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Phys Rev Lett. 2005 Sep 30;95(14):143904. Epub 2005 Sep 29.

Whispering gallery resonators for studying orbital angular momentum of a photon.

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1
Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109-8099, USA.

Abstract

We propose a simple method for generation and detection of photons with nonzero angular momentum. The method utilizes high-quality factor ring resonators that transform a plane electromagnetic wave into a wave with nonzero angular momentum, and vice versa. We show that the method is especially promising for studying high-order Bessel beams, unreachable by other techniques.

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