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Proceedings Paper

Intense electric pulses with 187-fs FWHM generated by near-filled-gap nonuniform illumination excitation
Author(s): Sheng-fu Horng; Shi-Hsiang Lu; Jun-Liang Li; Jian-Shen Yu; Tsong-Ru Tsai; Cheng-Chung Chi
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Paper Abstract

We reported the observation of intense ultrashort electric pulses generated by a novel nearly-filled-gap nonuniform illumination (NFGNI) excitation scheme. This NFGNI scheme differs from conventional nonuniform illumination in that the excitation beam is focused to a spotsize only slightly smaller than the spacing between the transmission lines, and is located symmetrically within the gap. With NFGNI of 100 fs laser pulses on sliding-contact photoconductive switches fabricated on low-temperature-grown-GaAs, electric pulse correlation with 187 fs FWHM, which corresponds to a 3 dB bandwidth of 1.1 THz, was observed. To our knowledge, these are the shortest electric pulses ever reported in the literature. Moreover, these electric pulses were found three times stronger than these generated with filled-gap illumination. Bias, wavelength, and pump power dependencies are discussed.

Paper Details

Date Published: 12 November 1999
PDF: 8 pages
Proc. SPIE 3795, Terahertz and Gigahertz Photonics, (12 November 1999); doi: 10.1117/12.370199
Show Author Affiliations
Sheng-fu Horng, National Tsing Hua Univ. (Taiwan)
Shi-Hsiang Lu, National Tsing Hua Univ. (Taiwan)
Jun-Liang Li, National Tsing Hua Univ. (Japan)
Jian-Shen Yu, National Tsing Hua Univ. (Taiwan)
Tsong-Ru Tsai, National Tsing Hua Univ. (Taiwan)
Cheng-Chung Chi, National Tsing Hua Univ. (Taiwan)

Published in SPIE Proceedings Vol. 3795:
Terahertz and Gigahertz Photonics
R. Jennifer Hwu; Ke Wu, Editor(s)

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