On the origin of photogenerated terahertz radiation from current-biased superconducting YBa2Cu3O7-δ thin films

Po Lem Lin; Chih-Wei Luo; Hsin Shan Liu; Shyh Feng Chen; Kaung-Hsiung Wu; Jenh-Yih Juang; Tseng Ming Uen; Yih Shung Gou; Jiunn-Yuan Lin

doi:10.1063/1.1738537

On the origin of photogenerated terahertz radiation from current-biased superconducting YBa₂Cu₃O₇-δ thin films

Po Lem Lin^*, Chih-Wei Luo, Hsin Shan Liu, Shyh Feng Chen, Kaung-Hsiung Wu, Jenh-Yih Juang, Tseng Ming Uen, Yih Shung Gou, Jiunn-Yuan Lin

^*Corresponding author for this work

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

2 Scopus citations

Abstract

The origin of photogenerated terahertz radiation pulse emitted from current-biased superconducting YBa2Cu3O72d thin films excited by femtosecond optical laser pulses is delineated. By investigating the performance of the transient terahertz radiation generated under different operating parameters, pulse reshaping in the measured terahertz electric field caused by the kinetic inductance of the superconducting charge carriers is identified. After recovering the original wave forms of the emitted terahertz pulses, the transient supercurrent density directly correlated to the optically excited quasiparticle dynamics is obtained. A fast decreasing component of about 1.0 ps and a slower recovery process with a value of 2.5 ps are unambiguously delineated in the optically induced supercurrent modulation. The radiation mechanism of the transient terahertz pulse related to nonequilibrium superconductivity is discussed.

Original language	English
Pages (from-to)	8046-8050
Number of pages	5
Journal	Journal of Applied Physics
Volume	95
Issue number	12
DOIs	https://doi.org/10.1063/1.1738537
State	Published - 15 Jun 2004

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title = "On the origin of photogenerated terahertz radiation from current-biased superconducting YBa2Cu3O7-δ thin films",

abstract = "The origin of photogenerated terahertz radiation pulse emitted from current-biased superconducting YBa2Cu3O72d thin films excited by femtosecond optical laser pulses is delineated. By investigating the performance of the transient terahertz radiation generated under different operating parameters, pulse reshaping in the measured terahertz electric field caused by the kinetic inductance of the superconducting charge carriers is identified. After recovering the original wave forms of the emitted terahertz pulses, the transient supercurrent density directly correlated to the optically excited quasiparticle dynamics is obtained. A fast decreasing component of about 1.0 ps and a slower recovery process with a value of 2.5 ps are unambiguously delineated in the optically induced supercurrent modulation. The radiation mechanism of the transient terahertz pulse related to nonequilibrium superconductivity is discussed.",

author = "Lin, {Po Lem} and Chih-Wei Luo and Liu, {Hsin Shan} and Chen, {Shyh Feng} and Kaung-Hsiung Wu and Jenh-Yih Juang and Uen, {Tseng Ming} and Gou, {Yih Shung} and Jiunn-Yuan Lin",

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doi = "10.1063/1.1738537",

language = "English",

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journal = "Journal of Applied Physics",

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T1 - On the origin of photogenerated terahertz radiation from current-biased superconducting YBa2Cu3O7-δ thin films

AU - Lin, Po Lem

AU - Luo, Chih-Wei

AU - Liu, Hsin Shan

AU - Chen, Shyh Feng

AU - Wu, Kaung-Hsiung

AU - Juang, Jenh-Yih

AU - Uen, Tseng Ming

AU - Gou, Yih Shung

AU - Lin, Jiunn-Yuan

PY - 2004/6/15

Y1 - 2004/6/15

N2 - The origin of photogenerated terahertz radiation pulse emitted from current-biased superconducting YBa2Cu3O72d thin films excited by femtosecond optical laser pulses is delineated. By investigating the performance of the transient terahertz radiation generated under different operating parameters, pulse reshaping in the measured terahertz electric field caused by the kinetic inductance of the superconducting charge carriers is identified. After recovering the original wave forms of the emitted terahertz pulses, the transient supercurrent density directly correlated to the optically excited quasiparticle dynamics is obtained. A fast decreasing component of about 1.0 ps and a slower recovery process with a value of 2.5 ps are unambiguously delineated in the optically induced supercurrent modulation. The radiation mechanism of the transient terahertz pulse related to nonequilibrium superconductivity is discussed.

AB - The origin of photogenerated terahertz radiation pulse emitted from current-biased superconducting YBa2Cu3O72d thin films excited by femtosecond optical laser pulses is delineated. By investigating the performance of the transient terahertz radiation generated under different operating parameters, pulse reshaping in the measured terahertz electric field caused by the kinetic inductance of the superconducting charge carriers is identified. After recovering the original wave forms of the emitted terahertz pulses, the transient supercurrent density directly correlated to the optically excited quasiparticle dynamics is obtained. A fast decreasing component of about 1.0 ps and a slower recovery process with a value of 2.5 ps are unambiguously delineated in the optically induced supercurrent modulation. The radiation mechanism of the transient terahertz pulse related to nonequilibrium superconductivity is discussed.

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DO - 10.1063/1.1738537

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JO - Journal of Applied Physics

JF - Journal of Applied Physics

IS - 12

ER -

On the origin of photogenerated terahertz radiation from current-biased superconducting YBa₂Cu₃O₇-δ thin films

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