Design and Fabrication for the Construction of MIR HEB Mixers
| Autor: | Shukichi Tanaka, Hisashi Shimakage, Shingo Saito, Akira Kawakami, Yoshinori Uzawa, Junsei Horikawa, Masaharu Hyodo |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
business.industry Terahertz radiation Local oscillator Bolometer 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials law.invention Resonator Optics law 0103 physical sciences Electrical and Electronic Engineering Thin film Antenna (radio) 010306 general physics 0210 nano-technology business Electrical impedance Beam splitter |
| Zdroj: | IEEE Transactions on Applied Superconductivity. 27:1-5 |
| ISSN: | 1558-2515 1051-8223 |
| DOI: | 10.1109/tasc.2016.2631898 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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