Optimizing a sub-wavelength grating lens for large incidence angles

Lukas Elsinger; Peter Hadley; Rainer Minixhofer; Anderson Singulani

doi:10.1117/12.2187784

20 August 2015 Optimizing a sub-wavelength grating lens for large incidence angles

Lukas Elsinger, Peter Hadley, Rainer Minixhofer, Anderson Singulani

Proceedings Volume 9556, Nanoengineering: Fabrication, Properties, Optics, and Devices XII; 95560O (2015) https://doi.org/10.1117/12.2187784
Event: SPIE Nanoscience + Engineering, 2015, San Diego, California, United States

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).

Citation Download Citation

Lukas Elsinger, Peter Hadley, Rainer Minixhofer, and Anderson Singulani "Optimizing a sub-wavelength grating lens for large incidence angles", Proc. SPIE 9556, Nanoengineering: Fabrication, Properties, Optics, and Devices XII, 95560O (20 August 2015); https://doi.org/10.1117/12.2187784

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