Ultrafast Optical Response and Terahertz Radiation from High-<I>T<SUB>c</SUB></I> Superconductor

Masanori HANGYO; Noboru WADA; Masayoshi TONOUCHI; Masahiko TANI; Kiyomi SAKAI

Ultrafast Optical Response and Terahertz Radiation from High-T_c Superconductor

Masanori HANGYO, Noboru WADA, Masayoshi TONOUCHI, Masahiko TANI, Kiyomi SAKAI

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New THz radiation devices made of high-T_c superconductors are fabricated and their characteristics are studied in detail. Ultrashort electromagnetic pulses with 0.5 ps width have been radiated into free space from current biased devices made of superconducting YBa₂Cu₃O₇ (YBCO) films by exciting with femtosecond laser pulses. The Fourier spectrum of them extends up to 3 THz. The radiation mechanism is ascribed to the ultrafast supercurrent modulation by the optical pulses. The THz waveform is analyzed using rate equations describing the relaxation of photoexcited quasiparticles. By the improvement of the device structure and the collecting optics, the radiation power can be increased up to 0.5 µW. A new type THz radiation from YBCO films under an external magnetic field without a transport current is also reported.

Publication: IEICE TRANSACTIONS on Electronics Vol.E80-C No.10 pp.1282-1290

Publication Date: 1997/10/25

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Type of Manuscript: Special Section INVITED PAPER (Special Issue on Basic Properties and Applications of Superconductive Electron Devices)

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Masanori HANGYO, Noboru WADA, Masayoshi TONOUCHI, Masahiko TANI, Kiyomi SAKAI, "Ultrafast Optical Response and Terahertz Radiation from High-Tc Superconductor" in IEICE TRANSACTIONS on Electronics, vol. E80-C, no. 10, pp. 1282-1290, October 1997, doi: .
Abstract: New THz radiation devices made of high-T_c superconductors are fabricated and their characteristics are studied in detail. Ultrashort electromagnetic pulses with 0.5 ps width have been radiated into free space from current biased devices made of superconducting YBa₂Cu₃O₇ (YBCO) films by exciting with femtosecond laser pulses. The Fourier spectrum of them extends up to 3 THz. The radiation mechanism is ascribed to the ultrafast supercurrent modulation by the optical pulses. The THz waveform is analyzed using rate equations describing the relaxation of photoexcited quasiparticles. By the improvement of the device structure and the collecting optics, the radiation power can be increased up to 0.5 µW. A new type THz radiation from YBCO films under an external magnetic field without a transport current is also reported.
URL: https://globals.ieice.org/en_transactions/electronics/10.1587/e80-c_10_1282/_p

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@ARTICLE{e80-c_10_1282,
author={Masanori HANGYO, Noboru WADA, Masayoshi TONOUCHI, Masahiko TANI, Kiyomi SAKAI, },
journal={IEICE TRANSACTIONS on Electronics},
title={Ultrafast Optical Response and Terahertz Radiation from High-Tc Superconductor},
year={1997},
volume={E80-C},
number={10},
pages={1282-1290},
abstract={New THz radiation devices made of high-T_c superconductors are fabricated and their characteristics are studied in detail. Ultrashort electromagnetic pulses with 0.5 ps width have been radiated into free space from current biased devices made of superconducting YBa₂Cu₃O₇ (YBCO) films by exciting with femtosecond laser pulses. The Fourier spectrum of them extends up to 3 THz. The radiation mechanism is ascribed to the ultrafast supercurrent modulation by the optical pulses. The THz waveform is analyzed using rate equations describing the relaxation of photoexcited quasiparticles. By the improvement of the device structure and the collecting optics, the radiation power can be increased up to 0.5 µW. A new type THz radiation from YBCO films under an external magnetic field without a transport current is also reported.},
keywords={},
doi={},
ISSN={},
month={October},}

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TY - JOUR
TI - Ultrafast Optical Response and Terahertz Radiation from High-Tc Superconductor
T2 - IEICE TRANSACTIONS on Electronics
SP - 1282
EP - 1290
AU - Masanori HANGYO
AU - Noboru WADA
AU - Masayoshi TONOUCHI
AU - Masahiko TANI
AU - Kiyomi SAKAI
PY - 1997
DO -
JO - IEICE TRANSACTIONS on Electronics
SN -
VL - E80-C
IS - 10
JA - IEICE TRANSACTIONS on Electronics
Y1 - October 1997
AB - New THz radiation devices made of high-T_c superconductors are fabricated and their characteristics are studied in detail. Ultrashort electromagnetic pulses with 0.5 ps width have been radiated into free space from current biased devices made of superconducting YBa₂Cu₃O₇ (YBCO) films by exciting with femtosecond laser pulses. The Fourier spectrum of them extends up to 3 THz. The radiation mechanism is ascribed to the ultrafast supercurrent modulation by the optical pulses. The THz waveform is analyzed using rate equations describing the relaxation of photoexcited quasiparticles. By the improvement of the device structure and the collecting optics, the radiation power can be increased up to 0.5 µW. A new type THz radiation from YBCO films under an external magnetic field without a transport current is also reported.
ER -