Silicon is a common material of choice for semiconductor optics in the infrared spectral range,due to its low cost,well-developed high-volume manufacturing methods,high refractive index,and transparency.It is,however,...Silicon is a common material of choice for semiconductor optics in the infrared spectral range,due to its low cost,well-developed high-volume manufacturing methods,high refractive index,and transparency.It is,however,typically ill-suited for applications in the visible range,due to its large absorption coefficient,especially for green and blue light.Counterintuitively,we demonstrate how ultra-thin crystalline meta-optics enable full-color imaging in the visible range.For this purpose,we employ an inverse design approach,which maximizes the volume under the broadband modulation transfer function of the meta-optics.Beyond that,we demonstrate polarization-multiplexed functionality in the visible.This is particularly important as polarization optics require high index materials,a characteristic often difficult to obtain in the visible.展开更多
Extended depth of focus(EDOF)optics can enable lower complexity optical imaging systems when compared to active focusing solutions.With existing EDOF optics,however,it is difficult to achieve high resolution and high ...Extended depth of focus(EDOF)optics can enable lower complexity optical imaging systems when compared to active focusing solutions.With existing EDOF optics,however,it is difficult to achieve high resolution and high collection efficiency simultaneously.The 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 aperture.Here,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 lens.Depth-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.展开更多
Endoscopes are an important component for the development of minimally invasive surgeries.Their size is one of the most critical aspects,because smaller and less rigid endoscopes enable higher agility,facilitate large...Endoscopes are an important component for the development of minimally invasive surgeries.Their 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 tissue.In all existing endoscopes,the size of the optics poses a major limitation in miniaturization of the imaging system.Not only is making small optics difficult,but their performance also degrades with downscaling.Meta-optics have recently emerged as a promising candidate to drastically miniaturize optics while achieving similar functionalities with significantly reduced size.Herein,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)lenses.We 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 itself.Our work shows the potential of meta-optics for integration and miniaturization of biomedical devices towards minimally invasive surgery.展开更多
基金supported by DARPA W31P4Q21C0043.Part of this work was conducted at the Washington Nanofabrication Facility/Molecular Analysis Facility,a National Nanotechnology Coordinated Infrastructure(NNCI)site at the University of Washington,with partial support from the National Science Foundation via awards NNCI-1542101,and NNCI-2025489.
文摘Silicon is a common material of choice for semiconductor optics in the infrared spectral range,due to its low cost,well-developed high-volume manufacturing methods,high refractive index,and transparency.It is,however,typically ill-suited for applications in the visible range,due to its large absorption coefficient,especially for green and blue light.Counterintuitively,we demonstrate how ultra-thin crystalline meta-optics enable full-color imaging in the visible range.For this purpose,we employ an inverse design approach,which maximizes the volume under the broadband modulation transfer function of the meta-optics.Beyond that,we demonstrate polarization-multiplexed functionality in the visible.This is particularly important as polarization optics require high index materials,a characteristic often difficult to obtain in the visible.
文摘Extended depth of focus(EDOF)optics can enable lower complexity optical imaging systems when compared to active focusing solutions.With existing EDOF optics,however,it is difficult to achieve high resolution and high collection efficiency simultaneously.The 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 aperture.Here,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 lens.Depth-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.
基金supported by NSF-GCR-2120774the National Science Foundation via awards NNCI-1542101 and NNCI-2025489.
文摘Endoscopes are an important component for the development of minimally invasive surgeries.Their 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 tissue.In all existing endoscopes,the size of the optics poses a major limitation in miniaturization of the imaging system.Not only is making small optics difficult,but their performance also degrades with downscaling.Meta-optics have recently emerged as a promising candidate to drastically miniaturize optics while achieving similar functionalities with significantly reduced size.Herein,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)lenses.We 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 itself.Our work shows the potential of meta-optics for integration and miniaturization of biomedical devices towards minimally invasive surgery.
