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Proceedings Paper

Optimizing a sub-wavelength grating lens for large incidence angles
Author(s): Lukas Elsinger; Peter Hadley; Rainer Minixhofer; Anderson Singulani
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Paper Abstract

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).

Paper Details

Date Published: 20 August 2015
PDF: 4 pages
Proc. SPIE 9556, Nanoengineering: Fabrication, Properties, Optics, and Devices XII, 95560O (20 August 2015); doi: 10.1117/12.2187784
Show Author Affiliations
Lukas Elsinger, ams AG (Austria)
Graz Univ. of Technology (Austria)
Peter Hadley, Graz Univ. of Technology (Austria)
Rainer Minixhofer, ams AG (Austria)
Anderson Singulani, ams AG (Austria)

Published in SPIE Proceedings Vol. 9556:
Nanoengineering: Fabrication, Properties, Optics, and Devices XII
Eva M. Campo; Elizabeth A. Dobisz; Louay A. Eldada, Editor(s)

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