Focusing capability of integrated chains of microspheres in the limit of geometrical optics

Arash Darafsheh; Kenneth W. Allen; Amir Fardad; Nathaniel M. Fried; Andrew N. Antoszyk; Howard S. Ying; Vasily N. Astratov

doi:10.1117/12.876139

18 February 2011 Focusing capability of integrated chains of microspheres in the limit of geometrical optics

Arash Darafsheh, Kenneth W. Allen, Amir Fardad, Nathaniel M. Fried, Andrew N. Antoszyk, Howard S. Ying, Vasily N. Astratov

Author Affiliations +

Proceedings Volume 7913, Laser Resonators and Beam Control XIII; 79131A (2011) https://doi.org/10.1117/12.876139
Event: SPIE LASE, 2011, San Francisco, California, United States

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.

Citation Download Citation

Arash Darafsheh, Kenneth W. Allen, Amir Fardad, Nathaniel M. Fried, Andrew N. Antoszyk, Howard S. Ying, and Vasily N. Astratov "Focusing capability of integrated chains of microspheres in the limit of geometrical optics", Proc. SPIE 7913, Laser Resonators and Beam Control XIII, 79131A (18 February 2011); https://doi.org/10.1117/12.876139

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