Design and Fabrication for the Construction of MIR HEB Mixers
Design and Fabrication for the Construction of MIR HEB Mixers
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DOI：
10.1109/tasc.2016.2631898
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发表时间：
2017-06
影响因子：
1.8
通讯作者：
A. Kawakami;H. Shimakage;J. Horikawa;M. Hyodo;S. Saito;Shukichi Tanaka;Y. Uzawa
中科院分区：
文献类型：
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作者：
A. Kawakami;H. Shimakage;J. Horikawa;M. Hyodo;S. Saito;Shukichi Tanaka;Y. Uzawa
为了设计中红外(MIR)热电子测辐射热计(HeBS)天线，利用傅里叶变换红外光谱测量了Au薄膜在低温下的表面阻抗。我们制作了由金薄膜条构成的谐振器阵列。谐振器的长度、宽度和厚度分别设置为1300 nm、200 nm和55 nm。随着温度的降低，谐振频率向低频侧移动。通过将谐振频率与模拟结果进行拟合，建立了用于设计MIR纳米天线的修正表面电抗。利用修正后的表面阻抗设计并制作了具有双缝天线的MIR HeBS。设计频率为61太赫兹。HeBS是由Au天线和电极组成的超导带状结构。这里，Au电极下的超导电性被一层Ni薄膜抑制。为了评价MIR HeBS的混频特性，搭建了无分束器的测量装置。在这个装置中，本机振荡器功率直接施加到HEB，我们证实了通过LO辐照可以将HEB的临界电流降低到几乎为零。此外，还观察到了具有明显偏振依赖性的HEB响应。
In order to design antennas for mid-infrared (MIR) hot electron bolometers (HEBs), the surface impedance of Au thin films at cryogenic temperatures was evaluated using Fourier transform infrared spectroscopy with a sample cooling system. We fabricated resonator arrays that were constructed by gold thin film strips. The length, width, and thickness of the resonators were set at 1300, 200, and 55 nm, respectively. As the temperature was lowered, the resonant frequency was shifted to the low-frequency side. By fitting the resonant frequency to simulated results, the corrected surface reactance was established for designing MIR nano-antennas. MIR HEBs with a twin-slot antenna were designed and fabricated using the corrected surface impedance. The design frequency was 61 THz. The HEBs were formed as a superconducting strip with Au antennas and electrodes. Here, the superconductivity under the Au electrodes was suppressed by a Ni thin film. For evaluating the mixer properties of the MIR HEBs, measurement setup without beam splitter was constructed. In this setup, local oscillator power was applied directly to the HEB, and we confirmed that the critical current of the HEB can be reduced to be almost zero by the LO irradiation. The HEB responses with clear polarization dependencies were also observed.