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Near Field Observation of a Refractive Index Grating and a Topographical Grating by an Optically-Trapped Gold Particle |
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| Authors: | |
| Institution: | (1) Faculty of Science and Engineering, Ritsumeikan University, 1-1-1, Nojihigashi, Kusatsu-shi Shiga, 525, Japan;(2) Currently with Matsushita Denko Corporation, Kadoma, Osaka 571, Japan |
| Abstract: | We observed the near field for a refractive index grating fabricated on a planar light waveguide circuit (PLC) by scanning an optically-trapped 100 nm diameter gold particle. We demonstrate that stable trapping and scanning occur with a Gaussian laser beam at the scan velocity of 1.6  m/s and Nd:YAG laser power of 25mW. The scattered Ar laser light from the gold particle is strong at high refractive indexes of the grating with periods of 1.06 m and 0.53 m both by s and p polarized illumination. In addition, we observed the surface profile of the optical disk tracking groove with and without the gold particle. © 2004 The Optical Society of Japan |
| Keywords: | near field optical tweezers refractive index grating planar light waveguide circuit PLC gold particle optical trapping polarization groove |
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