New secondary axial color aberration theory has enabled powerful tools in the analysis of opticalsystems. Using these tools, design principles of a microscope objective operating over visible wavelengths are explored...
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Unsupervised deep learning has only been used in rotationally symmetric opticaldesign. This work presents a differentiable three-dimensional ray tracing module and related loss functions, enabling unsupervised learni...
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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 ...
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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 opticaldesigner can significantly simplify opticalsystems 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 opticaldesign using a flat image sensor. We discuss the various benefits in terms of optical performance and Z-stack reduction.
We present the design of an integrated 2-dimensional (2D) microlens array with a high-speed 2D-PD array to mitigate the photocurrent distribution in the N × N photodetector array for free space optical communicat...
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In this study, numerical simulation and analysis of leakage signal characteristics of gas pipelines with different leakage holes were carried out based on Fluent software. It was found that the differences in leakage ...
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In this paper, the drive motor, main deceleration ratio, tire and power battery of an electric vehicle are matched and calculated, and the parameters of the main components of the powertrain are *** order to improve t...
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opticalsystems with prisms, decentered elements or complex, assembled groups require accurate optical models to perform the tolerancing. Built-in, standard tolerancing methods often limit the analysis possibilities. ...
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The rapid advancement of science and technology has underscored the significant potential of intelligent driving systems in the fields of robotics and automotive industries. We focus on the design and implementation o...
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Conventional semiconductors, e.g., Si and GaAs with tetrahedral coordination (four-fold) structures, possess good stability but relatively low optical absorption compared with halide perovskites with octahedral coordi...
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Conventional semiconductors, e.g., Si and GaAs with tetrahedral coordination (four-fold) structures, possess good stability but relatively low optical absorption compared with halide perovskites with octahedral coordination (six-fold) structures, which exhibit superior optical absorption but relatively poor stability. It is thus desirable to combine the complementary properties of four-fold and six-fold semiconductors to have a system with both good stability and optical absorption. To achieve such a goal, we investigate the spinel compounds AB(2)X(4) (X = O, S and Se) as potential candidates because they possess both four-fold and six-fold coordination in one structure. Here, we built four basic structure units as material genes to design various types of spinel compounds with optimal optical absorption. The optical absorption of a semiconductor (alpha) is fundamentally determined by the dipole transition matrix element (|M|(2)) and joint density of states (J(cv)). Our first-principles calculations show that in AB(2)X(4) systems the type of cation at the B site determines the optical absorption. Two rules are identified through our study: (i) the s(v) cations with the valence s orbital at the valence band maximum at the B site (type-I, type-ii) will lead to allowed transitions, whereas the s(c) cations with the valence s orbital at the conduction band minimum at the B site (type-iiI, type-IV) will lead to partially forbidden or fully forbidden transitions;(ii) when the s(v) cation is located at the B site, the A site with the s(c) cations (type-I) has higher |M|(2), while the A site with the s(v) cations (type-ii) has higher J(cv). Our study, therefore, provides guidelines to optimize the J(cv) and |M|(2), and thus alpha, through cation engineering in AB(2)X(4) compounds, which have higher stability compared to that of halide perovskites.
The abbe number of diffractive optical element is negative, which is opposite to that of traditional refraction optical element. So diffractive optical element has unique advantages on achromatic and thermal compensat...
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