Detection of up to 20 THz with a low-temperature-grown GaAs photoconductive antenna gated with 15 fs light pulses

Kono, S.; Tani, Masahiko; Gu, Ping; Sakai, Kiyomi

doi:10.1063/1.1333403

Cited by 135 publications

(65 citation statements)

References 9 publications

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“…In a few cases, however, ultrabroad bandwidths (>10 THz) have been reported. Kono et al 17 reported a THz detection up to 20 THz with a low-temperature-grown GaAs (LT-GaAs) PDA gated with 15 fs light pulse. It was quite a surprising result as the LT-GaAs they used exhibited a relatively long carrier lifetime of ∼1.4 ps.…”

Section: Broadband Thz Generationmentioning

confidence: 99%

“…It was quite a surprising result as the LT-GaAs they used exhibited a relatively long carrier lifetime of ∼1.4 ps. According to the authors, the fast response of the PDA was explained by the fast rise in the photocurrent upon excitation by the ultrashort laser pulse, 17 and the physical origin of the fast photocurrent within ∼100 fs might be explained by the ballistic transport of the photoexcited electrons in the biased electric field. 18 In this picture, the PDA works as an integration detector, so the photocurrent from the antenna should be proportional to the time integration of the incident THz radiation.…”

Section: Broadband Thz Generationmentioning

confidence: 99%

See 1 more Smart Citation

Organic Broadband TeraHertz Sources and Sensors

Zheng¹,

McLaughlin²,

Cunningham³

et al. 2007

Journal of Nanoelectronics and Optoelectronics

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We review recent research using organic materials for generation and detection of broadband terahertz radiation (0.3 THz−30 THz). The main focus is on amorphous electrooptic (EO) polymers, with semiconducting polymers, molecular salt EO crystals, and molecular solutions briefly discussed. The advantages of amorphous EO polymers over other materials for broadband THz generation (via optical rectification) and detection (via EO sampling) include a lack of phonon absorption (good transparency) in the THz regime, high EO coefficient and good phase-matching properties, and, of course, easy fabrication (low cost). Our ∼12-THz, spectral gap-free THz system based on a polymer emitter-sensor pair is an excellent demonstration of the advantages using of EO polymers. We also present a model that can predict the performance of a polymer-based THz system. Both the dielectric properties of an EO polymer and laser pulse related parameters are included in the model, making the simulations close to real conditions. From our modeling work, the roles the dielectric properties play in the THz generation and detection are clearly seen, providing us with a good guide to select and design suitable EO polymers in the future.

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Section: Broadband Thz Generationmentioning

confidence: 99%

Section: Broadband Thz Generationmentioning

confidence: 99%

Organic Broadband TeraHertz Sources and Sensors

Zheng¹,

McLaughlin²,

Cunningham³

et al. 2007

Journal of Nanoelectronics and Optoelectronics

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show abstract

“…Phase data can in principle reveal details of the starting mechanism of the hybrid oscillations, but they are technically difficult to obtain due to dispersion and absorption effects in the semiconductor (Leitenstorfer et al,. 1999, Kono et al, 2000. Ignoring this phase information, Hasselbeck et al (Hasselbeck et al, 2002) used a broadband interferometric method with two 30 fs pump pulses directed at nearby regions in InAs to extract transient THz radiation signals interfering in the far field.…”

Section: Femtosecond-scale Optics 154mentioning

confidence: 99%

Time-Resolved Laser Spectroscopy of Semiconductors - Physical Processes and Methods of Analysis

Brudevoll¹,

Storebø²,

Skaaring³

et al. 2011

Femtosecond-Scale Optics

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“…All parabolic mirrors used had diameter of 5 cm. The receiver was again fabricated on "low temperature grown" GaAs, 8 this time using bow tie electrodes with length of 100 m and width of 27 m. The current induced by the terahertz radiation was initially preamplified before detection using lock-in techniques, referenced to a 1 kHz mechanical chopper placed in the pump arm, so that the electric field of the terahertz pulse could be measured. Terahertz pulses with signal to noise ratio of approximately 1200:1 were routinely obtained using this system, which could be enclosed in a dry box to allow measurements to be made in a purged nitrogen atmosphere if required.…”

Section: B Reflection By Slabsmentioning

confidence: 99%

Pulsed Terahertz Signal Reconstruction

Fletcher

Swift

Dai

et al. 2007

Journal of Applied Physics

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A procedure is outlined which can be used to determine the response of an experimental sample to a single, simple broadband frequency pulse in terahertz frequency time domain spectroscopy (TDS). The advantage that accrues from this approach is that oscillations and spurious signals (arising from a variety of sources in the TDS system or from ambient water vapor) can be suppressed. In consequence, small signals (arising from the interaction of the radiation with the sample) can be more readily observed in the presence of noise. Procedures for choosing key parameters and methods for eliminating further artifacts are described. In particular, the use of input functions which are based on the binomial distribution is described. These binomial functions are used to unscramble the sample response to a simple pulse: they have sufficient flexibility to allow for variations in the spectra of different terahertz sources, some of which have low frequency as well as high frequency cutoffs. The signal processing procedure is validated by simple reflection and transmission experiments using a gap between polytetrafluoroethylene (PTFE) plates to mimic a void within a larger material. It is shown that a resolution of 100μm is easily achievable in reflection geometry after signal processing.

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Detection of up to 20 THz with a low-temperature-grown GaAs photoconductive antenna gated with 15 fs light pulses

Abstract: We report on the ultrabroadband coherent detection of radiation in wavelengths spanning from far to midinfrared with a low-temperature-grown GaAs photoconductive dipole antenna gated with 15 fs light pulses. The detected spectral frequency exceeds 20 THz.

Cited by 135 publications

References 9 publications

Organic Broadband TeraHertz Sources and Sensors

Organic Broadband TeraHertz Sources and Sensors

Time-Resolved Laser Spectroscopy of Semiconductors - Physical Processes and Methods of Analysis

Pulsed Terahertz Signal Reconstruction

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