University of Illinois Urbana-Champaign

Fabrication of Photonic Nanojet (PNJ) Generators with a Graded Index (GRIN) Profile

Littlefield, Alexander

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https://hdl.handle.net/2142/107829

Description

Title
Fabrication of Photonic Nanojet (PNJ) Generators with a Graded Index (GRIN) Profile
Author(s)
Littlefield, Alexander
Contributor(s)
Goddard, Lynford
Issue Date
2020-05
Keyword(s)
  • photonic nanojet
  • graded index
  • direct laser writing
  • porous silicon
  • micro-optics
Abstract
A photonic nanojet (PNJ) is a non-evanescent beam of light with a subdiffraction width that can propagate over a distance greater than one wavelength. Currently, PNJs are generated primarily with microspheres. Other designs, including a low refractive index profile with many layers, have been simulated to produce controllable focal characteristics. In this work, we propose a new graded index design. We investigate whether these designs can be fabricated by two-photon direct laser writing using polymer in a porous silicon (PSi) substrate. The PNJs were simulated and measured using COMSOL and confocal microscopy, respectively. Furthermore, the devices were imaged in 3D with multiphoton microscopy to determine and correct nonidealities that prevent optimal performance. Potential applications for these new PNJs include higher resolution lithography, optical trapping, and imaging.
Type of Resource
  • text
  • moving image
Language
en
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http://hdl.handle.net/2142/107829

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