Simulation method for large subwavelength devices in infrared imaging systems and comparison with experiment

Quentin Abadie; Luc André; Abdelkader Aliane; Johan Rothman

doi:10.1117/12.2287807

21 February 2018 Simulation method for large subwavelength devices in infrared imaging systems and comparison with experiment

Quentin Abadie, Luc André, Abdelkader Aliane, Johan Rothman

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Proceedings Volume 10542, High Contrast Metastructures VII; 1054211 (2018) https://doi.org/10.1117/12.2287807
Event: SPIE OPTO, 2018, San Francisco, California, United States

Abstract

In the field of uncooled Long Wave Infra Red (LWIR) imaging, CMOS compatible bolometers technology is being more and more popular, exhibiting precise temperature measurement at moderate cost. The price of this technology is proportional to the number of components produced per wafer, leading to a shrinkage of the pixel. Enhancing the resolution level of the focal plane array (FPA) requires an improvement of the point spread function (PSF) of the optical system, leading to more and more complex aspheric lenses, and an increased cost of imaging systems. We propose to add a sub-wavelength blade to the existing parts of the imaging system to ease the overall improvement of the image quality in applications with a constraint budget. The main function of such a subwavelength blade should be to control the phase of the light into an optical system to compensate optical aberrations. A cost effective solution consists to make such devices using microelectronics based collective fabrication process. The main difficulty is to predict the subwavelength blade behavior within an optical system that is to say combining millimeter sized optical components that are modeled using ray-tracing or electromagnetic simulations. In this paper we present the results obtained from an effort to simulate, fabricate and characterize all-dielectric subwavelength blade. In an imaging system, our devices will have to deal with non-flat wavefronts. Our method is based on Fourier Modal Method and Angular Spectrum Method to simulate subwavelength optics into such an optical system. Finally, we have compared our simulations results to experiments on basic examples, like spherical aberration correction of a commercial lens.

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Quentin Abadie, Luc André, Abdelkader Aliane, and Johan Rothman "Simulation method for large subwavelength devices in infrared imaging systems and comparison with experiment", Proc. SPIE 10542, High Contrast Metastructures VII, 1054211 (21 February 2018); https://doi.org/10.1117/12.2287807

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KEYWORDS

Imaging systems

Wavefronts

Monochromatic aberrations

Ray tracing

Zemax

Infrared imaging

Geometrical optics

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