Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 113, Issue 15, Pages 3982-3985Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1517953113
Keywords
bioinspired optical devices; low-light imaging; microopto-electromechanical systems; femtosecond laser micromachining; low aberrations
Categories
Funding
- National Institutes of Health [1DP2OD008678-01]
- National Science Foundation [1329481]
- University of Wisconsin-Madison College of Engineering
- Direct For Computer & Info Scie & Enginr
- Division Of Computer and Network Systems [1329481] Funding Source: National Science Foundation
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The ability to acquire images under low-light conditions is critical for many applications. However, to date, strategies toward improving low-light imaging primarily focus on developing electronic image sensors. Inspired by natural scotopic visual systems, we adopt an all-optical method to significantly improve the overall photosensitivity of imaging systems. Such optical approach is independent of, and can effectively circumvent the physical and material limitations of, the electronics imagers used. We demonstrate an artificial eye inspired by superposition compound eyes and the retinal structure of elephantnose fish. The bioinspired photosensitivity enhancer (BPE) that we have developed enhances the image intensity without consuming power, which is achieved by three-dimensional, omnidirectionally aligned microphotocollectors with parabolic reflective sidewalls. Our work opens up a previously unidentified direction toward achieving high photosensitivity in imaging systems.
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