Depolarization of evanescent waves scattered by laser-trapped gold particles: Effect of particle size
- 1 November 2000
- journal article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 88 (9) , 5415-5420
- https://doi.org/10.1063/1.1316052
Abstract
Depolarization of evanescent waves scattered by laser-trapped gold particles of 0.1, 0.5 and 2 µm in diameter is experimentally characterized in order to reveal its dependence on the size of particles. It is found that the degree of polarization of scattered evanescent waves decreases with the size of gold particles, which is contrary to that previously observed for dielectric particles. This feature becomes advantageous in particle-trapped near-field microscopy since less depolarized photons carry more information of a sample. With the help of polarization gating, this property is demonstrated in images of the evanescent wave interference pattern as well as the surface of a glass prismThis publication has 13 references indexed in Scilit:
- Dependence of strength and depolarization of scattered evanescent waves on the size of laser-trapped dielectric particlesOptics Communications, 1999
- Effect of depolarization of scattered evanescent waves on particle-trapped near-field scanning optical microscopyApplied Physics Letters, 1999
- Resonant absorption and scattering in evanescent fieldsApplied Physics B Laser and Optics, 1999
- Optimising the image contrast of conventional and confocal optical microscopes imaging finite sized spherical gold scatterersOptics Communications, 1998
- Near-field optical imaging using metal tips illuminated by higher-order Hermite–Gaussian beamsUltramicroscopy, 1998
- Near-Field Scanning Optical Microscope with a Laser Trapped ProbeJapanese Journal of Applied Physics, 1994
- Two-color trapped-particle optical microscopyOptics Letters, 1994
- Near-field scanning optical microscope with a metallic probe tipOptics Letters, 1994
- Scattering of an evanescent surface wave by a microscopic dielectric sphereApplied Optics, 1993
- Local fields at the surface of noble-metal microspheresPhysical Review B, 1981