Bouchard, Frédéric and Mand, Harjaspreet and Mirhosseini, Mohammad and Karimi, Ebrahim and Boyd, Robert W. (2014) Achromatic orbital angular momentum generator. New Journal of Physics, 16 (12). Art. No. 123006. ISSN 1367-2630. doi:10.1088/1367-2630/16/12/123006. https://resolver.caltech.edu/CaltechAUTHORS:20190628-110704360
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Abstract
We describe a novel approach for generating light beams that carry orbital angular momentum (OAM) by means of total internal reflection in an isotropic medium. A continuous space-varying cylindrically symmetric reflector, in the form of two glued hollow axicons, is used to introduce a nonuniform rotation of polarization into a linearly polarized input beam. This device acts as a full spin-to-orbital angular momentum convertor. It functions by switching the helicity of the incoming beamʼs polarization, and by conservation of total angular momentum thereby generates a well-defined value of OAM. Our device is broadband, since the phase shift due to total internal reflection is nearly independent of wavelength. We verify the broad-band behaviour by measuring the conversion efficiency of the device for three different wavelengths corresponding to the RGB colours, red, green and blue. An average conversion efficiency of 95% for these three different wavelengths is observed. This device may find applications in imaging from micro- to astronomical systems where a white vortex beam is needed.
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| Additional Information: | © 2014 IOP Publishing Ltd and Deutsche Physikalische Gesellschaft. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Received 7 September 2014. Accepted 24 October 2014. Published 2 December 2014. The authors thank Joe Vornehm, Mark Martucci and Doug Hand for insightful discussions regarding the cone fabrication. The authors also acknowledge the support of the Canada Excellence Research Chairs (CERC) program. | |||||||||
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| Subject Keywords: | light orbital angular momentum, spin angular momentum, total internal reflection | |||||||||
| Issue or Number: | 12 | |||||||||
| DOI: | 10.1088/1367-2630/16/12/123006 | |||||||||
| Record Number: | CaltechAUTHORS:20190628-110704360 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20190628-110704360 | |||||||||
| Official Citation: | Frédéric Bouchard et al 2014 New J. Phys. 16 123006 | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 96835 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | George Porter | |||||||||
| Deposited On: | 01 Jul 2019 14:53 | |||||||||
| Last Modified: | 16 Nov 2021 17:24 |
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