[show abstract][hide abstract] ABSTRACT: A simple method to trap and manipulate metallic micro/nano-particles on the surface of photorefractive crystals is proposed. After inducing inhomogeneous charge density and space-charge fields in photorefractive crystals by non-uniform illumination, both uncharged and charged metallic particles can be trapped on the illuminated surface due to dielectrophoretic force and electrophoretic force, respectively. A transition from dielectrophoresis to electrophoresis is observed when manipulating nano-silver particles with high surface space-charge field. Our results show that this method is simple and effective to form surface microstructures of metallic particles.
[show abstract][hide abstract] ABSTRACT: We constructed a four-layer system composed of a prism, a silver film, an air layer and a lithium niobate crystal. Initially we used two coherent light beams to excite surface plasmons. The surface plasmons were then decoupled into light in the photorefractive crystal where a holographic grating was recorded. The two beams remained coherent through light to surface plasmons to light transformation. Studying the characteristics of the holographic grating we found out that the thickness of the grating was to the order of hundreds of microns. The thick holographic grating suggests that the holographic recording in the photorefractive materials was induced by the leaky waves rather than by surface plasmon polaritons directly.
Science China: Physics, Mechanics and Astronomy · 1.17 Impact Factor