title: Application of emitter-sample hybrid terahertz time-domain spectroscopy to investigate temperature-dependent optical constants of doped InAs.
abstract: 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-1cm-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.
authors.forename: J W
authors.initials: JW
authors.lastname: Han
authors.forename: M S
authors.initials: MS
authors.lastname: Kim
authors.forename: M S
authors.initials: MS
authors.lastname: Song
authors.forename: B Y
authors.initials: BY
authors.lastname: Kang
authors.forename: B K
authors.initials: BK
authors.lastname: Cho
authors.forename: J S
authors.initials: JS
authors.lastname: Lee