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11th Conference on Novel Optical Systems Design and Optimization

作者： Chang, Chir-Weei Chen, Yung-Lin Ind Technol Res Inst Elect & Optoelect Res Labs Hsinchu 310 Taiwan

ISBN: (纸本)9780819472816

A novel design of a wavefront coded compact camera system with liquid lens is presented. The point spread function must remain practically constant over a wide range of defocus in order to create an image which is sharp over a large depth of field. Therefore, the trade-off between the effect of extended depth of field and reduction in the signal to noise ratio of the restored image become critical. By combining liquid lens and wavefront coding, the system can deliver much greater depth of field without the restoration problems caused by the similarity of point spread function. This could improve the overall image performance.

关键词： wavefront coding liquid lens extended depth of field

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Dual Band Computational Infrared Spectroscopy via Large Aperture Meta-Optics

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ACS PHOTONICS 2023年第4期10卷 986-992页

作者： Froch, Johannes E. Colburn, Shane Zhan, Alan Han, Zheyi Fang, Zhuoran Saxena, Abhi Huang, Luocheng Bohringer, Karl F. Majumdar, Arka Univ Washington Dept Phys Seattle WA 98195 USA Univ Washington Dept Elect & Comp Engn Seattle WA 98195 USA Tunoptix Seattle WA 98195 USA Univ Washington Dept Bioengn Seattle WA 98195 USA Univ Washington Inst Nanoengn Syst Seattle WA 98195 USA

An important challenge in contemporary photonics research is the miniaturization of optical components and devices to facilitate their deployment in more compact and energy-efficient mobile platforms. As spectrometers are one of the most essential tools for optical measurements, a particularly strong demand exists to find new concepts to replace commonly used spectrometers, which are typically bulky and therefore often impractical for mobile applications. Arrays of subwavelength scatterers, also known as meta-optics, engineered to shape and manipulate transmitted optical wavefronts provide a particularly appealing solution for this problem. Herein, the concept of a computational spectrometer is presented where strongly chromatic point spread functions of a high-efficiency double helix meta-optic are utilized in combination with a computational back end to accurately reconstruct optical spectra. This is demonstrated in two different infrared wavelength ranges (1260-1360 nm and 1480-1640 nm), while achieving a spectral resolution of & SIM;3.5 nm, underlining the potential of a small footprint meta-optical spectrometer.

关键词： dielectric metasurface computational spectrometer wavefront coding computational reconstruction spectrometer miniaturization

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Optimized square-root phase mask to generate defocus-invariant modulation transfer function in hybrid imaging systems

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OPTICAL ENGINEERING 2015年第3期54卷 1-7页

作者： Van Nhu Le Fan, Zhigang Nghia Pham Minh Chen, Shouqian Harbin Inst Technol Sch Astronaut Harbin 150001 Peoples R China Harbin Inst Technol Sch Elect & Informat Engn Harbin 150001 Peoples R China

wavefront coding involves the use of an asymmetrical phase mask to extend the depth of field of incoherent imaging systems. The performance of wavefront coding systems depends on designing a suitable phase profile to generate the defocus-invariant imaging characteristic. We proposed a square-root phase mask with two profile factors for achieving a steadier defocused modulation transfer function (MTF). Several evaluation methods are employed for the purpose of performance comparison between the proposed phase mask and the previously suggested phase masks under the constraint condition that the phase parameters are optimized at the same level of noise gain. Numerical results show that the square-root phase mask yields better properties in extended depth of field imaging, especially in acquiring defocus-invariant MTFs and eliminating image artifacts associated with the decoded images. (C) 2015 Society of Photo-Optical Instrumentation Engineers (SPIE)

关键词： extended depth of field wavefront coding phase mask modulation transfer function defocus

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Phase Only Pupil Filter Design Using Zernike Polynomials

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JOURNAL OF THE OPTICAL SOCIETY OF KOREA 2016年第1期20卷 101-106页

作者： Liu, Jiang Miao, Erlong Sui, Yongxin Yang, Huaijiang Chinese Acad Sci Changchun Inst Opt Fine Mech & Phys Engn Researcher Ctr Extreme Precis Opt Changchun 130033 Jilin Peoples R China Chinese Acad Sci Grad Univ Beijing 100049 Peoples R China

A pupil filter is a useful technique for modifying the light intensity distribution near the focus of an optical system to realize depth of field (DOF) extension and superresolution. In this paper, we proposed a new design of the phase only pupil filter by using Zernike polynomials. The effect of design parameters of the new filters on DOF extension and superresolution are discussed, such as defocus Strehl ratio (S.R.), superresolution factor (G) and relative first side lobe intensity (M). In comparison with the other two types of pupil filters, the proposed filter presents its advantages on controlling both the axial and radial light intensity distribution. Finally, defocused imaging simulations are carried out to further demonstrate the effectiveness and superiority of the proposed pupil filter on DOF extension and superresolution in an optical imaging system.

关键词： wavefront coding Non-integer phase mask Depth of field Imaging system

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Reducing complexity in computational imaging systems

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OPTICS EXPRESS 2003年第18期11卷 2102-2108页

作者： Kubala, K Dowski, E Cathey, WT CDM Opt Inc Boulder CO 80303 USA

Traditional methods of optical design trade optical system complexity for image quality. High quality imagers often require high system complexity. A new imaging methodology called wavefront coding uses aspheric optics and signal processing in order to reduce system complexity and deliver high quality imagery. An example in terms of a conformal IR imaging system is given. (C) 2003 Optical Society of America.

关键词： .aberration optical system Optimized high quality aspheric Imaging Systems wavefront coding optics and signal conformal IR

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Metasurface Generation of Paired Accelerating and Rotating Optical Beams for Passive Ranging and Scene Reconstruction

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ACS PHOTONICS 2020年第6期7卷 1529-1536页

作者： Colburn, Shane Majumdar, Arka Univ Washington Dept Elect & Comp Engn Seattle WA 98195 USA Univ Washington Dept Phys Seattle WA 98195 USA

Depth measurements are vital for many emerging technologies with applications in augmented reality, robotics, gesture detection, and facial recognition. These applications, however, demand compact and low-power systems beyond the capabilities of many state-of-the-art depth cameras. While active illumination techniques can enable precise scene reconstruction, they increase power consumption, and systems that employ stereo require extended form factors to separate viewpoints. Here, we exploit a single, spatially multiplexed aperture of nanoscatterers to demonstrate a solution that replicates the functionality of a high-performance depth camera typically comprising a spatial light modulator, polarizer, and multiple lenses. Using cylindrical nanoscatterers that can arbitrarily modify the phase of an incident wavefront, we passively encode two complementary optical responses to depth information in a scene. The designed optical metasurfaces simultaneously generate a focused accelerating beam and a focused rotating beam that exploit wavefront propagation-invariance to produce paired, adjacent images with a single camera snapshot. Compared to conventional depth from defocus methods, this technique enhances both the depth precision and depth of field at the same time. By decoding the captured data in software, our system produces a fully reconstructed image and transverse depth map, providing an optically passive ranging solution. In our reconstruction algorithm, we account for the field curvature of our metasurface by calculating the change in Gouy phase over the field of view, enabling a fractional ranging error of 1.7%. We demonstrate a precise, visible wavelength, and polarization-insensitive metasurface depth camera with a compact 2 mm(2) aperture.

关键词： computational imaging depth sensors metasurfaces extended depth of focus ranging wavefront coding

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Applications of Next Generation Optical Data Storage Technologies

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IEEE TRANSACTIONS ON MAGNETICS 2011年第3期47卷 669-678页

作者： Park, No-Cheol Park, Young-Pil Park, Kyoung-Su Yang, Hyunseok Yonsei Univ Ctr Infoat Storage Device Dept Mech Engn Seoul 120749 South Korea

In recent years, there have been many research studies focusing on next generation optical data storage technologies, such as near-field recording and holographic data storage systems. Many studies from several disciplines have been perfoed and merged to realize of the next generation optical data storage. The technologies that have been developed for optical data storage are also essential for the other research areas. These technologies can be widely applied to various fields, such as near-field optics-based microscopy, small-sized imaging systems, plasmonic nanolithography using a solid immersion lens (SIL) and a nanoscale aperture, and bio-applications. In this paper, the applications and concepts of the next generation of optical storage technologies are discussed.

关键词： Digital holography holographic microscopy near-field (NF) optics NF microscopy optical data storage optical image stabilization optical lithography voice coil actuator wavefront coding

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Optimized non-integer order phase mask to extend the depth of field of an imaging system

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OPTICS COMMUNICATIONS 2016年 374卷 92-96页

作者： Liu, Jiang Miao, Erlong Sui, Yongxin Yang, Huaijiang Chinese Acad Sci Changchun Inst Opt Fine Mech & Phys Engn Res Ctr Extreme Precis Opt Changchun 130033 Jilin Peoples R China Chinese Acad Sci Grad Univ Beijing 100049 Peoples R China

wavefront coding is an effective optical technique used to extend the depth of field for an incoherent imaging system. Through introducing an optimized phase mask to the pupil plane, the modulated optical transfer function is defocus-invariant. In this paper, we proposed a new form phase mask using non integer order and signum function to extend the depth of field. The performance of the phase mask is evaluated by comparing defocused modulation transfer function invariant and Fisher information with other phase masks. Defocused imaging simulation is also carried out. The results demonstrate the advantages of non-integer order phase mask and its effectiveness on the depth of field extension. (C) 2016 Elsevier B.V. All rights reserved.

关键词： wavefront coding Non-integer phase mask Depth of field Imaging system

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Inverse sinusoidal phase mask to extend the depth of field of incoherent imaging systems

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OPTIK 2016年第20期127卷 9105-9110页

作者： Zhou, Liang Liu, Zhaohui She, Wenji Shan, Qiusha Chinese Acad Sci Xian Inst Opt & Precis Mech Xian 710119 Shaanxi Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China

wavefront coding is an effective way to extend the depth of field of an incoherent imaging system. With a suitable phase mask, the defocus invariant imaging characteristic of an incoherent imaging system can be achieved. In this paper, an effective way to generate new type of phase mask is proposed. On the basis of the new method, the inverse sinusoidal phase mask is proposed to enrich the family of anti-symmetric phase masks. The performances of inverse sinusoidal phase mask are evaluated by comparisons with cubic, sinusoidal and tangent phase masks. Numerical evaluations demonstrate that the proposed phase mask has superior performance in extending the depth of field and small artifacts in restored images, particularly at large defocus. (C) 2016 Elsevier GmbH. All rights reserved.

关键词： wavefront coding Extended depth of field Image artifacts Optical transfer function

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Characterization of a three-dimensional double-helix point-spread function for fluorescence microscopy in the presence of spherical aberration

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JOURNAL OF BIOMEDICAL OPTICS 2013年第3期18卷 1-10页

作者： Ghosh, Sreya Preza, Chrysanthe Univ Memphis Dept Elect & Comp Engn Memphis TN 38152 USA

We characterize the three-dimensional (3-D) double-helix (DH) point-spread function (PSF) for depth-variant fluorescence microscopy imaging motivated by our interest to integrate the DH-PSF in computational optical sectioning microscopy (COSM) imaging. Physical parameters, such as refractive index and thickness variability of imaging layers encountered in 3-D microscopy give rise to depth-induced spherical aberration (SA) that change the shape of the PSF at different focusing depths and render computational approaches less practical. Theoretical and experimental studies performed to characterize the DH-PSF under varying imaging conditions are presented. Results show reasonable agreement between theoretical and experimental DH-PSFs suggesting that our model can predict the main features of the data. The depth-variability of the DH-PSF due to SA, quantified using a normalized mean square error, shows that the DH-PSF is more robust to SA than the conventional PSF. This result is also supported by the frequency analysis of the DH-PSF shown. Our studies suggest that further investigation of the DH-PSF's use in COSM is warranted, and that particle localization accuracy using the DH-PSF calibration curve in the presence of SA can be improved by accounting for the axial shift due to SA. (C) 2013 Society of Photo-Optical Instrumentation Engineers (SPIE)

关键词： double-helix point-spread function wavefront coding computational imaging spherical aberration three-dimensional fluorescence microscopy computational optical sectioning

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