講演情報
[17p-WL2_201-13]Large-Area Enhancement of Photoluminescence and Second-Harmonic Generation in Monolayer WSe2 via Freestanding Photonic Membrane
Fong-Liang Hsieh1,5, 〇CHIHZONG DENG1, Shao-Ku Huang5, Tsung-Hsin Liu5, Mu-Hsin Chen1, Chun-Hao Chiang1,5, Che-Lun Lee5, Man-Hong Lai4, Jui-Han Fu2, Vincent Tung2, Yu-Ming Chang4,3, Chun-Wei Chen5,4,3, Ya-Lun Ho1 (1.NIMS, 2.Department of Chemical System Engineering, The Univ. of Tokyo, 3.Center of Atomic Initiative for New Materials, National Taiwan Univ., 4.Center for Condensed Matter Sciences, National Taiwan Univ., 5.Department of Materials Science and Engineering, National Taiwan Univ.)
キーワード：
Photonic membrane、Bound states in the continuum、2D material
Two-dimensional transition metal dichalcogenides such as WSe2 possess extraordinary excitonic and nonlinear optical properties, yet their sub-nanometer thickness often limits the light-matter interaction strength required for practical optoelectronic and quantum applications. In this work, we report a large-area freestanding photonic membrane designed to significantly amplify the optical response of monolayer WSe2 through the excitation of high-Q optical resonance.
The architecture comprises a freestanding SiN membrane patterned with a triangular lattice of air holes onto which the monolayer WSe2 is transferred. We observe a peak PL enhancement factor of 1158 at the high-Q optical resonance, indicating successful coupling between the monolayer excitons and the high-Q modes. Similarly, the second-harmonic generation (SHG) response is significantly intensified. the SHG signal from the WSe2 on the photonic membrane is 378 times stronger than the reference, a result of the intense local field enhancement provided by the high-Q optical resonance. The PL intensity map showing uniform emission over the entire 450 × 450 µm2 membrane, confirming that the enhancement is a collective property of the photonic membraneThese results validate the proposed freestanding photonic membrane as a highly uniform and efficient platform for large-scale, 2D-material-based nonlinear and quantum photonic devices.
The architecture comprises a freestanding SiN membrane patterned with a triangular lattice of air holes onto which the monolayer WSe2 is transferred. We observe a peak PL enhancement factor of 1158 at the high-Q optical resonance, indicating successful coupling between the monolayer excitons and the high-Q modes. Similarly, the second-harmonic generation (SHG) response is significantly intensified. the SHG signal from the WSe2 on the photonic membrane is 378 times stronger than the reference, a result of the intense local field enhancement provided by the high-Q optical resonance. The PL intensity map showing uniform emission over the entire 450 × 450 µm2 membrane, confirming that the enhancement is a collective property of the photonic membraneThese results validate the proposed freestanding photonic membrane as a highly uniform and efficient platform for large-scale, 2D-material-based nonlinear and quantum photonic devices.