Optimizing a sub-wavelength grating lens for large incidence angles

Lukas Elsinger*, Peter Hadley, Rainer Minixhofer, Anderson Singulani

*Corresponding author for this work

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


Flat transmissive lens designs for infrared sensor applications based on sub-wavelength gratings were analyzed using a finite difference time domain program (Lumerical). An initial design for broadband transmission with a design wavelength of 4μm exhibited a drop in the transmittance for large incidence angles that caused defocusing. This was investigated numerically and a phenomenological explanation is presented. The sub- wavelength structure was then optimized to work also for large incidence angles. The focal spot of the proposed lens was characterized using a finite element method package (Comsol). Downloading of the abstract is permitted for personal use only.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
ISBN (Print)9781628417227
Publication statusPublished - 2015
EventNanoengineering: Fabrication, Properties, Optics, and Devices XII - San Diego, United States
Duration: 11 Aug 201512 Aug 2015


ConferenceNanoengineering: Fabrication, Properties, Optics, and Devices XII
Country/TerritoryUnited States
CitySan Diego


  • IR Imaging
  • Sub-wavelength Grating Lens

ASJC Scopus subject areas

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


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