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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry Van Driel
  • Vol. 26, Iss. 9 — Sep. 1, 2009
  • pp: A79–A89

Guided-wave terahertz spectroscopy of molecular solids [Invited]

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


JOSA B, Vol. 26, Issue 9, pp. A79-A89 (2009)
http://dx.doi.org/10.1364/JOSAB.26.000A79


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Abstract

One of the outstanding problems of terahertz spectroscopy is the measurement of the underlying vibrational spectrum of a molecular solid, where individual vibrational transitions are often merged into broad absorption features by line-broadening processes. We address this problem using the technique of waveguide terahertz time-domain spectroscopy (THz-TDS), whereby a thin polycrystalline molecular film is contained within a single-mode metal parallel plate waveguide. Thin films of the molecular solids cyclotrimethylene trinitramine (RDX explosive) and 4-iodo- 4 -nitrobiphenyl serve to demonstrate the ability of waveguide THz-TDS to resolve previously unseen complex underlying THz vibrational spectra at cryogenic temperatures, with linewidths as narrow as 7 G H z . With such narrow linewidths we are able to demonstrate the measurement of vibrational line-center frequencies to a precision of 1 G H z .

© 2009 Optical Society of America

OCIS Codes
(300.6270) Spectroscopy : Spectroscopy, far infrared
(310.2785) Thin films : Guided wave applications
(300.6495) Spectroscopy : Spectroscopy, teraherz

History
Original Manuscript: March 13, 2009
Manuscript Accepted: April 15, 2009
Published: July 2, 2009

Citation
Joseph S. Melinger, S. Sree Harsha, N. Laman, and D. Grischkowsky, "Guided-wave terahertz spectroscopy of molecular solids [Invited]," J. Opt. Soc. Am. B 26, A79-A89 (2009)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-26-9-A79

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