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Applied Physics Letters / Volume 100 / Issue 6 / PHOTONICS AND OPTOELECTRONICS

Appl. Phys. Lett. 100, 061123 (2012); http://dx.doi.org/10.1063/1.3684246 (4 pages)

Periodically focused modes in chains of dielectric spheres

Arash Darafsheh and Vasily N. Astratov

Department of Physics and Optical Science, Center for Optoelectronics and Optical Communications, University of North Carolina at Charlotte, Charlotte, North Carolina 28223-0001, USA

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(Received 25 December 2011; accepted 24 January 2012; published online 10 February 2012)

We show that, theoretically, Brewster angle conditions for transverse magnetic polarized rays can be periodically reproduced in chains of spheres with index n = math giving rise to lossless periodically focused modes with 2D period, where D is the sphere diameter. Using ray tracing for a spherical emitter with the diameter D we show that chains of spheres work as filters of such modes at 1.72 < n < 1.85. This leads to tapering of the focused beams combined with the reduction of their attenuation along the chain. Experimentally, the “beam tapering” effect was observed in chains of 300 μm sapphire spheres with index ∼1.77 in visible.

© 2012 American Institute of Physics

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KEYWORDS, PACS, and IPC

Keywords

dielectric materials, light polarisation, optical focusing, optical materials, optical waveguides, ray tracing, sapphire

PACS

International Patent Classification (IPC)

  • G02B6/10

    Of the optical waveguide type

  • G02B27/40

    Optical focusing aids

  • G03B3/00

    Focusing arrangements of general interest for cameras, projectors or printers

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3684246

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    S. Yang and V. N. Astratov, Appl. Phys. Lett. 93, 261111 (2008)APPLAB000092000026261111000001.


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