Journal
OPTICS COMMUNICATIONS
Volume 173, Issue 1-6, Pages 269-274Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0030-4018(99)00619-7
Keywords
orbital angular momentum of light
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Within a ray-optical approximation we show that there is a limit to the orbitaI angular momentum per unit energy that can be focussed onto a small particle. This limit depends solely on the geometry of the focussing optics and the size of the particle and is independent of the wavelength of the light. (C) 2000 Elsevier Science B.V. All rights reserved.
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