Studies on coherent optical metadevices working at more than 100 GHz

2023 Fiscal Year Final Research Report

• Project/Area Number: 20K21134
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 28:Nano/micro science and related fields
• Research Institution: National Institute for Materials Science
• Principal Investigator: IWANAGA Masanobu 国立研究開発法人物質・材料研究機構, 電子・光機能材料研究センター, 主席研究員 (20361066)
• Project Period (FY): 2020-07-30 – 2024-03-31
• Keywords: メタ表面 / ナノ・マイクロフォトニック構造 / 原子層材料 / 発光増強 / ラマン散乱増強

Outline of Final Research Achievements

Aiming finally at ultrahigh repetition more than 100 GHz, we considered metadevices that work in purely optical manners. One of the metadevices has in-plane light-guide structures and the other has surface-emitting structures. As experimental studies, we conducted fundamental research on surface-emitting highly bright optical metadevices. Transferring two-dimensional atomic-layer luminescent materials onto optical metasurfaces, we prepared surface-emitting optical metadevices and examined the photoluminescent (PL) properties in the experiment. Consequently, we found prominent enhancing effects for the PL. The PL has an ultrafast component in the order of 1 picosecond, showing that 100 GHz operation is in principle possible.

Free Research Field

ナノフォトニクス

Academic Significance and Societal Importance of the Research Achievements

現在のCPU、約 3 GHz動作、を超える非常に大きな繰り返し動作、最終目標 100 GHz 超え、を可能にする新デバイス（メタデバイスと呼ぶ）を創出するための基礎研究を行った。実用化されていない新構造、すなわち、原子層膜材料と光機能性ナノ構造表面（メタ表面）の接合系、を実験的に研究することで原理的に 100 GHz 動作可能な応答を観測した。