电介质微球的光谱分辨共振推进
Spectrally resolved resonant propulsion of dielectric microspheres
摘要：
使用共振光力开辟了一种独特的方法，以大批量排序的微球谐振器具有更高的均匀性的谐振相比，在耦合腔结构获得的最好的半导体技术。在这项工作中，直接观察到的光谱响应的推进力施加在聚苯乙烯微球附近的锥形微纤维。测量是基于可调谐激光器和内部谐振之间的失谐的控制，在每个球的精度高于谐振的宽度。测量的推进力的光谱形状与微球中的回音壁模式共振有很好的相关性。证明了沿锥形推进的微球存在一个稳定的径向陷阱。在20 μm的微球中观察到的巨大的力峰与模型计算结果吻合得很好，表明了光动量的有效利用。
英文摘要：
Use of resonant light forces opens up a unique approach to high-volume sorting of microspherical resonators with much higher uniformity of resonances compared to that in coupled-cavity structures obtained by the best semiconductor technologies. In this work, the spectral response of the propulsion forces exerted on polystyrene microspheres near tapered microfibers is directly observed. The measurements are based on the control of the detuning between the tunable laser and internal resonances in each sphere with accuracy higher than the width of the resonances. The measured spectral shape of the propulsion forces correlates well with the whispering-gallery mode resonances in the microspheres. The existence of a stable radial trap for the microspheres propelled along the taper is demonstrated. The giant force peaks observed for 20-μm spheres are found to be in a good agreement with a model calculation demonstrating an efficient use of the light momentum for propelling the microspheres.
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