Despite its huge potential, such as in biomedical research for bioparticle sorting and sensing, near-field optical trapping suffers from limited trapping efficiency due to the weak evanescent field ...
The gradient-thickness-protected microbottle resonator traps 500-nanometer-radius polystyrene particles across an axial span exceeding 195 micrometers with a threshold power of just 0.198 milliwatts.
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