Characterization of photonic nanojets formed by dielectric microfibers

Joseph Dise, Arash Darafsheh

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


Dielectric microelements with cylindrical and spherical shapes can form an intense sharply focused optical beam, termed "photonic nanojet". Novel optical devices based on photonic nanojet effect can possibly be used in a broad range of biomedical and photonics applications, including super-resolution microscopy, laser tissue surgery, optical endoscopy and spectroscopy, photo-patterning of thin films, and photovoltaics. The use of photonic nanojets in such devices requires meticulous tuning of several parameters of the focusing element and the light source. In this work, we investigated the multifactorial parameterization of photonic nanojets using finite difference time domain (FDTD) simulations. Input parameters that are investigated include index of refraction (1.2-2.2) and diameter (5-50 μm) of the microfiber. In each simulation, the focusing element was illuminated with a plane wave. For each parameter set, the characteristic parameters of the nanojets, such as lateral resolution, back focal length, and the maximum electric field amplification were calculated. Our results showed that optimal values of electric field amplification, back focal length, and lateral resolution do not occur under the same initial parameterization and tend to trade-off with one another. Detailed results from our investigation will provide insight for future tailoring of nanojet properties of microelements in design of novel optical devices for nanophotonics applications.

Original languageEnglish
Title of host publicationIntegrated Optics
Subtitle of host publicationDevices, Materials, and Technologies XXIII
EditorsSonia M. Garcia-Blanco, Pavel Cheben
ISBN (Electronic)9781510624849
StatePublished - 2019
EventIntegrated Optics: Devices, Materials, and Technologies XXIII 2019 - San Francisco, United States
Duration: Feb 4 2019Feb 7 2019

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceIntegrated Optics: Devices, Materials, and Technologies XXIII 2019
Country/TerritoryUnited States
CitySan Francisco


  • Finite-difference time-domain
  • Focusing
  • Microelement
  • Photonic nanojet
  • Simulation


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