Emergent nonlinear optical effects in two-dimensional materials using ultrahigh-Q optical microcavities

2023 Fiscal Year Final Research Report

• Project/Area Number: 22K14625
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 30020:Optical engineering and photon science-related
• Research Institution: Keio University
• Principal Investigator: Fujii Shun 慶應義塾大学, 理工学部(矢上), 助教 (80897950)
• Project Period (FY): 2022-04-01 – 2024-03-31
• Keywords: 微小光共振器 / 二次元材料 / 非線形光学効果

Outline of Final Research Achievements

High-efficiency second-order nonlinear optical processes have been demonstrated by using a hybrid device, where an atomically-thin two-dimensional material is integrated into a high-Q silica optical microcavity. By performing the layer-dependence and excitation power dependence measurements, it is confirmed that the strong nonlinearity was enhanced by a microcavity via strong light-matter interaction at the surface. Although silica does not inherently show second-order nonlinearities, this approach provides a method to drastically alter the nonlinear properties of high-Q optical microcavities by functionalizing with semiconductor two-dimensional materials without significant losses.

Free Research Field

量子光エレクトロニクス

Academic Significance and Societal Importance of the Research Achievements

高Q値微小光共振器の非線形光学特性を，原子層二次元材料の転写というプロセスで自由に制御できる可能性を示した．特に，連続光レーザー励起で高効率な非線形光学効果の観測に成功したことは，微小光共振器と二次元材料の親和性の高さを証明する重要な結果である．また，本手法を適用することで将来的なナノフォトニクスデバイスの設計の自由度を飛躍的に高めることが期待される．