title: Tunable continuous-wave terahertz generation/detection with compact 1.55 μm detuned dual-mode laser diode and InGaAs based photomixer.
abstract: We demonstrate a tunable continuous-wave (CW) terahertz (THz) homodyne system with a novel detuned dual-mode laser diode (DML) and low-temperature-grown (LTG) InGaAs photomixers. The optical beat source with the detuned DML showed a beat frequency tuning range of 0.26 to over 1.07 THz. Log-spiral antenna integrated LTG InGaAs photomixers are used as THz wave generators and detectors. The CW THz radiation frequency was continuously tuned to over 1 THz. Our results clearly show the feasibility of a compact and fast scanning CW THz spectrometer consisting of a fiber-coupled detuned DML and photomixers operating in the 1.55-μm range.
authors.affiliation: THz Photonics Creative Research Center, ETRI, Daejeon 305-700, Korea.
authors.forename: Namje
authors.initials: N
authors.lastname: Kim
authors.forename: Sang-Pil
authors.initials: SP
authors.lastname: Han
authors.forename: Hyunsung
authors.initials: H
authors.lastname: Ko
authors.forename: Young Ahn
authors.initials: YA
authors.lastname: Leem
authors.forename: Han-Cheol
authors.initials: HC
authors.lastname: Ryu
authors.forename: Chul Wook
authors.initials: CW
authors.lastname: Lee
authors.forename: Donghun
authors.initials: D
authors.lastname: Lee
authors.forename: Min Yong
authors.initials: MY
authors.lastname: Jeon
authors.forename: Sam Kyu
authors.initials: SK
authors.lastname: Noh
authors.forename: Kyung Hyun
authors.initials: KH
authors.lastname: Park
mesh_terms: D004867:Equipment Design; D006801:Humans; D007834:Lasers; D054023:Lasers, Semiconductor; D008027:Light; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning / Q000379:methods; D012666:Semiconductors; D055053:Terahertz Radiation; D055068:Terahertz Spectroscopy / Q000379:methods*; D013997:Time Factors