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检索条件"任意字段=Conference on Current Developments in Lens Design and Optical Systems Engineering"

共 530 条记录，以下是21-30 订阅

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Review on Advancements and Challenges in Terahertz optical Communication

Review on Advancements and Challenges in Terahertz Optical C...

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2024 International conference on Smart Electronics and Communication systems, ISENSE 2024

作者： Anujan, Titto Jose, Tony Vijayan, Vismaya Karunya Institute of Technology and Sciences Division of ECE Tamil Nadu Coimbatore641114 India College of Engineering Trivandrum Department of Electronics and Communication Engineering Kerala 695016 India

ISBN: (纸本)9798331528126

The frequency range of terahertz (THz) has shown great promise for optical communication due to its enormous bandwidth and low interference. This review paper provides a thorough analysis of the latest developments and current obstacles in THz optical *** microwave and infrared wavelengths, the terahertz (THz) frequency range has special possibilities for optical communication *** investigates how THz frequencies and optical communication are convergent, emphasising the latter's promise for high-bandwidth, low-latency data transfer. We investigate possible uses of THz optical communication, such as sensing, imaging, and wireless networks, highlighting the revolutionary influence of this new sector on the design of communication systems in the future. © 2024 IEEE.

关键词： Bandwidth

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Latest advancements at NILT on flat metalens-based camera modules in near-infrared 23

Latest advancements at NILT on flat metalens-based camera mo...

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conference on current developments in lens design and optical engineering XXIII Part of SPIE Optics and Photonics conference

作者： Mattinson, Fredrik Quaade, Ulrich Johansen, Villads Egede Samadi, Akbar Fly, Jesper Schmidlin, Moritz NIL Technol ApS Haldor Topsoes Alle 1 DK-2800 Lyngby Denmark

ISBN: (纸本)9781510654198;9781510654181

NIL Technology (NILT) is an optical solutions company designing, developing, and manufacturing flat optical elements and components with nanoscale features such as diffractive optical elements (DOEs) and meta optical elements (MOEs). NILT's MOE lenses have recently demonstrated a groundbreaking 94% absolute efficiency at 940 nm. This major milestone, in combination with other efforts such as the subsequent module integration and enabling of mass production of MOE elements, are among the key development areas for successful adoption of MOE lenses in various markets, ranging from consumer to automotive and applications such as sensing and machine vision systems. Here, we report our recent achievements with a camera module based on an MOE lens. We have successfully designed and manufactured camera modules using a single MOE lens showing excellent performance compared to refractive lens counterparts. The design has a low f-number and extremely high relative illumination. Prototypes are prepared using e-beam lithography, whereas MOE lenses in mass production are manufactured using nanoimprint lithography. The characterization of the MOE lenses reveals full agreement with the simulated nominal design. Image artifacts can appear due to higher orders of diffraction if the MOE lenses are not designed and manufactured properly. To illustrate the promise for volume production, a tolerance analysis has been performed, where the system tolerance analysis shows yield versus performance. At the module level, a straylight study, including ghost image and finally, thermal stability has been analyzed. The tolerance and thermal analysis are not presented in this manuscript. These results show the advantages of using 'NILT's high-efficiency meta optical elements compared to traditional optical systems.

关键词： metalens metasurface diffractive lens DOE MOE diffraction efficiency meta-atom

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design of projection-based augmented reality system using holographic screen display 23

Design of projection-based augmented reality system using ho...

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conference on current developments in lens design and optical engineering XXIII Part of SPIE Optics and Photonics conference

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

ISBN: (纸本)9781510654198;9781510654181

Holographic display elements (HOEs) with a high diffraction efficiency and size enlargement have been developed since 2019. To achieve high brightness and low haze, unprecedented optical systems have been proposed with a uniform chief ray angle of 0 degrees in the x-section and 70 degrees in the y-section of the HOEs. A 360 degrees cylindrical holographic screen display (CHSD) was obtained by providing a large tilt to the surface shape near the optical axis. This was done using a first-order odd aspherical coefficient for the light flux from a refractive optical system (RO). A flat holographic screen display (FHSD) is a compact, high-performance display that uses three decentered and tilted freeform mirrors to route light flux from the RO in a ball-like form. Prototyping also proposes the possibility of an augmented reality system that takes advantage of the high transparency. The design for further miniaturization while maintaining optical performance was also discussed, in which the size of the first mirror was reduced by reducing the half-field angle of the RO to approximately 6 degrees. Furthermore, by increasing the negative power of the second mirror, the small size could be maintained The size of the last mirror was dependent on the screen size and could not be reduced. By laying down the posture of this mirror, we were able to halve the size reduction in the vertical direction. In this paper, lens designs for CHSDs and FHSDs are reported. The potential of this display is also discussed.

关键词： Holographic optical elements augmented reality display freeform mirror projection lens lens design

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Convolutional Neuronal Network to restore images encoded by a wavefront coding imaging system 14

Convolutional Neuronal Network to restore images encoded by ...

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current developments in lens design and optical engineering XXIV 2023

作者： Reyes-Alfaro, José M. Toxqui-Quitl, Carina Espejel-Rivera, María A. González-Amador, Enrique Padilla-Vivanco, Alfonso Computer Vision Laboratory Universidad Politécnica de Tulancingo Ingenierías 100 Huapalcalco Hidalgo43629 Mexico

ISBN: (纸本)9781510665460

Wavefront coding (WFC) technique has been used to extend the depth of field (DoF) in an imaging system. Its effectiveness lies in using a phase mask (PM), which allows the point spread function (PSF) to remain almost invariant in an axial range of the DoF. Subsequently, a restoration method of the acquired coded images is required. An optical-computational technique that uses Trefoil profile PM for encoding and a convolutional neural network (CNN) to restore is presented. Comparative results are done between the restored image using the Wiener filter and the one obtained with a CNN. An image quality evaluation is done in terms of spatial resolution and contrast. © 2023 SPIE.

关键词： Imaging systems

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A Toolkit for Multiscale optical System Inverse-design 23

A Toolkit for Multiscale Optical System Inverse-Design

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conference on current developments in lens design and optical engineering XXIII Part of SPIE Optics and Photonics conference

作者： Campbell, Sawyer D. Jenkins, Ronald P. Zerbe, Benjamin A. Whiting, Eric B. Balasubramanian, Manushanker Das, Arkaprovo Young, Jacob T. Werner, Douglas H. Werner, Pingjuan L. Penn State Univ Sch Elect Engn & Comp Sci University Pk PA 16802 USA

ISBN: (纸本)9781510654198;9781510654181

optical system design is undergoing a transformational change with the increases in computational horsepower, cutting-edge algorithmic developments, and the advent of new nanofabrication technologies. Among the most exciting advances in recent memory are optical metasurfaces, which are patterned surfaces commonly realized through nanofabrication that can imbue optical engineers with expanded degrees of design freedom due to their ability to exploit the generalized form of Snell's law. Through intelligent optimization and design, metasurfaces can be constructed which achieve arbitrary chromatic dispersion behaviors and unprecedented control over polarization that simply cannot be realized with conventional optical elements. However, designing high-performance metasurfaces requires the use of full-wave simulation tools and numerical optimization techniques which necessitate considerable computational resources. Moreover, while optical metasurfaces are moving towards millimeter and centimeter scale diameter lenses with advances in nanofabrication techniques, it is computationally infeasible to employ full-wave simulation tools directly to model optical systems that use such large size elements. Nevertheless, the size, weight, and power (SWaP) advantages afforded by optical metasurfaces make them a compelling choice for designers to consider in a number of applications, which are currently limited by bulky conventional optical solutions. Therefore, techniques that can rapidly model metasurfaces in conjunction with conventional optical elements such as lenses, mirrors, and prisms are highly desirable. In this presentation, we highlight a toolkit of custom solvers, design procedures, and powerful optimization algorithms that simplify and accelerate the development of hybrid optical systems with arbitrary combinations of conventional and metasurface elements.

关键词： optical design optimization inverse-design gradient-index lenses metasurfaces simulation multiscale

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Curved CMOS image sensors for enhanced imaging systems: focus on smartphone camera lens 10

Curved CMOS image sensors for enhanced imaging systems: focu...

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conference on Photonic Instrumentation engineering X

作者： Jahn, Wilfried Mehri, Tahar SILINA 880 Route Mimet Gardanne France

ISBN: (纸本)9781510659612;9781510659629

Curved imaging sensors bring significant size, weight and cost reduction to imaging systems while mitigating off-axis optical aberrations, as opposed to current flat sensors. Unlocking these key features has captured the interest of major players over the last two decades. SILINA has been developing a CMOS Image Sensor (CIS) curving process, which adapts to various sensor characteristics. This enables to maximize the optical performance of every single imaging system. We have demonstrated the manufacturing of curved CMOS Front-Side Illuminated (FSI) and Back Side Illuminated (BSI), opening a new area of compact, fast, wide-angle and high-resolution optical lenses. This new degree of freedom offered to optical designer can significantly simplify optical systems through a significant improvement of the optical performance while simplifying the system architecture in many different ways. The field of view (FOV), the contrast, the aperture can be increased while optical aberrations can be minimized. At the end, the different costs related to manufacturing, metrology, integration, and alignment are reduced. This is of great importance for applications requiring compact and high resolution lens, notably in low-light environment. To quantify the gain brought by curved image sensor for smartphone camera lens, we are performing several comparative optical lens designs. We compare traditional flat-image sensor based camera lens to camera lens optimized specifically with a curved image sensor. In this paper, we present the result obtained on wide-angle smartphone camera lens design considering a spherical concave image sensor. We compare the optical characteristics and performance with a reference optical design using a flat image sensor. We discuss the various benefits in terms of optical performance and Z-stack reduction.

关键词： Curved CMOS Image Sensor optical design Smartphone Camera lens

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Passive athermalization of MWIR optical designs utilizing different infrared optical materials 23

Passive athermalization of MWIR optical designs utilizing di...

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conference on current developments in lens design and optical engineering XXIII Part of SPIE Optics and Photonics conference

作者： Kucukcelebi, Doruk Aydemir, Sukru Emre Roketsan Kemalpasa Mahallesi Sehit Yuzbasi Adem Kutlu Soka TR-06780 Ankara Turkey

ISBN: (纸本)9781510654198;9781510654181

In this paper, different optical designs, which are composed of different MWIR optical materials, are utilized for passive athermalization and their performance in athermalization are analyzed. The optical designs are carried out by preserving the athermal property as well as keeping the image quality at higher levels within the working temperature between -40 degrees C and +60 degrees C. The passive athermalization process begins with the calculation of athermalization conditions of candidate material properties. By considering these conditions, athermal material pairs are chosen. To reduce optical aberrations, aspherical surfaces are utilized during the optimization process. At the end of the design phase, the performance of different configurations of athermal optical material pairs, which are enclosed by aluminum alloy housing material, are presented.

关键词： Athermalization infrared optical design optical material pair Mid Wave Infrared (MWIR)

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Accurate camera performance prediction using optical and imaging simulation pipeline for super wide-angle lens 23

Accurate camera performance prediction using optical and ima...

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conference on current developments in lens design and optical engineering XXIII Part of SPIE Optics and Photonics conference

作者： Buquet, J. Larouche, R. Parent, J. Roulet, P. Thibault, S. Immervision 2020 Blvd Robert Bourassa Montreal PQ H3A 2A5 Canada

ISBN: (纸本)9781510654198;9781510654181

optical design process consists in minimizing aberrations using optimization methods. It relies on key performance indicators (KPIs), such as point spread function (PSF), Modulated transfer function (MTF), or relative illumination (RI) and spot sizes, that depend on lens elements aberrations. Their target values need to be defined -either for human or machine perception- at early stage of the design, which can be complex to do for challenging designs such as extended field of view. We developed an optical and imaging simulation pipeline able to render the effects of complex optical designs and image sensor on an initial aberration-free image. Extracting files from ray tracing software for simulating the PSF and sensor target information, the algorithm accurately renders off-axis aberrations with Zernike polynomials representation combined with noise contribution and relative illumination. The obtained image faithfully represents an optical system performance from the optics to the sensor component and we can then study the impact of additional aberration introduction.

关键词： End-to-End design spatially varying PSF wide angle image simulation

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Generative design and Digital Manufacturing: Using AI and robots to build lightweight instruments 23

Generative Design and Digital Manufacturing: Using AI and ro...

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conference on current developments in lens design and optical engineering XXIII Part of SPIE Optics and Photonics conference

作者： McClelland, Ryan NASA Goddard Space Flight Ctr Greenbelt MD 20770 USA

ISBN: (纸本)9781510654198;9781510654181

Digital engineering technologies are transforming long-stagnant development processes by applying the tremendous advancements in Information Technology (IT) to classical engineering tasks such as design, analysis, and fabrication of space-flight instrument structures. Generative design leverages developments in Artificial Intelligence (AI) and Cloud computing to enable a paradigm shift in the design process, allowing the engineer to focus on defining the requirements and objectives of the design while AI generates optimized designs which comply with the input requirements. Digital Manufacturing allows these complex lightweight designs to be efficiently manufactured by directly fabricating from the resulting 3D models. The development of these two Digital engineering technologies realizes significant mass savings while simultaneously reducing structure development time from months to days. This paper describes the development of the Evolved Structures process applying these technologies to spaceflight optical instrument structures including an example demonstrating greater than 10x reduction in development time/cost and greater than 3x improvement in structural performance.

关键词： Generative design Digital Manufacturing Topology Optimization Evolved Structures AI

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optical design process of a human eye inspired lens 23

Optical design process of a human eye inspired lens

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conference on current developments in lens design and optical engineering XXIII Part of SPIE Optics and Photonics conference

作者： Allain, Guillaume Thibault, Simon Univ Laval Fac Sci & Genie Dept Phys Genie Phys & Opt 1045 Ave Med Laval PQ G1V 0A6 Canada COPL 2375 Rue Terrasse Quebec City PQ G1V 0A6 Canada

ISBN: (纸本)9781510654198;9781510654181

Bio-inspired optical design can be described as a conscious decision in the design process to take inspiration from physical adaptation that were brought up by natural selection. The usual goal is to introduce non-conventional techniques or material in order to achieve better performance or novel applications. However, when the target is to imitate closely the form-factor, appearance and optical properties of a biological system, new requirements are added to the design process and new problems arises. In this paper, we will expose the design of an optical system that draws most requirements from both the optical properties and the form-factor of the human eye. However, contrary to human eye models, the main requirements for this project is to make a realistic design which can be assembled as a prototype. The design process will be laid out, by firstly introducing system requirements and various performance targets that comes from the bio-inspired design. The constraints associated with using entrance pupil's appearance as a requirement will be presented. This paper will also specifically be looking at distortion as a solution for modulating resolution throughout the field of view and as a tool to aid in those novel problems.

关键词： optical design Bio-inspired design Human eye optical design methodology optical Distortion

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