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Fast extended depth of focus meta-optics for varifocal functionality

Photonics Research 2022年第3期10卷 828-833页

作者： James E.M.Whitehead Alan Zhan Shane Colburn Luocheng Huang Arka Majumdar Department of Electrical and Computer Engineering University of WashingtonSeattleWashingtonD.C.98195USA tunoptix SeattleWashingtonD.C.98195USA Department of Physics University of WashingtonSeattleWashingtonD.C.98195USA

Extended depth of focus(EDOF)optics can enable lower complexity optical imaging systems when compared to active focusing *** existing EDOF optics,however,it is difficult to achieve high resolution and high collection efficiency *** subwavelength spacing of scatterers in a meta-optic enables the engineering of very steep phase gradients;thus,meta-optics can achieve both a large physical aperture and a high numerical ***,we demonstrate a fast(f/1.75)EDOF meta-optic operating at visible wavelengths,with an aperture of 2 mm and focal range from 3.5 mm to 14.5 mm(286 diopters to 69 diopters),which is a 250×elongation of the depth of focus relative to a standard ***-independent performance is shown by imaging at a range of finite conjugates,with a minimum spatial resolution of∼9.84μm(50.8 cycles/mm).We also demonstrate operation of a directly integrated EDOF meta-optic camera module to evaluate imaging at multiple object distances,a functionality which would otherwise require a varifocal lens.

关键词： optics enable otherwise

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Real time full-color imaging in a Meta-optical fiber endoscope

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eLight 2023年第1期3卷 147-154页

作者： Johannes E.Froch Luocheng Huang Quentin A.A.Tanguy Shane Colburn Alan Zhan Andrea Ravagli Eric J.Seibel Karl F.Bohringer Arka Majumdar Department of Physics University of WashingtonSeattleWA 98195USA Department of Electrical and Computer Engineering University of WashingtonSeattleWA 98195USA tunoptix Fluke Hall4000 Mason Road 300WA 98195 SeattleUSA SCHOTT North America Inc.SouthbridgeMA 01550USA Department of Mechanical Engineering University of WashingtonSeattleWA 98195USA Department of Bioengineering University of WashingtonSeattleWA 98195USA Institute for Nano-Engineered Systems University of WashingtonSeattleWA 98195USA

Endoscopes are an important component for the development of minimally invasive *** size is one of the most critical aspects,because smaller and less rigid endoscopes enable higher agility,facilitate larger accessibility,and induce less stress on the surrounding *** all existing endoscopes,the size of the optics poses a major limitation in miniaturization of the imaging *** only is making small optics difficult,but their performance also degrades with ***-optics have recently emerged as a promising candidate to drastically miniaturize optics while achieving similar functionalities with significantly reduced ***,we report an inverse-designed meta-optic,which combined with a coherent fiber bundle enables a 33%reduction in the rigid tip length over traditional gradient-index(GRIN)*** use the meta-optic fiber endoscope(MOFIE)to demonstrate real-time video capture in full visible color,the spatial resolution of which is primarily limited by the fiber *** work shows the potential of meta-optics for integration and miniaturization of biomedical devices towards minimally invasive surgery.

关键词： Endoscopy Meta-optics Nano-fabrication Biomedical engineering

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