Abstract-Application of emitter–sample hybrid terahertz time-domain spectroscopy to investigate temperature-dependent optical constants of doped InAs

J. W. Han, M. S. Kim, M. S. Song, B. Y. Kang, B. K. Cho, and J. S. Lee

https://www.osapublishing.org/ao/abstract.cfm?uri=ao-56-9-2529&origin=search

We investigate temperature-dependent carrier dynamics of InAs crystal by using reflection-type terahertz time-domain spectroscopy, particularly with a recently developed emitter–sample hybrid structure. We successfully obtain the optical conductivity in a terahertz frequency of bulk InAs whose dc conductivity is in the range of 100–150  Ω−1 cm−1$100–150{\mathrm{\Omega }}^{-1}{\mathrm{cm}}^{-1}$. We find that both real and imaginary parts of the optical conductivity can be fit well with the simple Drude model, and the free-carrier density and the scattering rate obtained from the fit are in good agreement with corresponding values obtained by using other techniques, such as the Hall measurement and the dc-resistivity measurement. These results clearly demonstrate that the proposed technique of adopting the emitter–sample hybrid structure can be exploited to determine temperature-dependent optical constants in a reflection geometry and hence to investigate electrodynamics of bulk metallic systems.

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