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lens design and system optimization for foveated imaging

Lens design and system optimization for foveated imaging

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conference on current developments in lens design and optical engineering IX

作者： Curatu, George Harvey, James E. LightPath Technol 2603 Challenger Tech Ct Orlando FL 32826 USA Univ Cent Florida Orlando FL 32816 USA

ISBN: (纸本)9780819472809

Foveated imaging addresses the need for compact wide-angle imagers capable of high-resolution and compressed data transmission. The principle behind foveated imaging is to cover a wide field-of-view (FOV) with a relatively simple and compact low-resolution lens, and use a liquid crystal spatial light modulator (SLM) to correct wavefront aberrations at any selected field point. The SLM correction provides a high-resolution fovea that can be actively moved anywhere within the FOV. While most research has focused so far mainly on SLM performance, the general trend being to increase SLM resolution and modulation depth, the actual lens design and system optimization aspects were often neglected. In this paper, we propose a wide-angle lens design intended for foveated imaging applications, and discuss typical tradeoffs. Taking this design as an example, we present a method to estimate the smallest SLM resolution required to correct the wavefront error effectively, showing that with the appropriate design, this resolution can be reduced up to 10 times compared to current designs. Increasing the SLM resolution beyond this point and increasing the modulation depth above one wavelength is not necessary, and will actually reduce the performance of the imaging system. We also demonstrate the importance of fabrication tolerances, and we propose a method to calibrate the SLM in order to cancel out all additional wavefront aberrations introduced by fabrication and assembly errors.

关键词： foveated imaging adaptive optics wide-angle lenses aberration compensation spatial light modulators liquid crystal devices

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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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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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Efficient 3M PBS Enhancing Miniature Projection Optics 17

Efficient 3M PBS Enhancing Miniature Projection Optics

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conference on current developments in lens design and optical engineering Xvii

作者： Yun, Zhisheng Nevitt, Timothy Willett, Stephen Mortenson, Dave Le, John McDowell, Erin Kent, Susan Wong, Timothy Beniot, Gilles J. Ouderkirk, Andrew 3M Co Elect Mat Solut Div St Paul MN 55144 USA 3M Co Elect & Energy Grp Lab St Paul MN 55144 USA

ISBN: (数字)9781510602861

ISBN: (纸本)9781510602854;9781510602861

Over the past decade, 3M has developed a number of mobile projectors, with a goal towards providing the world's smallest, most efficient projection systems. Compact size and efficiency are required characteristics for projection systems used in mobile devices and more lately, in augmented reality systems. In this paper we summarize the main generations of 3M light engine optical designs. We present the optical architectures of four light engines, including the rationale behind the illumination designs and the projection systems. In particular, we describe various configurations relating to the 3M polarizing beam splitter (PBS) which is key to enhanced efficiency of the miniature projection systems.

关键词： Augmented reality (AR) Head Mounted Display Polarizing beam splitter (PBS) Projection system design Pico projector Illumination system design Projection lens

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Liquid crystal lens focusing in monocentric multiscale imagers

Liquid crystal lens focusing in monocentric multiscale image...

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conference on current developments in lens design and optical engineering XIII

作者： Stamenov, Igor Tremblay, Eric Baker, Katherine A. McLaughlin, Paul Ford, Joseph E. Univ Calif San Diego Dept Elect & Comp Engn La Jolla CA 92093 USA

ISBN: (纸本)9780819492036

In multiscale imagers a single objective lens is shared by multiple secondary optical systems, so that a high-resolution wide-angle image is acquired in overlapping fields sensed by multiple conventional focal planes. In the "AWARE2" 2 Gigapixel imager, F/2.4 optics cover a 120 degree field of view using a monocentric glass primary lens shared by 221 molded plastic subimagers, each with a 14 Megapixel focal plane. Such imagers can independently focus parts of the image field, allowing wide-angle imaging over relatively close and deep image fields. However, providing hundreds of independent mechanical focus adjustments has a significant system impact in terms of complexity, bulk, and cost. In this paper we explore the use of an electronically controlled liquid crystal lens for focus of multiscale imagers in general, and demonstrate use with the AWARE2 imager optics. The lens Vector Auto Focus (LVAF) liquid crystal lens provides up to 5 diopters of optical power over a 2.2mm aperture diameter, the maximum currently available aperture. However, a custom lens using the same materials and basic structure can provide the 5 diopters power and 6.4 mm aperture required to obtain full resolution overlapping image fields in the AWARE2 imager. We characterize the LVAF lens and the optical performance of the LVAF lens in the current AWARE2 prototype, comparing the measured and optically modeled resolution, and demonstrating software control of focus from infinity to an 2m object distance.

关键词： Monocentric imager liquid crystal lens Gigapixel focusing mechanism LC focus Multiscale monocentric wide field panoramic

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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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Micro-optical elements for optical wireless applications

Micro-optical elements for optical wireless applications

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conference on current developments in lens design and optical engineering XIV

作者： Jin, Xian Guerrero, Daniel Klukas, Richard Holzman, Jonathan F. Univ British Columbia Sch Engn Integrated Opt Lab Kelowna BC V1V 1V7 Canada Univ British Columbia Sch Engn Posit & Navigat Signal Proc Lab Kelowna BC V1V 1V7 Canada

ISBN: (纸本)9780819496911

Customized high-contact-angle microlenses are presented for optical wireless communication (OWC) and optical wireless location (OWL) applications. These microlenses are fabricated by way of an electro-dispensing technique to establish wide field-of-views (FOVs). Each microlens is formed from dispensed UV-curable polymer with pressure-control defining the microlens volume and a voltage on the metal needle tip defining the microlens shape (by way of electrowetting). UV curing is then applied. Microlenses with FOVs up to 90 degrees are fabricated for high-density integration above a CMOS imaging sensor for wide-FOV operation in emerging OWC and OWL applications. Both theoretical ray-tracing analyses and experimental imaging results are presented with good agreement.

关键词： electro-dispensing field-of-view imaging sensor microlens optical wireless numerical aperture

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optical Modeling with Precise Spatial-chromatic Light Distribution in Phosphor-converted White LEDs 16

Optical Modeling with Precise Spatial-chromatic Light Distri...

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conference on current developments in lens design and optical engineering XVI

作者： Sun, Ching-Cherng Chang, Yu-Yu Wang, Yu-Huan Chen, Ching-Yi Lo, Yi-Chien Cheng, Han-Hsiang Natl Cent Univ Dept Opt & Photon Chungli 320 Taiwan Natl Cent Univ Inst Lighting & Display Chungli 320 Taiwan

ISBN: (纸本)9781628417449

White light LEDs become more and more important in display and lighting in various structures. Here a new modeling algorithm for phosphor-converted white light-emitting diodes (pcW-LEDs) is proposed, aiming to perform accurate simulation for color appearance, where potentially enabling optical designers to remove yellowish/bluish spots in LED lighting. The proposed modeling method is applied to simulate a pcW-LED with a hemi spherical lens. The simulation accurately predicts the blue and yellow light distribution. The model is further verified by applying a total internal reflector lens to the pcW-LED. In the midfield region, the blue and yellow light distribution exhibit large variations as the observation distance changed;this varying light pattern for both the blue and yellow lights can be accurately predicted by using the proposed model. The well-established optical model should facilitate designing a pcW-LED that features high-quality illumination and enhances color uniformity.

关键词： packaging efficiency luminous efficacy white LED phosphor converted

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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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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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