Micro-compound parabolic concentrator arrays as alternatives to microlens arrays

Benjamin Cohen; Zachary Darling; Robert Johnson; Madhavi Seetamraju; James Johnson; Christopher Roberts

doi:10.1117/12.3013509

7 June 2024 Micro-compound parabolic concentrator arrays as alternatives to microlens arrays

Benjamin Cohen, Zachary Darling, Robert Johnson, Madhavi Seetamraju, James Johnson, Christopher Roberts

Proceedings Volume 13030, Image Sensing Technologies: Materials, Devices, Systems, and Applications XI; 1303005 (2024) https://doi.org/10.1117/12.3013509
Event: SPIE Defense + Commercial Sensing, 2024, National Harbor, Maryland, United States

Abstract

Single photon sensitive detectors, such as avalanche photo diodes, require optical components to concentrate incident light onto the relatively small active area of each individual pixel. These concentrators have traditionally taken the form of micro-lens arrays (MLA). However, the existing manufacturing processes limit the achievable f-number for these micro-lenses, which in turn limits the maximum achievable acceptance angle of the front-end optical system. Microcompound parabolic concentrators (µCPC), similar to those used in solar arrays, provide an alternate design to microlens arrays that can enable greater light collection for detectors from faster optical system front ends. The µCPC design is fully reflective, wavelength agnostic, and the acceptance f-number is limited only by the detector active area and pixel pitch, making them ideal for fast, low SWaP optical systems. This paper provides an overview of design and fabrication techniques for the optical concentrators.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Benjamin Cohen, Zachary Darling, Robert Johnson, Madhavi Seetamraju, James Johnson, and Christopher Roberts "Micro-compound parabolic concentrator arrays as alternatives to microlens arrays", Proc. SPIE 13030, Image Sensing Technologies: Materials, Devices, Systems, and Applications XI, 1303005 (7 June 2024); https://doi.org/10.1117/12.3013509

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