Photonic nanojet-induced modes: Fundamentals and applications

Arash Darafsheh, Anatole Lupu, S. A. Burand, Thomas C. Hutchens, Nathaniel M. Fried, Vasily N. Astratov

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

11 Scopus citations


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.

Original languageEnglish
Title of host publicationIntegrated Optics
Subtitle of host publicationDevices, Materials, and Technologies XVI
StatePublished - 2012
EventIntegrated Optics: Devices, Materials, and Technologies XVI - San Francisco, CA, United States
Duration: Jan 23 2012Jan 25 2012

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


ConferenceIntegrated Optics: Devices, Materials, and Technologies XVI
Country/TerritoryUnited States
CitySan Francisco, CA


  • focusing
  • laser surgery
  • microlens
  • microoptics
  • microspheres
  • optical microprobes
  • photonic nanojet


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