Effects of two-photon absorption on Terahertz radiation generated by femtosecond-laser excited photoconductive antennas

Chao Kuei Lee; Chan Shan Yang; Sung Hui Lin; Shiuan Hua Huang; Osamu Wada; Ci Ling Pan

doi:10.1364/OE.19.023689

Effects of two-photon absorption on Terahertz radiation generated by femtosecond-laser excited photoconductive antennas

Chao Kuei Lee^*, Chan Shan Yang, Sung Hui Lin, Shiuan Hua Huang, Osamu Wada, Ci Ling Pan

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

Abstract

Terahertz (THz) radiation can be generated more efficiently from a low-temperature-grown GaAs (LT-GaAs) photoconductive (PC) antenna by considering the two-photon absorption (TPA) induced photo-carrier in the photoconductor. A rate-equation-based approach using the Drude-Lorentz model taking into account the band-diagram of LT-GaAs is used for the theoretical analysis. The use of transform-limited pulses at the PC antenna is critical experimentally. Previously unnoticed THz pulse features and anomalously increasing THz radiation power rather than saturation were observed. These are in good agreement with the theoretical predictions. The interplay of intensity dependence and dynamics of generation of photoexcited carriers by single-photon absorption and TPA for THz emission is discussed.

Original language	English
Pages (from-to)	23689-23697
Number of pages	9
Journal	Optics Express
Volume	19
Issue number	24
DOIs	https://doi.org/10.1364/OE.19.023689
Publication status	Published - 2011 Nov 21
Externally published	Yes

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics

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title = "Effects of two-photon absorption on Terahertz radiation generated by femtosecond-laser excited photoconductive antennas",

abstract = "Terahertz (THz) radiation can be generated more efficiently from a low-temperature-grown GaAs (LT-GaAs) photoconductive (PC) antenna by considering the two-photon absorption (TPA) induced photo-carrier in the photoconductor. A rate-equation-based approach using the Drude-Lorentz model taking into account the band-diagram of LT-GaAs is used for the theoretical analysis. The use of transform-limited pulses at the PC antenna is critical experimentally. Previously unnoticed THz pulse features and anomalously increasing THz radiation power rather than saturation were observed. These are in good agreement with the theoretical predictions. The interplay of intensity dependence and dynamics of generation of photoexcited carriers by single-photon absorption and TPA for THz emission is discussed.",

author = "Lee, {Chao Kuei} and Yang, {Chan Shan} and Lin, {Sung Hui} and Huang, {Shiuan Hua} and Osamu Wada and Pan, {Ci Ling}",

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AU - Lee, Chao Kuei

AU - Yang, Chan Shan

AU - Lin, Sung Hui

AU - Huang, Shiuan Hua

AU - Wada, Osamu

AU - Pan, Ci Ling

PY - 2011/11/21

Y1 - 2011/11/21

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AB - Terahertz (THz) radiation can be generated more efficiently from a low-temperature-grown GaAs (LT-GaAs) photoconductive (PC) antenna by considering the two-photon absorption (TPA) induced photo-carrier in the photoconductor. A rate-equation-based approach using the Drude-Lorentz model taking into account the band-diagram of LT-GaAs is used for the theoretical analysis. The use of transform-limited pulses at the PC antenna is critical experimentally. Previously unnoticed THz pulse features and anomalously increasing THz radiation power rather than saturation were observed. These are in good agreement with the theoretical predictions. The interplay of intensity dependence and dynamics of generation of photoexcited carriers by single-photon absorption and TPA for THz emission is discussed.

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Effects of two-photon absorption on Terahertz radiation generated by femtosecond-laser excited photoconductive antennas

Abstract

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