Refocusing capabilities in a miniaturized multi-channel multi-resolution imaging system using a tunable lens

Onderzoeksoutput: Conference paper

4 Citaten (Scopus)

Samenvatting

Inspired by nature, many application domains might gain from combining the multi-channel design of the compound eyes of insects and the refocusing capability of the human eye in one compact configuration. Multi-channel refocusing imaging systems are nowadays only commercially available in bulky and expensive designs since classical refocusing mechanisms cannot be integrated in a miniaturized configuration. We designed a wafer-level multi-resolution two-channel imaging system with refocusing capabilities using a voltage tunable liquid lens. One channel is able to capture a wide field-of-view image (2x40 degrees) of a surrounding with a low angular resolution (0.078 degrees), whereas a detailed image of a small region of interest (2x7.57 degrees) can be obtained with the high angular resolution channel (0.0098 degrees). The latter high angular resolution channel contains the tunable lens and therefore also the refocusing capabilities. In this paper, we first discuss the working principle, tunability and optical quality of a voltage tunable liquid lens. Based on optical characterization measurements with a Mach-Zehnder interferometer, we designed a tunable lens model. The designed tunable lens model and its validation in an imaging setup show a diffraction-limited image quality. Following, we discuss the performance of the designed two-channel imaging system. Both the wide field-of-view and high angular resolution optical channels show a diffraction-limited performance, ensuring a good image quality. Moreover, we obtained an improved depth-of-field, from 0.254m until infinity, in comparison with the current state-of-the art published wafer-level multi-channel imaging systems, which show a depth-of-field from 9m until infinity.
Originele taal-2English
TitelOptics, Photonics and digital technologies for multimedia applications III
UitgeverijSPIE
Pagina's913809
Aantal pagina's1
Volume9138
ISBN van geprinte versie978-1-62841-086-0
StatusPublished - 2014
EvenementSPIE Optics, Photonics, and Digital Technologies for Multimedia Applications III - Brussels, Belgium
Duur: 16 apr 201417 apr 2014

Publicatie series

NaamProc. SPIE, 2014

Conference

ConferenceSPIE Optics, Photonics, and Digital Technologies for Multimedia Applications III
LandBelgium
StadBrussels
Periode16/04/1417/04/14

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