Focusing microprobes based on integrated chains of microspheres

Vasily N. Astratov, Arash Darafsheh, Matthew D. Kerr, Kenneth W. Allen, Nathaniel M. Fried

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


The concept of nanoscale photonic jets has emerged as a novel way of focusing light with subwavelength spatial resolution. Practical focusing systems are, however, limited in their resolution by the multimodal structure of beams delivered by flexible waveguides or fibers. In this work, by using numerical modeling, we show that the chains of microspheres assembled inside the bores of the hollow waveguides or microcapillaries provide significant advantages over single lenses in such applications. It is also shown that the chains of microspheres are capable of focusing light in contact with tissue. Experimental studies are performed for spheres with sizes from 10 to 300 μm with different indices of refraction ranging from 1.47 to 1.9. The focusing and transport properties of such chains are found to be in good agreement with numerical modeling results.

Original languageEnglish (US)
Title of host publicationPIERS 2010 Cambridge - Progress in Electromagnetics Research Symposium, Proceedings
Number of pages5
StatePublished - 2010
Externally publishedYes
EventProgress in Electromagnetics Research Symposium, PIERS 2010 Cambridge - Cambridge, MA, United States
Duration: Jul 5 2010Jul 8 2010


OtherProgress in Electromagnetics Research Symposium, PIERS 2010 Cambridge
Country/TerritoryUnited States
CityCambridge, MA

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials


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