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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Alan E. Willner
  • Vol. 38, Iss. 17 — Sep. 1, 2013
  • pp: 3410–3413

Experimental high numerical aperture focusing with high contrast gratings

Annett B. Klemm, Daan Stellinga, Emiliano R. Martins, Liam Lewis, Guillaume Huyet, Liam O’Faolain, and Thomas F. Krauss  »View Author Affiliations


Optics Letters, Vol. 38, Issue 17, pp. 3410-3413 (2013)
http://dx.doi.org/10.1364/OL.38.003410


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Abstract

We demonstrate high aperture (up to NA 0.64 ) three-dimensional focusing in free space based on wavefront-engineered diffraction gratings. The grating lens’ optical response is tailored by spatially varying the grating ridge and groove width in two dimensions to achieve focal lengths of order 100 μm that are crucial for micro-optical applications. The phase profile of the lens includes multiple 2 π phase jumps and was obtained by applying an algorithm for finding the optimal path for both phase and amplitude. Experimental measurements reveal a lateral spot size of 5 μm that is close to the size of a corresponding Airy disk.

© 2013 Optical Society of America

OCIS Codes
(050.1970) Diffraction and gratings : Diffractive optics
(230.3990) Optical devices : Micro-optical devices
(050.5298) Diffraction and gratings : Photonic crystals

ToC Category:
Diffraction and Gratings

History
Original Manuscript: July 2, 2013
Revised Manuscript: August 2, 2013
Manuscript Accepted: August 2, 2013
Published: August 28, 2013

Citation
Annett B. Klemm, Daan Stellinga, Emiliano R. Martins, Liam Lewis, Guillaume Huyet, Liam O’Faolain, and Thomas F. Krauss, "Experimental high numerical aperture focusing with high contrast gratings," Opt. Lett. 38, 3410-3413 (2013)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-38-17-3410

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