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

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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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Including detector effects in the design of wide-field imaging systems

Including detector effects in the design of wide-field imagi...

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conference on current developments in lens design and optical engineering V

作者： Harvey, JE Atanassova, M Krywonos, A Univ Cent Florida CREOL Orlando FL 32826 USA

ISBN: (纸本)0819454613

Most imaging systems today include a mosaic detector array in the focal plane. optical designers of astronomical telescopes typically produce a design that yields a superb on-axis aerial image in the focal plane, and detector effects are included only in the analysis of the final system performance. Aplanatic optical designs (corrected for spherical aberration and coma) are widely considered to be superior to non-aplanatic designs. However, there is little merit in an aplanatic design for wide-field applications because one needs to optimize some field-weighted-average measure of resolution over the desired operational field-of-view (OFOV). Furthermore, when used with a mosaic detector array in the focal plane, detector effects eliminate the advantage of the aplanatic design even at small field angles. For wide fields-of-view, the focal plane is frequently despaced to balance field curvature with defocus thus obtaining better overall performance. We will demonstrate that including detector effects in the design process results in a different optimal (non-aplanatic) design for each OFOV that is even superior to an optimally despaced aplanatic design.

关键词： detector effects wide-field imaging systems grazing incidence X-ray telescopes

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Assessment, optimization, and tolerancing methods for visual instruments

Assessment, optimization, and tolerancing methods for visual...

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conference on current developments in lens design and optical Systems engineering

作者： Deslis, A Mouroulis, P Davidson Optron Inc W Covina CA 91790 USA

ISBN: (纸本)0819437387

A strategy for optimizing both the on-axis and the off-axis performance of coherently (directly) coupled visual instruments is presented. The strategy draws on the recently published body of data regarding the influence of various individual Seidel aberration and aberration combinations on subjective contrast sensitivity and resolution tasks, as well as studies on the correlation between subjective image quality and objective instrumental figures of merit. An MTF-based metric allows both optimization and tolerancing to be performed in a coherent manner that is based on experimental results of the effects of aberrations.

关键词： optimization visual systems optical design tolerancing MTF

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The design of microscopic system using zoom structure with a fixed magnification and the independency on the variation of object distance

The design of microscopic system using zoom structure with a...

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conference on current developments in lens design and optical engineering V

作者： Ryu, JM Jo, JH Jung, JH Chun, YS Kang, GM Hannam Univ Sch Nat Sci Taejon 306791 South Korea

ISBN: (纸本)0819454613

The multi-configurative microscopic system for inspecting the wire-bonding of reed frame is designed. Object rays is nearly collimated by a objective lens group which is a common lens group of x2 and x6 imaging lens systems and is splitted by two beam-splitters composed of a penta-prism and a refracting prism. And object rays started from the central region and the boundary region(reed frame region) on semiconductor chip(that is, the object) are imaged at the two different imaging planes by x2 and x6 imaging lens groups, respectively. The x6 imaging lens system with a constant object distance and a constant magnification is well designed by general imaging optics system design method. However, since the depth of wire structure on the reed frame has about +/-3 mm, in order to observe by a constant magnification and at a fixed imaging plane without the dependency on the variation of objective distance generated by the depth of wire structure on the reed frame, the imaging lens system is composed of two separated groups, which should be moved along nonlinear locus like mechanically compensated zoom lenses. The nonlinear equations for zoom locus are derived by using the Gaussian bracket. Refraction powers and positions of each groups are numerically determined by solving the equations, and initial design data for each groups is obtained by using Seidel third order aberration theory. The optimization technique is finally utilized to obtain this multi-configurative microscopic system.

关键词： lens design equivalent lens imaging system microscopic system multi-configurative system

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optical performance as a function of phosphor particle number in white LED

Optical performance as a function of phosphor particle numbe...

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conference on current developments in lens design and optical engineering XI - and Advances in Thin Film Coatings VI

作者： Chen, Cheng-Chien Chen, Ching-Yi Chien, Wei-Ting Yang, Tsung-Hsun Sun, Ching-Cherng Natl Cent Univ Inst Lighting & Display Sci Dept Opt & Photon Chungli 320 Taiwan

ISBN: (纸本)9780819482822

In this paper, we demonstrate a method to calculate the phosphor particle numbers and study the relationship among phosphor particle numbers, light output and correlated color temperature (CCT) of LEDs under remote package type and dispensing package type. We also discuss the influence of the thickness and concentration of phosphors on the performance of LEDs. We compare the various thicknesses and concentrations to check the resultant CCT and the output flux, where we can see that the lumen output is almost equal as the phosphor particle numbers is similar with the CCT at 6500 +/- 200 and 5000 +/- 100 K under the remote package type.

关键词： Particle number CCT Phosphor

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Effects and prediction of stray light produced by diffractive lenses

Effects and prediction of stray light produced by diffractiv...

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8th conference on current developments in optical design and optical engineering

作者： Thibault, S Renaud, N Wang, M INO Opt Engn Grp St Foy PQ G1P 4N8 Canada

ISBN: (纸本)0819432652

Correlation between computational models and corresponding experimental data of stray light produced by unwanted diffraction orders of diffractive lenses is described. It is shown that the attractive scaler model under Fresnel approximation does not agree with experimental data. The validity of Fresnel approximation for multi-order focusing optics is derived to explain the limitation of the scaler approach. Geometrical models with both coherent and incoherent summation of each diffractive orders coupled with efficiency estimation is used with success. The model takes into account the local diffraction efficiency and also of the number of diffractive orders supported locally by the structure. This geometrical optics model can be used in standard optical design software. Therefore it may be recommended as an additional tool for stray light analysis at the design stage of hybrid refractive/diffractive optical systems. In a second part, the impact of unwanted diffraction orders when diffractive optics is used in visible imaging systems is discussed. Several experimental observations about the use of plastic refractive/diffractive lens in relation to different fabrication process used to build the lens are also discussed. From those observations, we recommend an approach to reduce the stray light produced by the diffractive lens. In conclusion, a serious stray light analysis is mandatory in the design of visible imaging systems using diffractive lenses.

关键词： stray light diffractive optical element imaging optical design

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Diffraction and geometrical optical transfer functions: calculation time comparison 18

Diffraction and geometrical optical transfer functions: calc...

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conference on current developments in lens design and optical engineering XViii

作者： Antonio Diaz, Jose Mahajan, Virendra N. Univ Granada Dept Opt E-18071 Granada Spain Univ Arizona Coll Opt Sci Tucson AZ 85721 USA

ISBN: (纸本)9781510612082;9781510612075

In a recent paper, we compared the diffraction and geometrical optical transfer functions (OTFs) of an optical imaging system, and showed that the GOTF approximates the DOTF within 10% when a primary aberration is about two waves or larger [Appl. Opt., 55, 3241-3250 (2016)]. In this paper, we determine and compare the times to calculate the DOTF by autocorrelation or digital autocorrelation of the pupil function, and by a Fourier transform (FT) of the point-spread function (PSF);and the GOTF by a FT of the geometrical PSF and its approximation, the spot diagram. Our starting point for calculating the DOTF is the wave aberrations of the system in its pupil plane, and the ray aberrations in the image plane for the GOTF. The numerical results for primary aberrations and a typical imaging system show that the direct integrations are slow, but the calculation of the DOTF by a FT of the PSF is generally faster than the GOTF calculation by a FT of the spot diagram.

关键词： optical transfer function aberrations geometrical OTF diffraction OTF imaging

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Silicon Metalens toward a fully Silicon integrated SWIR sensing 25

Silicon Metalens toward a fully Silicon integrated SWIR sens...

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conference on current developments in lens design and optical engineering XXV

作者： Dupre, Matthieu Ma, Jian Hseih, Biay-cheng Goma, Sergio Qualcomm Technol Inc 5775 Morehouse Dr San Diego CA 92121 USA

ISBN: (纸本)9781510679221;9781510679238

Most Silicon based depth and lidar sensors rely on near-infrared (NIR 750-900nm) sources to produce depth images as Silicon CMOS sensors can achieve a high quantum efficiency for an unbeatable cost at such wavelengths. Advances in short wave infrared (SWIR) sensor technologies, such as Silicon-Germanium sensors, changes this paradigm and opens a new window for groundbreaking sensor designs, as SWIR can push the wavelength above retinal hazard area (>1400nm), allowing for much higher eye safety, due to the low penetration of those wavelengths through the eye lens. Here, we propose to use a Silicon Metalens flat optics and build upon our stacked sensor technologies to obtain a fully Silicon integrated stacked sensor at SWIR wavelengths. We will discuss the design of the stacked sensor and focus on the Silicon Metalens for multiple use-cases. We will demonstrate the results of our Silicon metalens prototype at 1550nm. We will show numerical simulations of the optical stack for eye-tracking application or wide-angle time of flight (TOF) and discuss the necessary trade-offs.

关键词： metalens ToF sensors XR optics lens design

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PROPAGATION METHODS FOR THE ANALYSIS OF BISTABLE DEVICES AND SPATIAL LIGHT MODULATORS BASED ON NONLINEAR MOLECULAR MEDIA

PROPAGATION METHODS FOR THE ANALYSIS OF BISTABLE DEVICES AND...

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conference on current developments in optical design and optical engineering iii

作者： SPEISER, S GROSWASSER, D ORENSTEIN, M TECHNION ISRAEL INST TECHNOL DEPT CHEMIL-32000 HAIFAISRAEL

ISBN: (纸本)081941249X

We already discussed the bistable behavior of a Fabry Perot resonator filled with molecular media as well as the characteristics of a spatial light modulator (SLM) based on the nonlinearity induced by excited state absorption. In the present paper we present two practical configurations. First we analyze a cavity-less bistable element which removes some of the realization problems related to high finess cavity. In this configuration the nonlinear medium is located in one arm of an optical interferometer. The scheme provides the required amount of positive feedback by the bistable mechanism -- but without a cavity. We applied the nonlinear eikonal approximation, a method which takes care of the detailed propagation effects, and obtained conditions for bistability, as well as optimizing the design parameters such as the output mirror reflectivity, etc.

关键词： optical fibers Nonlinear optics Spatial light modulators Bistability Interferometers Mirrors Absorption Reflectivity Beam propagation method Resonators

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Accelerating diffractive optics design with GPU-based parallel technique

Accelerating diffractive optics design with GPU-based parall...

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conference on current developments in lens design and optical engineering XI - and Advances in Thin Film Coatings VI

作者： Liu, Kan Li, Hui Zhang, Xinyu Li, Dehua Wei, Mingyue Li, Bin Xie, ChangSheng Zhang, Tianxu Huazhong Univ Sci & Technol Inst Pattern Recognit & Artificial Intelligence State Key Lab Multispectral Informat Proc Technol Wuhan 430074 Hubei Peoples R China Wuhan Natl Lab Optoelect Wuhan 430074 Peoples R China

ISBN: (纸本)9780819482822

In this paper GPU based data parallel technique is used to reduce calculating time in diffractive optics elements (DOE) design. By using compute unified device architecture (CUDA) framework, comparison of acceleration radio of some major methods using in DOE design, including Gerchberg Saxton algorithm for global optimization in conjunction with Rayleigh-Sommerfeld diffractive integrating transformation, genetic algorithm with a finite-difference time-domain method and simulated annealing algorithm, is made with demonstrational DOE-lens design, whose focal spot size is 0.5 mu m, incident light wavelength is 650 nm, focal length is 3mm, DOE aperture size is 2mm.

关键词： DOE design GPU acceleration CUDA Algorithm comparison

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