THz emission from coherently controlled photocurrents in GaAs
- 20 December 1999
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 75 (25) , 3959-3961
- https://doi.org/10.1063/1.125531
Abstract
We report broadband terahertz radiation from ballisticphotocurrentsgenerated via quantum interference of one- and two-photon absorption in low-temperature-grown and semi-insulating GaAs at 295 K. For 90 fs, 1550 and 775 nm optical pulses, we obtain phase-controllable near-single cycle 4 THz radiation. Higher frequency THz emission should be achievable with shorter pulses. At a 250 kHz repetition rate and average powers of 10 mW (1550 nm) and 400 μ W (775 nm), we measure 3 nW of THz power, limited mainly by phase walkoff of the optical beams within the 1.5- μ m-thick sample and collection efficiency.Keywords
This publication has 14 references indexed in Scilit:
- Quantum interference control of electrical currents in GaAsIEEE Journal of Quantum Electronics, 1998
- Observation of Coherently Controlled Photocurrent in Unbiased, Bulk GaAsPhysical Review Letters, 1997
- Coherent Control of Photocurrent Generation in Bulk SemiconductorsPhysical Review Letters, 1996
- Generation of ultrabroadband femtosecond pulses in the mid-infrared by optical rectification of 15 fs light pulses at 100 MHz repetition rateApplied Physics Letters, 1995
- GENERATION OF THE TERAHERZ RADIATION USING χ(3) IN SEMICONDUCTORJournal of Nonlinear Optical Physics & Materials, 1995
- Generation of high-power sub-single-cycle 500-fs electromagnetic pulsesOptics Letters, 1993
- Terahertz radiation induced by subband-gap femtosecond optical excitation of GaAsPhysical Review Letters, 1991
- Interferometric characterization of 160 fs far-infrared light pulsesApplied Physics Letters, 1991
- Power scaling of large-aperture photoconducting antennasApplied Physics Letters, 1991
- Cherenkov Radiation from Femtosecond Optical Pulses in Electro-Optic MediaPhysical Review Letters, 1984