Helical mode conversion using conical reflector

Details Helical mode conversion using conical reflector Helical mode conversion using conical reflector

2012-04-23

arxiv.org/abs/1204.4950v1

Physics

Optics

7 pages, 7 figures

Scientific paper

In this study, we present a theoretical analysis on the manipulation of the helical wavefront of optical beams using a conical-shape reflector and demonstrate the generation of helical beams from an ordinary Gaussian beam. This technique utilizes the spatially-dependent geometric phase, or more specifically, the spin redirection phase, which is fundamentally different from the usual phase factor induced by optical path length differences. The spin redirection phase does not depend upon the wavelength. Thus, the conical reflector has a great advantage in terms of being able to manipulate the helical wavefront with broadband light such as white light or short light pulses.

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