Issue |
J. Eur. Opt. Soc.-Rapid Publ.
Volume 8, 2013
|
|
---|---|---|
Article Number | 13017 | |
Number of page(s) | 8 | |
DOI | https://doi.org/10.2971/jeos.2013.13017 | |
Published online | 03 March 2013 |
Regular papers
Rotating vortex imaging implemented by a quantized spiral phase modulation
Department of Optics, Palacký University, 17. listopadu 1192/12, 771 46 Olomouc, Czech Republic
Received:
15
January
2013
Revised:
8
February
2013
We demonstrate both theoretically and experimentally that a spiral mask with a finite number of discrete phase levels allows a defocusing induced rotation of the point spread function in the vortex imaging. Two experimental configurations based on a spiral phase modulation of light and a spiral filtering of the spatial spectrum are studied in a unified theoretical treatment. The rotating point spread functions are analyzed in detail for imaging realized by the vortex lens and the 4-f system used in the spiral phase contrast microscopy. The theoretical results are verified by experiments using a spatial light modulator. The method is applicable to a precise focusing and optical imaging allowing depth estimation from diffracted rotation. Apart from implementation simplicity, the main advantages of the method are high energy efficiency, a possibility to operate with either complex amplitude or spatial spectrum of light and variability allowing a simple control of number of lobes of the point spread function.
Key words: Singular optics / optical vortices / phase modulation / liquid-crystal devices
© The Author(s) 2013. All rights reserved.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.