title: Strongly enhanced THz emission caused by localized surface charges in semiconducting Germanium nanowires.
abstract: A principal cause of THz emission in semiconductor nanostructures is deeply involved with geometry, which stimulates the utilization of indirect bandgap semiconductors for THz applications. To date, applications for optoelectronic devices, such as emitters and detectors, using THz radiation have focused only on direct bandgap materials. This paper reports the first observation of strongly enhanced THz emission from Germanium nanowires (Ge NWs). The origin of THz generation from Ge NWs can be interpreted using two terms: high photoexcited electron-hole carriers (Δn) and strong built-in electric field (Eb) at the wire surface based on the relation . The first is related to the extensive surface area needed to trigger an irradiated photon due to high aspect ratio. The second corresponds to the variation of Fermi-level determined by confined surface charges. Moreover, the carrier dynamics of optically excited electrons and holes give rise to phonon emission according to the THz region.
authors.affiliation: Department of Physics and Applied Physics, Yonsei University, Seoul 120-749, Korea.
authors.forename: Woo-Jung
authors.initials: WJ
authors.lastname: Lee
authors.forename: Jin Won
authors.initials: JW
authors.lastname: Ma
authors.forename: Jung Min
authors.initials: JM
authors.lastname: Bae
authors.forename: Kwang-Sik
authors.initials: KS
authors.lastname: Jeong
authors.forename: Mann-Ho
authors.initials: MH
authors.lastname: Cho
authors.forename: Chul
authors.initials: C
authors.lastname: Kang
authors.forename: Jung-Sub
authors.initials: JS
authors.lastname: Wi