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Proceedings Paper

Focusing capability of integrated chains of microspheres in the limit of geometrical optics
Author(s): Arash Darafsheh; Kenneth W. Allen; Amir Fardad; Nathaniel M. Fried; Andrew N. Antoszyk; Howard S. Ying; Vasily N. Astratov
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Paper Abstract

The effects of periodical focusing of light were studied in chains of sapphire microspheres with 300 μm diameters assembled either on a substrate or inside capillary tubing. Dye-doped fluorescent microspheres were used as multimodal sources of light in experimental studies. Significant reduction of the focused spot sizes was observed for chains of spheres compared to a single sphere case. Numerical ray tracing simulations were performed for similar chains assembled inside hollow waveguides to be used as an optical delivery system with mid-infrared lasers for ultra-precise surgery. The device designs were optimized for contact conditions during laser surgery involving short optical penetration depths of light in tissue. It is shown that chains of spheres with n around 1.65-1.75 provide a two-fold improvement of the spatial resolution over single spheres. Potential applications of these microprobes include ultraprecise laser procedures in the eye and brain or piercing a cell, and coupling of multimodal beams into photonic microstructures.

Paper Details

Date Published: 19 February 2011
PDF: 7 pages
Proc. SPIE 7913, Laser Resonators and Beam Control XIII, 79131A (19 February 2011); doi: 10.1117/12.876139
Show Author Affiliations
Arash Darafsheh, The Univ. of North Carolina at Charlotte (United States)
Kenneth W. Allen, The Univ. of North Carolina at Charlotte (United States)
Amir Fardad, PhotonTech LLC (United States)
Nathaniel M. Fried, The Univ. of North Carolina at Charlotte (United States)
Andrew N. Antoszyk, Charlotte Eye Ear Nose and Throat Associates (United States)
Howard S. Ying, Johns Hopkins Univ. (United States)
Vasily N. Astratov, The Univ. of North Carolina at Charlotte (United States)


Published in SPIE Proceedings Vol. 7913:
Laser Resonators and Beam Control XIII
Alexis V. Kudryashov; Alan H. Paxton; Vladimir S. Ilchenko, Editor(s)

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