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current developments in lens design and optical engineering xxii

Current Developments in Lens Design and Optical Engineering ...

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current developments in lens design and optical engineering xxii 2021

ISBN: (纸本)9781510644663

The proceedings contain 17 papers. The topics discussed include: 360 degree white light holography display on surface of transparency conical cup;depth-of-field comparison between the plenoptic camera 1.0 and 2.0;wide gamut lighting and color contrast in anomalous trichromacy;iterative and inverse design of a segmented reflector for uniform illumination on the road;effects of multilayer thin film coatings on different thermochromic materials for thermal storage applications;talbot effect from structures with periodic Bessel and sinusoidal profiles;large volumetric optical-resolution photoacoustic microscopy with image fusion based on CNN feature extraction;and an optimal lens arrangement in high numerical aperture objectives.

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An Optimal lens arrangement in high numerical aperture objectives 22

An Optimal lens arrangement in high numerical aperture objec...

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Conference on current developments in lens design and optical engineering xxii

作者： Ryzhikov, Lev Independent Researcher (United States)

ISBN: (数字)9781510644670

ISBN: (纸本)9781510644670

Demand for High NA objective lenses with diffraction limited image quality is growing. This demand translates in design more complex optical system with many optical components. In order to optimize the most favorable arrangement of optical components new design methodology based on functional separation lens group in high numerical aperture (NA) objective was developed. For this purpose, all lens components were divided on the three-lens group: front group, middle group and output lens group. The front lens group includes front lens (thick meniscus for dry type of objective or thick piano-convex lens for immersion objective) and several a planatic shape meniscus lenses. The middle lens group consists of several cemented lens components (doublets or triplets) and output lens group includes "Double Gauss" lens system or combination of cemented doublet with one or two singlet lenses. The total number of lenses in such types of optical system can reach 15-16 or even more. design an optimal composition (optical components arrangement) for high numerical aperture objective lens will be discussed. Quantitative related parameter for optimal objective lens component's structure will be proposed.

关键词： Objectives Glasses Refractive index optical components Microscopes Monochromatic aberrations Aberration correction Chromatic aberrations Flint glass Crown glass

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Iterative and inverse design of a segmented reflector for uniform illumination on the road 22

Iterative and inverse design of a segmented reflector for un...

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Conference on current developments in lens design and optical engineering xxii

作者： Wu, Rubing Alisafaee, Hossein Rose Hulman Inst Technol Dept Phys & Opt Engn 5500 Wabash Ave Terre Haute IN 47803 USA

ISBN: (数字)9781510644670

ISBN: (纸本)9781510644670

We demonstrate an iterative and inverse design of a segmented reflector used to illuminate the road with a uniform light distribution and reduced glare to the oncoming traffic. design is set to meet the StVZO standard. The maximum brightness obtained is 1460 candela, which is five times brighter than a conventional headlamp of urban shared electric scooters and bicycles, resulting in improved visibility in dark environments. A prototype was built and tested at various environments. The tolerance analysis showed no negative influence on the desired standard light distribution. In addition to this iterative approach, a ray tracing code has been developed for inverse design and to map a desired uniform road illumination pattern back to the candela sensor for corresponding reflector design.

关键词： optical design Illumination Reflector design design for manufacturing Lucid-Shape

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Methodology to design mobile-based camera lenses using freeform surfaces 22

Methodology to design mobile-based camera lenses using freef...

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Conference on current developments in lens design and optical engineering xxii

作者： Zhuang, Zhenfeng Dallaire, Xavier Parent, Jocelyn Roulet, Patrice Thibault, Simon Immervision Inc 2020 Robert Bourassa BlvdSuite 2320 Montreal PQ H2A 2A5 Canada Univ Laval Ctr Opt Photon & Laser Dept Phys Genie Phys & Opt 2375 Rue Terrasse Quebec City PQ G1V 0A6 Canada

ISBN: (数字)9781510644670

ISBN: (纸本)9781510644670

Freeform technology is one of the most promising solutions for enhancing the capability of aberration correction and improving performance of optical systems. Aiming to demonstrate the freedom and flexibility of optical system design, several challenging design examples using freeform surface are presented, including two wide-angle camera lenses adopting even and odd pedal polynomial formulations for symmetric optical surface description, and an anamorphic cinema lens employing non-rotationally symmetric surfaces for capturing a wider aspect ratio and offering a 1.33 x squeeze factor on a 4:3 sensor size. Methods and constraints for designing and optimizing the optical systems are discussed. The optical performances of these design examples are analyzed and the results verify the practicability and effectiveness of the proposed formulations and design strategies in the field of freeform imaging optical design.

关键词： lens system design optical systems geometric optical design aspherics

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Locating the local minima in lens design with machine learning 22

Locating the local minima in lens design with machine learni...

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Conference on current developments in lens design and optical engineering xxii

作者： Kononova, Anna, V Shir, Ofer M. Tukker, Teus Frisco, Pierluigi Zeng, Shutong Back, Thomas Leiden Univ LIACS Leiden Netherlands Tel Hai Coll Comp Sci Dept Upper Galilee Israel Migal Inst Upper Galilee Israel ASML BV Veldhoven Netherlands

ISBN: (数字)9781510644670

ISBN: (纸本)9781510644670

We applied an extended version of the Niching-CMA-ES heuristic to search for local minima of the Cooke triplet, a renowned photographic lens design, of which 21 local minima were already known. The considered problem is defined by 6 input (decision) variables, namely the curvatures of the three lenses present in the Cooke triplet, and is driven by a single objective function, that is the RMS spot size. The applied approach found: (i) 19 out of the 21 known minima in a single run;(ii) 540 new local minima with objective values lower/equal to those of the known 21 minima;(iii) a large number of infeasible designs.

关键词： Cooke triplet local minima niching evolution strategy machine learning multimodal search landscapes

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design of Ultrashort Throw lenses with Catadioptric Relays for Curved Screens 22

Design of Ultrashort Throw Lenses with Catadioptric Relays f...

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Conference on current developments in lens design and optical engineering xxii

作者： Nishikawa, Jun Nishiyama, Mariko Sony Grp Corp R&D Ctr Atsugi TEC 4-14-1 Asahi Cho Atsugi Kanagawa 2430014 Japan

ISBN: (数字)9781510644670

ISBN: (纸本)9781510644670

An ultrashort throw lens with a catadioptric relay (USTCR) for curved screens has a half-field angle greater than 110 degrees. The angle of the principal ray incident on the aspherical mirror increases according to the height of the ray emitted from the object surface. A larger field angle leads to larger sag amount. Thus, the degree of difficulty in precision machining increases. In this study, we examined how the tangent of the concave mirror surface can be reduced such that it can be manufactured while maintaining the half-field angle and its optical performance. It was found that the interval between imaging points reaching the screen can be made constant by suppressing the change in the principal ray incident on the concave mirror by +1- 1 degrees or less, particularly in the area of a half-field angle of 90 degrees or more, and making the change in the tangent of the concave mirror surface constant. As an index of distortion, we show that the perimeter ratio (Pr) of the frame length, which was equally divided by 5 x5 in the screen, improved from 0.26 to 0.73. As one possible application, a projection system that can be realized with only 8 projectors is proposed, as opposed to conventional systems consisting of approximately 20 projectors in omni-directional projection systems.

关键词： ultrashort throw lens aspheric mirror sag amount concave mirror catadioptric relay lens lens design curved screen omni-directional projection system

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Metalens wide-angle receiver for free space optical communications 22

Metalens wide-angle receiver for free space optical communic...

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Conference on current developments in lens design and optical engineering xxii

作者： Islam, Md Shafiqul Zaman, Imam Uz Sadri-Moshkenani, Parinaz Khan, Mohammad Wahiduzzaman Boyraz, Ozdal Univ Calif Irvine Irvine CA 92717 USA

ISBN: (数字)9781510644670

ISBN: (纸本)9781510644670

Receiver field of regard is one of the major problems for free space optical (FSO) communications. Drift or vibrations in transceiver orientations reduces effective communication time. The methods implemented to overcome this limitation, often require bulky optical and complex mechanical assemblies with feedback control, that are not suitable for long run operation in an airborne system. In this paper, we propose a novel receiver system that can effectively reduce the impact of pointing errors. The system is composed of two metalenses and one off-the-shelf conventional lens. The first metalens focuses optical beam incident at different angles on the aperture, at different locations on focal plane. The second metalens is placed on the focal plane of first metalens. After passing through the second metalens, the beams become parallel to optical axis of the receiver optical system. The parallel beams are collected by a suitable off-the-shelf aspheric lens and focused back on single detector that sits on a point on the optical axis. The system is designed and analyzed by physical optics theory. With 0.5 mm receiver aperture and 50 mm diameter aspheric lens, Zemax simulation shows that the system can collect +/-5-degree incident angle with detector diameter of 273 mu m. COMSOL frequency domain simulation with smaller diameter beam shows that the efficiency of the 2 metalens system is about 80%. Efficient metalens design and beam compression at detector plane are two key features of the proposed system. The system relaxes the strict requirement of aligning the transmitter and receiver unit in FSO communication.

关键词： Metalens free space optical communication wide angle receiver

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Large volumetric optical-resolution photoacoustic microscopy with image fusion based on CNN feature extraction 22

Large volumetric optical-resolution photoacoustic microscopy...

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Conference on current developments in lens design and optical engineering xxii

作者： Li, Sihang Wang, Zhuangzhuang Cao, Xiongjun Li, Zhihui Song, Xianlin Nanchang Univ Ji Luan Acad Nanchang 330031 Jiangxi Peoples R China Nanchang Univ Sch Informat Engn Nanchang 330031 Jiangxi Peoples R China

ISBN: (数字)9781510644670

ISBN: (纸本)9781510644670

Photoacoustic imaging(PAI) is a emerging powerful and efficient imaging technology. optical-resolution photoacoustic microscopy is an useful photoacoustic imaging technique combining the advantages of both optical imaging and acoustic imaging which obtains many attractive advanges such as high resolution, high contrast and so on. Laser beam is often focused strongly to achieve high resolution. However, this will lead to a poor depth-of-field and less structural information which limits the further application of this technology. A image fusion method based on CNN feature extraction is proposed to achieve large volumetric optical-resolution photoacoustic microscopy. First, two groups of simulated 3D photoacoustic data of different focal locations were obtained through photoacoustic microscopic imaging platform. Then B-scan data were fused and maximum projection of the reconstructed 3D data is taken to display the photoacoustic information. By comparing the source images and the fused image, we show that the proposed method can be implemented to obtain large volumetric and high-resolution photoacoustic images.

关键词： photoacoustic microscopy depth expandsion image fusion convolutional neural network

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Thermally reconfigurable varifocal silicon metalens 22

Thermally reconfigurable varifocal silicon metalens

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Conference on current developments in lens design and optical engineering xxii

作者： Archetti, Anna Lin, Ren-Jie Tsoulos, Ted, V Kiani, Fatemeh Restori, Nathanael Tagliabue, Giulia Ecole Polytech Fed Lausanne STI Lab Nanosci Energy Technol LNET CH-1015 Lausanne Switzerland Univ Padua Dept Biomed Sci Neurosci I-35131 Padua Italy

ISBN: (数字)9781510644670

ISBN: (纸本)9781510644670

Active optical components are essential building blocks for a wide variety of applications such as optical communications, microscopy, and illumination systems. Reconfigurable metasurfaces, which consist of arrays of sub-wavelength meta-atoms, can be engineered to uniquely realize compact and multifunctional optical elements, enabling light-polarization dynamic-control as well as beam steering, focusing or zooming. Varifocal metalenses, in particular, have attracted increasing interests. Yet, going beyond mechanical modulation schemes to realize ultra-thin devices with fast modulation remains challenging due to the complex phase and phase-delay profiles involved. Recently, thermooptical effects in dielectric nanostructures have emerged as a promising solution to tune their optical resonances, offering unexplored opportunities for ultra-thin reconfigurable metalenses, in particular silicon based ones. In this work, we report a proof-of-concept design of an ultrathin (300 nm thick) and thermo-optically reconfigurable silicon metalens operating in the visible regime (632 nm). Importantly, we demonstrate that, using thermo-optical effects, it is possible to achieve continuous modulation of the focal-length at a fixed wavelength. In particular, operating under right-circularly polarized light, our metalens exhibits a linear focal shift from 165 mu m at 20 degrees C to 135 mu m at 260 degrees C, exceeding the lens focal depth. The average conversion efficiency of the lens is 26%, close to mechanically modulated devices, while its Strehl ratio is 0.99, confirming a diffraction-limited performance. Concurrently, in this work we report an automatized methodology to design a reconfigurable metalens, compute its layout and verify the expected performance. Overall, we envision that, by further optimization of the optical response of individual meta-atoms with machine-learning algorithms, thermally-reconfigurable silicon metalenses will emerge as a viable, chip-compatible soluti

关键词： Metasurface tunable lens varifocal metalens thermo-optic effect silicon nanofin resonator Pancharatnman-Berry geometric effect

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