Proof-of-concept demonstration of a miniaturized multi-resolution refocusing imaging system using an electrically tunable lens

Research output: Chapter in Book/Report/Conference proceedingConference paper

2 Citations (Scopus)

Abstract

Refocusing multi-channel imaging systems are nowadays commercially available only in bulky and expensive designs. Compact wafer-level multi-channel imaging systems have until now only been published without refocusing mechanisms, since classical refocusing concepts could not be integrated in a miniaturized configuration. This lack of refocusing capabilities limits the depth-of-field of these imaging designs and therefore their application in practical systems. We designed and characterized a wafer-level two-channel multi-resolution refocusing imaging system, based on an electrically tunable liquid lens and a design that can be realized with wafer-level mass-manufacturing techniques. One wide field-of-view channel (2x40 degrees) gives a general image of the surroundings with a lower angular resolution (0.078 degrees), whereas the high angular resolution channel (0.0098 degrees) provides a detailed image of a small region of interest with a much narrower field-of-view (2x7.57 degrees). The latter high resolution imaging channel contains the tunable lens and therefore the refocusing capability. The performances of this high resolution imaging channel were experimentally characterized in a proof-of-concept demonstrator. The experimental and simulated depth-of-field and resolving power correspond well. Moreover, we are able to obtain a depth-of-field from 0.25m until infinity, which is a significant improvement of the current state-of-the-art static multi-channel imaging systems, which show a depth-of-field from 9m until infinity. Both the high resolution and wide field-of-view imaging channels show a diffraction-limited image quality. The designed wafer-level two-channel imaging system can form the basis of an advanced three-dimensional stacked image sensor, where different image processing algorithms can be simultaneously applied to the different images on the image sensor.
Original languageEnglish
Title of host publicationProc. SPIE, 2014
PublisherSPIE
Number of pages10
Volume9192
ISBN (Print)978-1-62841-219-2
Publication statusPublished - 2014
EventSPIE Current Developments in Lens Design and Optical Engineering XV - San Diego, CA, United States
Duration: 18 Aug 201420 Aug 2014

Conference

ConferenceSPIE Current Developments in Lens Design and Optical Engineering XV
CountryUnited States
CitySan Diego, CA
Period18/08/1420/08/14

Keywords

  • ARTIFICIAL COMPOUND EYES; MULTICHANNEL

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