Journal
OPTICS EXPRESS
Volume 22, Issue 10, Pages 12475-12485Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.22.012475
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Funding
- Danish Council for Independent Research-Technology and Production Sciences (FTP project ALFIE)
- EU Career Integration Grant [334324 LIGHTER]
- Max Planck Society
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Terahertz-range dielectric properties of the common polymers low-density polyethylene (LDPE), cyclic olefin/ethylene copolymer (TOPAS (R)), polyamide-6 (PA6), and polytetrafluoroethylene (PTFE or Teflon (R)) 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 (R) 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. (C) 2014 Optical Society of America
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