Hirokazu Kobayashi, Koji Nonaka, Masao Kitano
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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http://arxiv.org/abs/1204.4950
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