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Probing optical mode hybridization in an integrated graphene nano-optomechanical system
Journal of the Optical Society of America B ( IF 1.9 ) Pub Date : 2020-03-18 , DOI: 10.1364/josab.389944
Aneesh Dash , S. K. Selvaraja , A. K. Naik

We propose a scheme for sensitive local monitoring of mode hybridization in vertically asymmetric waveguides with a nano-optomechanical probe based on graphene. Extracting local information about mode hybridization is challenging using intensity measurements at the output or scanning optical probes over the waveguide. Transferring the information about the guided field profiles into the mechanical mode of graphene (with ultra-low-force sensitivity) using the optical gradient force allows for sensitive probing of the mode hybridization. In our proposed scheme, we estimate that a 100% change in the TE fraction of the fundamental quasi-TM waveguide mode would cause a change in the vibration amplitude of graphene on the order of 1000 pm. The limit of detection of the TE fraction is approximately 0.001. The change in the TE fraction due to index perturbations in the core and cladding can also be used for index sensing with responsivity on the order of 1000 pm change in vibration amplitude per refractive index unit and a limit of detection of $ 2 \times {10^{ - 4}} $ refractive index units. This work provides novel methods for applications in optomechanical modulation and sensing.

中文翻译:

在集成石墨烯纳米光机械系统中探测光模杂交

我们提出了一个方案,用于基于石墨烯的纳米光机械探针对垂直非对称波导中的模式混合进行灵敏的局部监测。使用输出的强度测量或在波导上扫描光学探针来提取有关模式杂交的局部信息具有挑战性。使用光学梯度力将有关引导场轮廓的信息转换为石墨烯的机械模式(具有超低力灵敏度),从而可以对模式杂交进行灵敏探测。在我们提出的方案中,我们估计基本准TM波导模式的TE分数100%的变化将导致石墨烯的振动幅度变化,幅度约为1000 pm。TE分数的检测下限约为0.001。$ 2 \ times {10 ^ {-4}} $折射率单位。这项工作为光机械调制和传感中的应用提供了新颖的方法。
更新日期:2020-03-18
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