Terahertz emission from YBa2Cu3O7-δ Josephson junctions excited by femtosecond laser

Takahiro Yoshimura; Toshihiko Kiwa; Masayoshi Tonouchi

doi:10.1016/S0921-4534(01)00698-0

Terahertz emission from YBa₂Cu₃O_7-δ Josephson junctions excited by femtosecond laser

Takahiro Yoshimura, Toshihiko Kiwa, Masayoshi Tonouchi

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

3 Citations (Scopus)

Abstract

We examine both power and bias current dependence of terahertz (THz) emission properties from YBa₂Cu₃O_7-δ (YBCO) Josephson junctions. The junctions coupled to bow-tie antennas are fabricated by Ar ion milling from YBCO thin films grown on MgO bicrystals. We observe the radiation at bias currents from 0 to 50 mA, laser powers from 0 to 250 mW. The radiation amplitude increases with increasing laser power, and the frequency at which the radiation has a maximum amplitude decreases with increasing laser power. These trends are observed regardless of junction voltage. The results suggest that the voltage of the Josephson junction plays a less important role in the THz radiation excited by a femtosecond laser.

Original language	English
Pages (from-to)	329-332
Number of pages	4
Journal	Physica C: Superconductivity and its applications
Volume	362
Issue number	1-4
DOIs	https://doi.org/10.1016/S0921-4534(01)00698-0
Publication status	Published - Sep 1 2001
Externally published	Yes

Keywords

Femtosecond laser pulse
Josephson junction
Terahertz radiation
YBaCuO

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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10.1016/S0921-4534(01)00698-0

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abstract = "We examine both power and bias current dependence of terahertz (THz) emission properties from YBa2Cu3O7-δ (YBCO) Josephson junctions. The junctions coupled to bow-tie antennas are fabricated by Ar ion milling from YBCO thin films grown on MgO bicrystals. We observe the radiation at bias currents from 0 to 50 mA, laser powers from 0 to 250 mW. The radiation amplitude increases with increasing laser power, and the frequency at which the radiation has a maximum amplitude decreases with increasing laser power. These trends are observed regardless of junction voltage. The results suggest that the voltage of the Josephson junction plays a less important role in the THz radiation excited by a femtosecond laser.",

keywords = "Femtosecond laser pulse, Josephson junction, Terahertz radiation, YBaCuO",

author = "Takahiro Yoshimura and Toshihiko Kiwa and Masayoshi Tonouchi",

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AU - Yoshimura, Takahiro

AU - Kiwa, Toshihiko

AU - Tonouchi, Masayoshi

PY - 2001/9/1

Y1 - 2001/9/1

N2 - We examine both power and bias current dependence of terahertz (THz) emission properties from YBa2Cu3O7-δ (YBCO) Josephson junctions. The junctions coupled to bow-tie antennas are fabricated by Ar ion milling from YBCO thin films grown on MgO bicrystals. We observe the radiation at bias currents from 0 to 50 mA, laser powers from 0 to 250 mW. The radiation amplitude increases with increasing laser power, and the frequency at which the radiation has a maximum amplitude decreases with increasing laser power. These trends are observed regardless of junction voltage. The results suggest that the voltage of the Josephson junction plays a less important role in the THz radiation excited by a femtosecond laser.

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KW - Femtosecond laser pulse

KW - Josephson junction

KW - Terahertz radiation

KW - YBaCuO

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