realization of true perfect absorption

• Project/Area Number: 20H02545
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 28010:Nanometer-scale chemistry-related
• Research Institution: Yokohama National University
• Principal Investigator: Yoshiaki Nishijima 横浜国立大学, 大学院工学研究院, 准教授 (60581452)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Project Status: Completed (Fiscal Year 2022)
• Budget Amount: ¥17,940,000 (Direct Cost: ¥13,800,000、Indirect Cost: ¥4,140,000); Fiscal Year 2022: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000); Fiscal Year 2021: ¥6,890,000 (Direct Cost: ¥5,300,000、Indirect Cost: ¥1,590,000); Fiscal Year 2020: ¥8,450,000 (Direct Cost: ¥6,500,000、Indirect Cost: ¥1,950,000)
• Keywords: メタ表面 / 放射制御 / 完全吸収 / プラズモニクス / 光熱変換 / 中赤外 / 無反射材料

Outline of Research at the Start

これまでのすべての研究では、無反射＝完全吸収と解釈され、散乱は起こらないというのが定説であった。最近研究代表者は、この過程に無視できない散乱が存在することを、シミュレーションにより見出した。本研究では、プラズモン光吸収体からの散乱を実験的に精密に計測するシステムを構築し、実効的な光吸収を定量的に評価するとともに、真の完全吸収構造の実現と、それによる極限効率の光熱変換デバイスの構築を目指す。

Outline of Final Research Achievements

We succeeded in establishing a method to quantitatively evaluate the scattering cross section and the absorption cross section by the electromagnetic field simulation by the FDTD method. We also succeeded in actually measuring the scattering spectrum from the measurement using the integrating sphere. We have also found that true perfect absorption can be achieved experimentally by introducing an absorption loss into a metal or dielectric layer.

Academic Significance and Societal Importance of the Research Achievements

実吸収に利用されていない光量を正確に見積もり、真の完全吸収構造を提案・実現させる道筋を明らかにすることは、光熱変換デバイスの更なる高効率化を実現する上で非常に重要であり、学術的にも大いに意義のある研究課題である。

Research Products

• [Int'l Joint Research] Swinburne University of technology(オーストラリア)
• [Int'l Joint Research] Swinburne University of technology(オーストラリア)
• [Journal Article] The Tunable Coupling between Metasurface and Molecular Vibration towards the Platform of Spectral Analysis (2022)
  • Author(s): Nishijima Yoshiaki、Juodkazis Saulius
  • Journal Title: Bulletin of the Chemical Society of Japan Volume: 95 Issue: 9 Pages: 1318-1324
  • DOI: 10.1246/bcsj.20220173
• [Journal Article] Control of Vibration-Metasurface Coupling at the Mid-Infrared Spectral Window for Inorganic Thermal Emitters (2022)
  • Author(s): Nishijima Yoshiaki、Juodkazis Saulius
  • Journal Title: Bulletin of the Chemical Society of Japan Volume: 95 Issue: 9 Pages: 1411-1418
  • DOI: 10.1246/bcsj.20220163
• [Journal Article] Absorption and scattering in perfect thermal radiation absorber-emitter metasurfaces (2022)
  • Author(s): Nishijima Yoshiaki、To Naoki、Bal?ytis Armandas、Juodkazis Saulius
  • Journal Title: Optics Express Volume: 30 Issue: 3 Pages: 4058-4058
  • DOI: 10.1364/oe.447885
• [Journal Article] Coupling of molecular vibration and metasurface modes for efficient mid-infrared emission (2022)
  • Author(s): Nishijima Yoshiaki、Morimoto Shinya、Bal?ytis Armandas、Hashizume Tomoki、Matsubara Ryosuke、Kubono Atsushi、To Naoki、Ryu Meguya、Morikawa Junko、Juodkazis Saulius
  • Journal Title: Journal of Materials Chemistry C Volume: 10 Issue: 2 Pages: 451-462
  • DOI: 10.1039/d1tc04519a
  • Peer Reviewed
• [Journal Article] Kirchhoff’s Thermal Radiation from Lithography-Free Black Metals (2020)
  • Author(s): Kumagai Takuhiro、To Naoki、Bal?ytis Armandas、Seniutinas Gediminas、Juodkazis Saulius、Nishijima Yoshiaki
  • Journal Title: Micromachines Volume: 11 Issue: 9 Pages: 824-824
  • DOI: 10.3390/mi11090824
• [Journal Article] Black silicon as a highly efficient photo-thermal converter for snow/ice melting in early spring agriculture (2020)
  • Author(s): Nishijima Yoshiaki、Nishijima Hiroyoshi、Juodkazis Saulius
  • Journal Title: Solar Energy Materials and Solar Cells Volume: 217 Pages: 110706-110706
  • DOI: 10.1016/j.solmat.2020.110706
• [Remarks] 【プレスリリース】超狭帯域赤外放射を実現
  • URL: https://www.ynu.ac.jp/hus/koho/27484/detail.html