Near-field optical trapping with an actively locked cavity

作者：van Leeuwen N J^*; Moore L J; Partridge W D; Peverall R; Ritchie G A D; Summers M D

来源：Journal of Optics, 2011, 13(4): 044007.

DOI：10.1088/2040-8978/13/4/044007

• optical trapping
• evanescent
• near-field
• cavity enhancement
• interference
• beam shaping
• colloids

This paper details the construction and performance of a resonant cavity evanescent wave trap for the trapping and assembling of microparticles. The technique employs a low finesse resonator which incorporates total internal reflection (TIR) at the silica/water interface to generate an evanescent field which is coherently scattered by silica microparticles present in suspension to form optically bound structures. Circulating powers of 14 W over an area of 150 mu m x 75 mu m were generated with a 400 mW Nd:YAG source. This approach allows some degree of control over the shape of the evanescent field by locking to higher-order cavity modes.

• 出版日期2011-4