Ultrafast Electron Dynamics in GaAs and InP Studied by Time-Resolved Terahertz Emission Spectroscopy


Toshiaki HATTORI , Satoshi ARAI and Keiji TUKAMOTO
Institute of Applied Physics, University of Tsukuba, Tsukuba 305-8573, Japan
(Received June 14, 2004; accepted August 6, 2004; published November 10, 2004)
We studied the ultrafast dynamics of electrons generated by tunable femtosecond optical pulses having positive and negative
excess energies in GaAs and InP by observing the temporal waveform of THz radiation emitted from biased photoconductive
antennas. Sub-picosecond intraband relaxation was observed when the excess energy was positive. When excited by optical
pulses having negative excess energies, it was observed that the THz waveform had a picosecond decay, which was attributed
to the transition from the Urbach state to the free carrier state of electrons on the picosecond time scale. This dynamical
behavior was found to be very sensitive to the applied electric field in the range of several kV/cm. The largest THz signal was
obtained by pumping the emitter at the band-gap energy.

 

Product Data Sheets

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Pulse strecher/compressor
Avoca SPIDER system
Buccaneer femtosecond fiber lasers with SHG Second Harmonic Generator
Cannon Ultra-Broadband Light Source
Cortes Cr:Forsterite Regenerative Amplifier
Infrared cross-correlator CCIR-800
Cross-correlator Rincon
Femtosecond Autocorrelator IRA-3-10
Kirra Faraday Optical Isolators
Mavericks femtosecond Cr:Forsterite laser
OAFP optical attenuator
Pearls femtosecond fiber laser (Er-doped fiber, 1530-1565 nm)
Pismo pulse picker
Reef-M femtosecond scanning autocorrelator for microscopy
Reef-RTD scanning autocorrelator
Reef-SS single shot autocorrelator
Femtosecond Second Harmonic Generator
Spectrometer ASP-100M
Spectrometer ASP-150C
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Tamarack and Buccaneer femtosecond fiber lasers (Er-doped fiber, 1560+/- 10nm)
Teahupoo femtosecond Ti:Sapphire regenerative amplifier
Femtosecond third harmonic generator
Tourmaline femtosecond fiber laser (1054 nm)
Tourmaline TETA Yb femtosecond amplified laser system
Tourmaline Yb-SS femtosecond solid state laser system
Trestles CW Ti:Sapphire laser
Trestles femtosecond Ti:Sapphire laser
Trestles Finesse femtosecond lasers system integrated with DPSS pump laser
Wedge Ti:Sapphire multipass amplifier

THz crystals
ZnTe
 
 

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 CR-ZnTe-10-0.5   ZnTe crystal, 10x10x0.5 mm, 110-cut  Buy Now 
 CR-ZnTe-10-10-1   ZnTe crystal, 10x10x1 mm, 110-cut  Buy Now 
 CR-ZnTe-20-20-0.2   ZnTe crystal, 20x20x0.2 mm, 110-cut  Buy Now 
 CR-ZnTe-6-6-0.2   ZnTe crystal, 6x6x0.2 mm, 110-cut  Buy Now 
 

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GaP
 
 

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 CR-GaP-10-10-0.5   GaP crystal, 100-cut, 10x10x0.5 mm  Buy Now 
 CR-GaP-10-10-0.1   GaP crystal, 110-cut, 10x10x0.1 mm  Buy Now 
 CR-GaP-10-10-0.2   GaP crystal, 110-cut, 10x10x0.2 mm  Buy Now 
 CR-GaP-10-10-0.3   GaP crystal, 110-cut, 10x10x0.3 mm  Buy Now 
 CR-GaP-10-10-0.5   GaP crystal, 110-cut, 10x10x0.5 mm  Buy Now 
 CR-GaP-10-10-1   GaP crystal, 110-cut, 10x10x1 mm  Buy Now 
 CR-GaP-10-10-4   GaP crystal, 110-cut, 10x10x4 mm  Buy Now 
 CR-GaP-10-10-5   GaP crystal, 110-cut, 10x10x5 mm  Buy Now 
 CR-GaP-10-8-0.15   GaP crystal, 110-cut, 10x8x0.15 mm  Buy Now 
 CR-GaP-19-19-0.2   GaP crystal, 110-cut, 19x19x0.2 mm  Buy Now 
 CR-GaP-19-21-0.3   GaP crystal, 110-cut, 19x21x0.3 mm  Buy Now 
 CR-GaP-5-5-0.1   GaP crystal, 110-cut, 5x5x0.1 mm  Buy Now 
 CR-GaP-5-5-0.25   GaP crystal, 110-cut, 5x5x0.25 mm  Buy Now 
 CR-GaP-5-5-0.85   GaP crystal, 110-cut, 5x5x0.85 mm  Buy Now 
 CR-GaP-8-8-0.2   GaP crystal, 110-cut, 8x8x0.2 mm  Buy Now 
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Photoconductive antenna (PCA)
James Heyman - Ultrafast THz - Electron dynamics - Photonics training - Ultrafast THz lab - Modern Physics - Carrier transport -
THz Photo-Hall - THz GaAs - THz emission - Time-domain QW
Intersubband scattering - Terahertz Imaging - Terahertz Time-Domain Spectroscopy

other references for review:

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