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Optically Tunable Fiber-Tip Nano-Optomechanical Resonator for Mass Sensing
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DOI：10.1109/jlt.2026.3701931.png)
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Abstract
En 中文
Nanomechanical resonators operating at high frequencies are well-suited for demanding applications, particularly in the realm of ultrasensitive mass and force detection. For these applications, a continuous tunable frequency with a linear wide, linear range is highly desired. However, conventional electrically tunable methods have limitations of complex design, nonlinearity, and pull-in instability. The present work demonstrated a fiber-tip nano-optomechanical resonator that can be tuned using an all-optical method. This all-optical tuning method is realized through changing the laser power, which is fast and convenient. The nano-optomechanical resonator fabricated at the fiber tip is further used for mass sensing. Its fabrication process includes transferring multilayer graphene to the end of a hollow-core optical fiber segment that is fusion-spliced to a single-mode fiber, and then processing the suspended graphene membrane using a focused ion beam (FIB) to create a trampoline-type structure. The proposed optically tuned fiber-tip mass sensor has an all-optical-fiber integrated structure and thus is compact. Small masses are detected by monitoring changes in the nanomechanical resonator’s resonance frequency. The mass detection of the nano-optomechanical resonator is demonstrated by depositing Au atoms on the surface of the trampoline-type multilayer graphene (MLG) film. This miniature, optically tunable, all-fiber mass sensor exhibited a resolution of 2.381 fg within its linear operating range at room temperature. The results show that the optically tunable trampoline-type MLG resonator has enormous potential in ultrasensitive detection for biosensing and gas sensing.
Keywords:
Frequency tuning
graphene
mass sensing
nano-optomechanical resonator
optical fiber sensor
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