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2023 年度 実績報告書

Ultra-compact Sub-mm Heterodyne Focal Plane Array Frontends for Radio Astronomical Observation

研究課題

研究課題/領域番号 21H01134
配分区分補助金
研究機関国立天文台

研究代表者

SHAN Wenlei  国立天文台, 先端技術センター, 准教授 (60792570)

研究分担者 江崎 翔平  国立天文台, 先端技術センター, 研究技師 (40794508)
田村 友範  国立天文台, 先端技術センター, 技師 (90897828)
研究期間 (年度) 2021-04-01 – 2026-03-31
キーワードFocal Plane Array / Heterodyne / SIS Mixer / Radio Astronomy
研究実績の概要

In FY 2023, we concentrated on investigating losses in superconducting thin-film transmission lines, which serve as the backbone of MMIC SIS mixers currently under development. This study addresses the fundamental differences between MMIC SIS mixers and traditional SIS mixers based on quartz substrates.

In silicon-based MMIC SIS mixers, longer superconducting transmission lines (around five wavelengths) are necessary to accommodate more complex circuits, including orthomode transducers and sideband separation circuits. This introduces transmission loss as a significant factor, potentially degrading the sensitivity of SIS mixers.Despite the importance of transmission loss in superconducting transmission lines operating at millimeter and sub-millimeter wavelengths, experimental studies are limited due to technical challenges. To address this gap, we developed two methods for assessing the superconducting thin-film transmission lines:On-Chip Detectors: This method integrates detectors directly onto the chip, enabling in-situ measurements;Network Analyzer: This approach utilizes a network analyzer to measure the transmission loss across the superconducting lines.Both methods have yielded significant results, contributing valuable insights into the superconducting transmission lines' performance. These findings are essential to achieving the project's research goals and advancing the development of MMIC SIS mixers.

現在までの達成度 (区分)
現在までの達成度 (区分)

2: おおむね順調に進展している

理由

The research plan for the fiscal year 2023 focused on advancing MMIC technology through four key tasks:
(1)Transmission Loss Investigation: It was fully fulfilled with significant progress made in transmission measurement methods for superconducting microstrips and coplanar waveguides at 2 mm wavelengths and liquid helium temperatures. The following major results were obtained: The measured transmission loss cannot be attributed solely to conduction loss produced by normal electrons;The dielectric loss in amorphous materials is significantly higher than in bulk materials, likely due to two-level system loss;Radiation loss can become significant when the size of the coplanar waveguide exceeds a small fraction of the wavelength;Magnetic fields applied perpendicularly to superconducting thin films can lead to notable loss, explained by vortex flow.
(2)MMIC Fabrication Process: We conducted a series of tests to optimize the photolithography system, enhancing control over line widths to dimensions around 1 micrometer.(3)Crosstalk Mitigation: We redesigned the mixer holder to minimize the stimulation of undesired modes causing crosstalk. An existing mixer holder has been modified and is awaiting experimental confirmation.(4)Sideband Separation Demonstration: This task intended to complete the demonstration of the sideband separation configuration with silicon-based MMICs at ALMA Band 4. However, due to a focus on Task 1, this work was suspended and will be reassigned in FY 2024.

今後の研究の推進方策

The following studies will be performed in the 2024 fiscal year:(1) Conclude the results obtained in the investigation of the transmission loss of planar superconducting transmission lines by publishing research papers. Reconsider the design and fabrication process of MMIC SIS mixer based on these results and try to improve the sensitivity. (2) Continue studies on the fabrication process of MMICs to improve the fabrication yield and the quality of SIS junctions in terms of the nonlinearity of the IV characteristics. (3) Finish the experimental verification of the alternative method to TSVs to solve the crosstalk problem. (4) Finally, complete the demonstration of sideband separation configuration with silicon-based MMICs at ALMA Band 4.

  • 研究成果

    (8件)

すべて 2024 2023

すべて 雑誌論文 (1件) (うち査読あり 1件) 学会発表 (7件) (うち国際学会 5件)

  • [雑誌論文] Silicon Membrane-Based Waveguide-to-Superconducting CPW Transitions at 2 mm Band2023

    • 著者名/発表者名
      Masukura Akihiro、Shan Wenlei、Ezaki Shohei、Kojima Takafumi、Nakajima Taku、Mizuno Akira
    • 雑誌名

      IEEE Transactions on Applied Superconductivity

      巻: 33 ページ: 1~5

    • DOI

      10.1109/TASC.2023.3267331

    • 査読あり
  • [学会発表] A New-generation Multi-beam Superconducting Receiver Supporting Polarization Observation2024

    • 著者名/発表者名
      Wenlei Shan, Shohei Ezaki
    • 学会等名
      Magnetic Fields from Clouds to Stars (Bfields-2024)
    • 国際学会
  • [学会発表] Measured Transmission Losses of Superconducting CPW and MS at 2mm Wavelength2024

    • 著者名/発表者名
      Wenlei Shan, Shohei Ezaki
    • 学会等名
      日本天文学会春季年会
  • [学会発表] Inconstant Output Noise of SIS Mixers and Implication in Input Noise Measurement2023

    • 著者名/発表者名
      Wenlei Shan
    • 学会等名
      16th European Conference on Applied Superconductivity (EUCAS 2023)
    • 国際学会
  • [学会発表] Broad-band silicon membrane-based waveguide-to-superconducting CPW transition and applications in SIS receivers2023

    • 著者名/発表者名
      Wenlei Shan, Shohei Ezaki
    • 学会等名
      15th International Workshop on High Temperature Superconductors in High Frequency Fields (HTSHFF 2023)
    • 国際学会
  • [学会発表] A New-generation Multi-beam Superconducting Receiver for Astronomical Observation2023

    • 著者名/発表者名
      Wenlei Shan, Shohei Ezaki, Takafumi Kojima, and Yoshinori Uzawa
    • 学会等名
      18th International Superconductive Electronics Conference (ISEC 2023)
    • 国際学会
  • [学会発表] On-chip Crosstalk in MMIC SIS Mixers and Possible Solutions2023

    • 著者名/発表者名
      Wenlei Shan, Shohei Ezaki
    • 学会等名
      24th East Asia Submillimeter-wave Receiver Technology Workshop
    • 国際学会
  • [学会発表] Development of Compact Superconducting Heterodyne Multibeam Receivers2023

    • 著者名/発表者名
      Wenlei Shan, Shohei Ezaki, Keiko Kaneko, Akihira Miyachi, Haoran Kang, Alvaro Gonzalez, Takafumi Kojima, Yoshinori Uzawa, Takashi Noguchi, Akihiro Masukura, Taku Nakajima, and Akira Mizuno
    • 学会等名
      「第24回ミリ波サブミリ波受信機ワークショップ」と「2023年度理研-NICT合同テラヘルツワークショップ」

URL: 

公開日: 2024-12-25  

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