Translation of colloidal particles next to a flat plate using evanescent waves

Extended-area optically induced organization of microparticles on a surface

“…As with previous TIR guiding, 5 particle speed was observed to increase linearly with laser power. With a 600 mW beam, these particles had an average speed of 1 m / s. Variations in velocity for a given power from sample to sample and setup to setup 2 may have to do both with particlesubstrate interactions and with minor variations in the precise angle of incidence.…”

“…TIR guiding of microparticles has also been performed above lithographically defined waveguides. 3,4 There are a variety of predictions regarding near-field and evanescent optical forces, 5,6 which are expected to depend sensitively upon the details of Mie scattering near an interface ͑Fig. 1͒.…”

Near-Field Optical Micromanipulation

“…The optical field under these trapping conditions has been simulated using vector diffraction theory [24]. As is evident, the axial component of the field is substantially reduced, and, consequently, the axial size of the trapping volume (which the authors defined by the position where the intensity drops to 50% of that at the interface) is reduced to approximately 60 nm [6]-approximately one order of magnitude shorter than that in the far field case. As is evident, the axial component of the field is substantially reduced, and, consequently, the axial size of the trapping volume (which the authors defined by the position where the intensity drops to 50% of that at the interface) is reduced to approximately 60 nm [6]-approximately one order of magnitude shorter than that in the far field case.…”

Precise determination of object position in 1D optical lattice

“…14,27 Recently analyses of the particle motion near an interface attracted a great attention especially in connection with the evanescent wave illumination. A new microscopic method have been developed -total internal reflection microscopy 28,29 -that employs the exponential decay of the illuminating field with the increasing distance from the surface. Therefore the intensity decay of the detected scattered field or fluorescence signal is used to obtain the distance of the object from the surface.…”