Park Tae Gwan, Kim Chaeyoon, Oh Eon-Taek, Na Hong Ryeol, Chun Seung-Hyun, Lee Sunghun, Rotermund Fabian
Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea.
Department of Physics and Astronomy, Sejong University, Seoul 02504, Republic of Korea.
Nanophotonics. 2024 Feb 2;13(7):1059-1068. doi: 10.1515/nanoph-2023-0769. eCollection 2024 Mar.
The acousto-optic modulation over a broad near-infrared (NIR) spectrum with high speed, excellent integrability, and relatively simple scheme is crucial for the application of next-generation opto-electronic and photonic devices. This study aims to experimentally demonstrate ultrafast acousto-optic phenomena in the broad NIR spectral range of 0.77-1.1 eV (1130-1610 nm). Hundreds of GHz of light modulation are revealed in an all-optical configuration by combining ultrafast optical spectroscopy and light-sound conversion in 10-20 nm-thick bismuth selenide (BiSe) van der Waals thin films. The modified optical transition energy and the line shape in the NIR band indicate phonon-photon interactions, resulting in a modulation of optical characteristics by the photoexcited interlayer vibrations in BiSe. This all-optical, ultrafast acousto-optic modulation approach may open avenues for next-generation nanophotonic applications, including optical communications and processing, due to the synergistic combination of large-area capability, high photo-responsivity, and frequency tunability in the NIR spectral range.
在宽近红外（NIR）光谱范围内实现具有高速、出色可集成性和相对简单方案的声光调制，对于下一代光电器件和光子器件的应用至关重要。本研究旨在通过实验证明在0.77 - 1.1 eV（1130 - 1610 nm）的宽近红外光谱范围内的超快声光现象。通过将超快光学光谱学与10 - 20 nm厚的硒化铋（BiSe）范德华薄膜中的光声转换相结合，在全光配置中揭示了数百GHz的光调制。近红外波段中修改后的光学跃迁能量和线形表明了声子 - 光子相互作用，这是由BiSe中光激发的层间振动导致光学特性的调制。由于在近红外光谱范围内具有大面积能力、高光响应性和频率可调性的协同组合，这种全光、超快声光调制方法可能为包括光通信和处理在内的下一代纳米光子应用开辟道路。
