Abstract

We present an analytical model that shows that reflection from a rough surface causes a Gaussian frequency roll-off for the spectral magnitude of a terahertz wave and reduces the signal-to-noise ratio of terahertz time-domain spectroscopy. The parameter that determines the width of the frequency roll-off is the standard deviation of the surface height distribution. Measurements of terahertz waves reflected from copper powder samples provide experimental evidence for this effect.

© 2006 Optical Society of America

Characterization of roughness parameters of metallic surfaces using terahertz reflection spectra

Arunkumar Jagannathan, Andrew J. Gatesman, and Robert H. Giles
Opt. Lett. 34(13) 1927-1929 (2009)

Dynamic range in terahertz time-domain transmission and reflection spectroscopy

Peter Uhd Jepsen and Bernd M. Fischer
Opt. Lett. 30(1) 29-31 (2005)

Measurement of roughness based on the Talbot effect in reflection from rough surfaces

Masoomeh Dashtdar, Ali Mohammadzade, and S. Mohammad-Ali Hosseini-Saber
Appl. Opt. 54(16) 5210-5215 (2015)

Uncertainty in terahertz time-domain spectroscopy measurement

Withawat Withayachumnankul, Bernd M. Fischer, Hungyen Lin, and Derek Abbott
J. Opt. Soc. Am. B 25(6) 1059-1072 (2008)

Photoexcited GaAs surfaces studied by transient terahertz time-domain spectroscopy

Michael Schall and Peter Uhd Jepsen
Opt. Lett. 25(1) 13-15 (2000)