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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Vol. 30, Iss. 11 — Jun. 1, 2005
  • pp: 1291–1293

Superhigh numerical aperture (NA>1.5) micro gradient-index lens based on a dual-material approach

Yingyan Huang and Seng-Tiong Ho  »View Author Affiliations


Optics Letters, Vol. 30, Issue 11, pp. 1291-1293 (2005)
http://dx.doi.org/10.1364/OL.30.001291


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Abstract

We describe a novel scheme for obtaining a superhigh numerical aperture gradient-index (SHNA GRIN) lens from multiple thin layers of two or more materials with large refractive-index contrast. Design procedures for the lens are described, including variation of the layer thickness to achieve focusing and of the thickness limit to reduce scattering loss. We use an exact numerical solution by the finite-difference time-domain method to evaluate the lens's performance. Specific examples of a SHNA GRIN lens with a SiO2-TiO2 material system designed for fiber coupling to a nanowaveguide are shown to have focusing FWHM spot sizes of 0.53-0.7 µm at lambda=1.55 µm (corresponding to a NA of approximately 1.6-1.1) with 2.7-2.4% more loss than an ideal continuous index profile GRIN lens. With this approach, a SHNA GRIN lens with a NA of >1.5 and a length of <20 µm can be achieved with currently available thin-film deposition techniques.

© 2005 Optical Society of America

OCIS Codes
(080.3630) Geometric optics : Lenses
(110.2760) Imaging systems : Gradient-index lenses
(230.4170) Optical devices : Multilayers
(310.6860) Thin films : Thin films, optical properties

Citation
Yingyan Huang and Seng-Tiong Ho, "Superhigh numerical aperture (NA>1.5) micro gradient-index lens based on a dual-material approach," Opt. Lett. 30, 1291-1293 (2005)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-30-11-1291

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