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Proceedings Paper

Photonic nanojet-induced modes: fundamentals and applications
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Paper Abstract

Photonic nanojet-induced modes (NIMs) have emerged as a new paradigm for understanding the optical properties of chains of dielectric microspheres with wavelength-scale diameters (D≤10λ). Here we show that light focusing and transport properties of chains of submillimeter spheres (D>100λ) are dominated by periodically focused modes (PFMs) which can be considered a geometrical optics analog of NIMs. We review recent geometrical optics results on this subject showing that Brewster angle conditions for TM polarized rays can be periodically reproduced in chains of spheres with index n= √3 =1.73205... giving rise to lossless PFMs with the 2D period. In this work we studied the phase properties of PFMs using a novel method based on Fourier analysis of the high resolution transmission spectra of chains of submillimeter ruby spheres with n~1.75 at λ=1.2 μm. We demonstrated that PFMs are the best surviving modes in long chains of spheres. Finally, we considered applications of PFMs for focusing multimodal beams in ultra-precise laser surgery.

Paper Details

Date Published: 2 February 2012
PDF: 8 pages
Proc. SPIE 8264, Integrated Optics: Devices, Materials, and Technologies XVI, 82640X (2 February 2012); doi: 10.1117/12.909716
Show Author Affiliations
Arash Darafsheh, The Univ. of North Carolina at Charlotte (United States)
Anatole Lupu, Institut d'Electronique Fondamentale, CNRS, Univ. Paris-Sud 11 (France)
S. Adam Burand, The Univ. of North Carolina at Charlotte (United States)
Thomas C. Hutchens, The Univ. of North Carolina at Charlotte (United States)
Nathaniel M. Fried, The Univ. of North Carolina at Charlotte (United States)
Vasily N. Astratov, The Univ. of North Carolina at Charlotte (United States)


Published in SPIE Proceedings Vol. 8264:
Integrated Optics: Devices, Materials, and Technologies XVI
Jean Emmanuel Broquin; Gualtiero Nunzi Conti, Editor(s)

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