Wavelength-scalable micro-fabricated wedge for generation of optical vortex beam in optical manipulation

摘要

An optical wedge phase plate is fabricated for the study of vortex beam generation in optical manipulation. It is demonstrated that the wedge phase element provides scalability for generating the vortex beam at different wavelengths as long as the incident beam size is adjusted accordingly. The presence of singularity for different wavelengths and the associated orbital angular momentum are confirmed experimentally in optical manipulation.