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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 10 — May. 19, 2014
  • pp: 12475–12485

Ultra-broadband THz time-domain spectroscopy of common polymers using THz air photonics

Francesco D’Angelo, Zoltán Mics, Mischa Bonn, and Dmitry Turchinovich  »View Author Affiliations


Optics Express, Vol. 22, Issue 10, pp. 12475-12485 (2014)
http://dx.doi.org/10.1364/OE.22.012475


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Abstract

Terahertz-range dielectric properties of the common polymers low-density polyethylene (LDPE), cyclic olefin/ethylene copolymer (TOPAS®), polyamide-6 (PA6), and polytetrafluoroethylene (PTFE or Teflon®) are characterized in the ultra-broadband frequency window 2-15 THz, using a THz time-domain spectrometer employing air-photonics for the generation and detection of single-cycle sub-50 fs THz transients. The time domain measurements provide direct access to both the absorption and refractive index spectra. The polymers LDPE and TOPAS® demonstrate negligible absorption and spectrally-flat refractive index across the entire spectroscopy window, revealing the high potential of these polymers for applications in THz photonics such as ultra-broadband polymer-based dielectric mirrors, waveguides, and fibers. Resonant high-frequency polar vibrational modes are observed and assigned in polymers PA6 and PTFE, and their dielectric functions in the complete frequency window 2-15 THz are theoretically reproduced. Our results demonstrate the potential of ultra-broadband air-photonics-based THz time domain spectroscopy as a valuable analytic tool for materials science.

© 2014 Optical Society of America

OCIS Codes
(160.5470) Materials : Polymers
(320.7150) Ultrafast optics : Ultrafast spectroscopy
(300.6495) Spectroscopy : Spectroscopy, teraherz

ToC Category:
Terahertz Optics

History
Original Manuscript: March 17, 2014
Revised Manuscript: May 9, 2014
Manuscript Accepted: May 9, 2014
Published: May 15, 2014

Citation
Francesco D’Angelo, Zoltán Mics, Mischa Bonn, and Dmitry Turchinovich, "Ultra-broadband THz time-domain spectroscopy of common polymers using THz air photonics," Opt. Express 22, 12475-12485 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-10-12475


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