Gradient-thickness-protected WGM microbottle resonator for large-scale particle trapping. (IMAGE)
Caption
Gradient-thickness-protected WGM microbottle resonator for large-scale particle trapping. a Schematic of particle trapping in the microbottle WGM resonator. b Microscope image of the microbottle, overlaid with simulated optical hotspots near the inner wall. c Zoomed-in rz-view of the optical hotspots at equatorial center, showing the action of the optical gradient force. d xy-view showing the action of the optical scattering force
Credit
Microsystems & Nanoengineering
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