Berlin 2001 – scientific programme
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Q: Quantenoptik
Q 23: Poster: Application of Short Pulses
Q 23.3: Poster
Thursday, April 5, 2001, 12:30–15:00, AT2
Characterization of Plastic Materials in the Terahertz Frequency Range
— •Jianxin Zhao and Hermann Harde —
Universität der Bundeswehr Hamburg
Lasertechnik und Werkstoffkunde, Germany
We have used the powerful technique of THz time-domain
spectroscopy to characterize plastics (plastomeres and duromeres). Herewith
high-precision continuous spectra of the absorption coefficient and
refractive index are provided. The distinct higher absorption of the polar
materials polyvinylchlorid and polyamid at THz-frequencies is compared with
the nonpolar polymers polytetrafluorethylen (Teflon) and polyethylen. The
measurements are compared with calculations based on the Debye theory and
the new molecular response theory1,2 to evaluate the relevant
parameters describing the molecular polarization.
1. H.
Harde, R. A. Cheville, D. Grischkowsky, J. Phys. Chem. A
101, 3646-3660
(1997)
2. H. Harde, R. A. Cheville, D. Grischkowsky, J. Opt. Soc.
Am. B
14, 3282-3293 (1997)