title: Efficient photoconductive terahertz source using line excitation.
abstract: We report significant improvement in terahertz (THz) power and efficiency using photoconductive sources by use of a spatially extended line source excitation and the trap enhanced field effect that occurs in sources made on semi-insulating GaAs. The combination of high electric fields and reduced screening effects allows 10 microW of THz power to be generated with 14 mW of absorbed optical power, demonstrating nearly 0.1% optical-to-THz conversion efficiency.
authors.affiliation: School of Electrical and Computer Engineering, Georgia Institute of Technology, 777 Atlantic Drive, Atlanta, Georgia 30332-0269, USA.
authors.forename: Joong H
authors.initials: JH
authors.lastname: Kim
authors.forename: Arup
authors.initials: A
authors.lastname: Polley
authors.forename: Stephen E
authors.initials: SE
authors.lastname: Ralph