期刊
ACS PHOTONICS
卷 2, 期 10, 页码 1410-1415出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.5b00353
关键词
photonic crystal; optical tweezers; near-field optical forces; photonic force microscopy; optical lattice; near-field optical microscopy
类别
资金
- Labex ACTION Program [ANR-11-LABX-0001-01]
By analyzing the thermal motion of fluorescent dielectric microbeads trapped in the near-field of a silicon nanocavity, we investigate the influence of the bead's size and the trapping laser power on the shape of the optical trap and the effective trap stiffness. We demonstrate that the trapping potential is proportional to the subwavelength patterns of the electromagnetic near-field intensity distribution for unexpectedly large Mie particle sizes. More especially, we show that mapping the trapping potential experienced by a 500 nm diameter bead reveals the nanopattems of the cavity resonant mode. This result highlights how photonic force microscopy in nanotweezers can provide an elegant way to image evanescent fields at the nanoscale via the thermal motion of optically trapped fluorescent microprobes.
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