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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Volume7913
DOIs
StatePublished - 2011
Externally publishedYes
EventLaser Resonators and Beam Control XIII - San Francisco, CA, United States
Duration: Jan 23 2011Jan 25 2011

Other

OtherLaser Resonators and Beam Control XIII
CountryUnited States
CitySan Francisco, CA
Period1/23/111/25/11

Fingerprint

Geometrical optics
Geometrical Optics
Microspheres
geometrical optics
Laser
surgery
Surgery
Laser surgery
piercing
Piercing
Infrared lasers
Aluminum Oxide
Sapphire
Ray Tracing
Mid-infrared
Ray tracing
Tubing
Dyes
Photonics
ray tracing

Keywords

  • Focusing
  • Geometrical optics design
  • Laser surgery
  • Medical optics
  • Microlens
  • Microoptics
  • Microspheres
  • Ophthalmic optics and devices
  • Optical microprobes

ASJC Scopus subject areas

  • Applied Mathematics
  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Darafsheh, A., Allen, K. W., Fardad, A., Fried, N. M., Antoszyk, A. N., Ying, H. S., & Astratov, V. N. (2011). Focusing capability of integrated chains of microspheres in the limit of geometrical optics. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 7913). [79131A] https://doi.org/10.1117/12.876139

Focusing capability of integrated chains of microspheres in the limit of geometrical optics. / Darafsheh, Arash; Allen, Kenneth W.; Fardad, Amir; Fried, Nathaniel M.; Antoszyk, Andrew N.; Ying, Howard S.; Astratov, Vasily N.

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 7913 2011. 79131A.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Darafsheh, A, Allen, KW, Fardad, A, Fried, NM, Antoszyk, AN, Ying, HS & Astratov, VN 2011, Focusing capability of integrated chains of microspheres in the limit of geometrical optics. in Proceedings of SPIE - The International Society for Optical Engineering. vol. 7913, 79131A, Laser Resonators and Beam Control XIII, San Francisco, CA, United States, 1/23/11. https://doi.org/10.1117/12.876139
Darafsheh A, Allen KW, Fardad A, Fried NM, Antoszyk AN, Ying HS et al. Focusing capability of integrated chains of microspheres in the limit of geometrical optics. In Proceedings of SPIE - The International Society for Optical Engineering. Vol. 7913. 2011. 79131A https://doi.org/10.1117/12.876139
Darafsheh, Arash ; Allen, Kenneth W. ; Fardad, Amir ; Fried, Nathaniel M. ; Antoszyk, Andrew N. ; Ying, Howard S. ; Astratov, Vasily N. / Focusing capability of integrated chains of microspheres in the limit of geometrical optics. Proceedings of SPIE - The International Society for Optical Engineering. Vol. 7913 2011.
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