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在WSe₂中的增强光子-光子相互作用声学纳米腔

Alex D Carr¹, Claudia Ruppert², Anton K Samusev²

¹School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, United Kingdom.

ACS photonics

|March 25, 2024

概括

使用WSe2层的声学纳米腔 (ANC) 显示了对高频声信号 (高达1 THz) 的增强光子 - 声子相互作用. 这些发现突出了ANCs.

科学领域:

固态物理固态物理
材料科学材料科学材料科学
纳米技术纳米技术

背景情况:

在1GHz以上运行的声学纳米腔 (ANC) 对先进的传感器和量子设备至关重要.
范德瓦尔斯 (vdW) 纳米层使ANC具有高达1 THz的共振频率和10^3.3的质量因子.
光学方法对于在这些高频率产生和检测连贯声子至关重要,因为电气方法是不够的.

研究的目的:

在实验和理论上研究由WSe2层制造的声学纳米腔.
在ANC中研究来自呼吸模式的光学测量声信号的振幅.
探索ANC与激子共振的潜力,以在高温下进行高频声子操作.

主要方法:

在体晶体上使用WSe2层 (8-130 nm厚) 制造ANC.
使用单个波长在刺激子共振附近的光学探测声学信号.
测量由连贯声子诱导的相对反射率变化,在100GHz左右的频率上达到3×10^-4.

主要成果:

在广泛的声频范围内证明了光子-声子相互作用的增强.
观测到声信号幅度对在刺激子共振附近的光弹性常数的高灵敏度.
在厚度接近布拉格条件的纳米层中发现光弹性共振.

结论:

基于WSe2的ANC显示出对声光学设备的巨大潜力.
这项研究揭示了这些纳米结构中光子 - 声子相互作用的关键机制.
具有激子共振的ANC能够在高温下使用高频单声子工作.

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