Imaging across the Short-Wave Infra-Red (SWIR) Band via a Flat Multilevel Diffractive Lens
Monjurul Meem, Sourangsu Banerji, Apratim Majumder, Curt Dvonch,, Berardi Sensale-rodriguez, and Rajesh Menon
TL;DR
This paper presents the design and fabrication of a flat, achromatic multi-level diffractive lens for the SWIR band, demonstrating its imaging capabilities with a compact form factor and detailed performance characterization.
Contribution
The work introduces a novel flat multi-level diffractive lens optimized for SWIR imaging, combining achromatic performance with a very thin profile.
Findings
Achromatic imaging across 875-1675nm SWIR band
High-quality point-spread and modulation-transfer functions
Effective still and video imaging performance
Abstract
We designed and fabricated a flat multi-level diffractive lens (MDL) that is achromatic in the SWIR band (875nm to 1675nm). The MDL had a focal length of 25mm, aperture diameter of 8.93mm and thickness of only 2.6um. By pairing the MDL with a SWIR image sensor, we also characterized its imaging performance in terms of the point-spread functions, modulation-transfer functions, and still and video imaging.
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Taxonomy
TopicsPhotonic and Optical Devices · Optical Wireless Communication Technologies · Metamaterials and Metasurfaces Applications