New vistas in solar concentration with gradient-index optics

Panagiotis Kotsidas, Vijay Modi, Jeffrey M. Gordon

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


Certain classes of gradient-index lenses can achieve both perfect imaging and flux concentration at the fundamental limits. Although useful in microwave technology, eponymous Luneburg lenses have been viewed as esoteric idealizations for visible and near-infrared radiation due to the paucity of suitable materials and fabrication methods. We show that the classic Luneburg problem was constrained in subtle, implicit ways that can be relaxed. With the extra degrees of freedom, we demonstrate new gradient-index profiles that can accommodate both realistic, readily available materials and existing manufacturing technologies, while compromising neither perfect imaging nor maximum concentration (confirmed by raytrace simulation) - thereby opening new vistas for solar concentration and other visible and near-infrared applications. Specifically, the broader genres of solutions identified here permit a far smaller range of refractive indices than previously believed, with minimum required refractive index values well above unity, at arbitrary lens f-number, with less sensitivity to dispersion losses than conventional lenses.

Original languageEnglish
Title of host publicationNonimaging Optics
Subtitle of host publicationEfficient Design for Illumination and Solar Concentration VIII
StatePublished - 17 Oct 2011
EventNonimaging Optics: Efficient Design for Illumination and Solar Concentration VIII - San Diego, CA, United States
Duration: 21 Aug 201122 Aug 2011

Publication series

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


ConferenceNonimaging Optics: Efficient Design for Illumination and Solar Concentration VIII
Country/TerritoryUnited States
CitySan Diego, CA

ASJC Scopus subject areas

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


Dive into the research topics of 'New vistas in solar concentration with gradient-index optics'. Together they form a unique fingerprint.

Cite this