuscript: October 28, 2010
Manuscript Accepted: November 2, 2010
Published: December 10, 2010

Citation
Joseph S. Melinger, S. Sree Harsha, N. Laman, and D. Grischkowsky, "Temperature dependent characterization of terahertz vibrations of explosives and related threat materials," Opt. Express 18, 27238-27250 (2010)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-26-27238


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