Free-space electrooptic sampling of terahertz radiation from optically excited superconducting YBa2Cu3O7-δ thin films

Po Iem Lin; Kaung-Hsiung Wu; Jenh-Yih Juang; Jiunn-Yuan Lin; T. M. Uen; Y. S. Gou

doi:10.1109/TASC.2003.811033

Free-space electrooptic sampling of terahertz radiation from optically excited superconducting YBa₂Cu₃O_7-δ thin films

Po Iem Lin^*, Kaung-Hsiung Wu, Jenh-Yih Juang, Jiunn-Yuan Lin, T. M. Uen, Y. S. Gou

^*Corresponding author for this work

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

2 Scopus citations

Abstract

The characteristics of photogenerated terahertz radiation from a current-biased superconducting YBa₂Cu₃O_7-δ (YBCO) bow-tie antenna were investigated using a free-space electrooptic sampling technique. Picosecond electromagnetic pulses about 450 fs wide were obtained. The frequency spectrum derived by Fourier transforming the picosecond pulses spans over 0.1-4 THz. The dynamics of the quasi-particles optically induced by the ultrafast laser pulse primarily determines the performances of the transient terahertz radiation generated under different operating parameters. The results indicate a characteristic quasi-particle relaxation time of about 2.5 ps close to the critical temperature T_c, and a faster time at lower temperatures.

Original language	English
Article number	1198077
Pages (from-to)	20-24
Number of pages	5
Journal	IEEE Transactions on Applied Superconductivity
Volume	13
Issue number	1
DOIs	https://doi.org/10.1109/TASC.2003.811033
State	Published - 1 Mar 2003

Keywords

Femtosecond laser illumination
Free-space electrooptic sampling (FSEOS)
Nonequilibrium superconductivity
Terahertz radiation
YBaCuO (YBCO)

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10.1109/TASC.2003.811033

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title = "Free-space electrooptic sampling of terahertz radiation from optically excited superconducting YBa2Cu3O7-δ thin films",

abstract = "The characteristics of photogenerated terahertz radiation from a current-biased superconducting YBa2Cu3O7-δ (YBCO) bow-tie antenna were investigated using a free-space electrooptic sampling technique. Picosecond electromagnetic pulses about 450 fs wide were obtained. The frequency spectrum derived by Fourier transforming the picosecond pulses spans over 0.1-4 THz. The dynamics of the quasi-particles optically induced by the ultrafast laser pulse primarily determines the performances of the transient terahertz radiation generated under different operating parameters. The results indicate a characteristic quasi-particle relaxation time of about 2.5 ps close to the critical temperature Tc, and a faster time at lower temperatures.",

keywords = "Femtosecond laser illumination, Free-space electrooptic sampling (FSEOS), Nonequilibrium superconductivity, Terahertz radiation, YBaCuO (YBCO)",

author = "Lin, {Po Iem} and Kaung-Hsiung Wu and Jenh-Yih Juang and Jiunn-Yuan Lin and Uen, {T. M.} and Gou, {Y. S.}",

year = "2003",

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doi = "10.1109/TASC.2003.811033",

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T1 - Free-space electrooptic sampling of terahertz radiation from optically excited superconducting YBa2Cu3O7-δ thin films

AU - Lin, Po Iem

AU - Wu, Kaung-Hsiung

AU - Juang, Jenh-Yih

AU - Lin, Jiunn-Yuan

AU - Uen, T. M.

AU - Gou, Y. S.

PY - 2003/3/1

Y1 - 2003/3/1

N2 - The characteristics of photogenerated terahertz radiation from a current-biased superconducting YBa2Cu3O7-δ (YBCO) bow-tie antenna were investigated using a free-space electrooptic sampling technique. Picosecond electromagnetic pulses about 450 fs wide were obtained. The frequency spectrum derived by Fourier transforming the picosecond pulses spans over 0.1-4 THz. The dynamics of the quasi-particles optically induced by the ultrafast laser pulse primarily determines the performances of the transient terahertz radiation generated under different operating parameters. The results indicate a characteristic quasi-particle relaxation time of about 2.5 ps close to the critical temperature Tc, and a faster time at lower temperatures.

AB - The characteristics of photogenerated terahertz radiation from a current-biased superconducting YBa2Cu3O7-δ (YBCO) bow-tie antenna were investigated using a free-space electrooptic sampling technique. Picosecond electromagnetic pulses about 450 fs wide were obtained. The frequency spectrum derived by Fourier transforming the picosecond pulses spans over 0.1-4 THz. The dynamics of the quasi-particles optically induced by the ultrafast laser pulse primarily determines the performances of the transient terahertz radiation generated under different operating parameters. The results indicate a characteristic quasi-particle relaxation time of about 2.5 ps close to the critical temperature Tc, and a faster time at lower temperatures.

KW - Femtosecond laser illumination

KW - Free-space electrooptic sampling (FSEOS)

KW - Nonequilibrium superconductivity

KW - Terahertz radiation

KW - YBaCuO (YBCO)

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Free-space electrooptic sampling of terahertz radiation from optically excited superconducting YBa₂Cu₃O_7-δ thin films

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Keywords

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