Tetrahertz Pulse Radiation Properties of a Bi2Sr2CaCu2O8+δ Bowtie Antenna by Optical Pulse Illumination
Tetrahertz Pulse Radiation Properties of a Bi2Sr2CaCu2O8+δ Bowtie Antenna by Optical Pulse Illumination
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光脉冲照明下 Bi2Sr2CaCu2O8+δ 蝴蝶结天线的太赫兹脉冲辐射特性
DOI：
10.1143/jjap.41.1992
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发表时间：
2002
影响因子：
1.5
通讯作者：
Zhen Wang
中科院分区：
文献类型：
--
作者：
H. Murakami;T. Kiwa;M. Misra;M. Tonouchi;T. Uchiyama;I. Iguchi;Zhen Wang
利用飞秒激光脉冲照射，首次研究了电流偏置Bi 2Sr 2CaCu 2 O 8 +δ（BSCCO）蝶形天线的太赫兹（THz）脉冲辐射特性.偏置电流、激发激光功率和太赫兹脉冲辐射幅度的温度依赖性与YBa_2Cu_3O_（7-δ）（YBCO）的实验结果基本一致。然而，从BSCCO的THz脉冲的详细属性是相当大的不同，从YBCO。由于BSCCO薄膜折射率值小，即使在小的偏置电流下，观测到的太赫兹（THz）辐射脉冲幅度也很大，脉冲的傅里叶分量包含低于0.4 THz的频率，中心频率在0.1-0.16 THz，反映了BSCCO中光激发准粒子的长弛豫时间。
We demonstrate, for the first time, terahertz (THz) pulse radiation properties from a current biased Bi2Sr2CaCu2O8+δ (BSCCO) bowtie antenna by femtosecond laser pulse illumination. The bias current, excitation laser power and temperature dependence of the radiated amplitude of THz pulse are basically in good agreement with those observed on YBa2Cu3O7-δ (YBCO). However, the detailed properties of the THz pulse from BSCCO are considerably different from those for YBCO. The observed amplitude of the terahertz (THz) radiation pulse was very strong due to the small index value of BSCCO thin film even for the small bias current, and the Fourier components of the pulse contains the frequencies lower than 0.4 THz with a central frequency around 0.1–0.16 THz reflecting its long relaxation time of photo-excited quasi-particle in BSCCO.