title: On-chip picosecond pulse detection and generation using graphene photoconductive switches.
abstract: We report on the use of graphene for room temperature on-chip detection and generation of pulsed terahertz (THz) frequency radiation, exploiting the fast carrier dynamics of light-generated hot carriers, and compare our results with conventional low-temperature-grown gallium arsenide (LT-GaAs) photoconductive (PC) switches. Coupling of picosecond-duration pulses from a biased graphene PC switch into Goubau line waveguides is also demonstrated. A Drude transport model based on the transient photoconductance of graphene is used to describe the mechanism for both detection and generation of THz radiation.
authors.affiliation: School of Electronic and Electrical Engineering, University of Leeds , Woodhouse Lane, Leeds LS2 9JT, United Kingdom.
authors.forename: Nicholas
authors.initials: N
authors.lastname: Hunter
authors.forename: Alexander S
authors.initials: AS
authors.lastname: Mayorov
authors.forename: Christopher D
authors.initials: CD
authors.lastname: Wood
authors.forename: Christopher
authors.initials: C
authors.lastname: Russell
authors.forename: Lianhe
authors.initials: L
authors.lastname: Li
authors.forename: Edmund H
authors.initials: EH
authors.lastname: Linfield
authors.forename: A Giles
authors.initials: AG
authors.lastname: Davies
authors.forename: John E
authors.initials: JE
authors.lastname: Cunningham
keywords: GaAs; Goubau line; Graphene; THz detection; on-chip; photoconductive switch