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 journalArticlepeer-review

10 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 languageEnglish
Pages (from-to)23689-23697
Number of pages9
JournalOptics Express
Volume19
Issue number24
DOIs
Publication statusPublished - 2011 Nov 21
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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