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  • Optica Publishing Group  (19)
  • 1
    Online Resource
    Online Resource
    Convolutional symmetric compressed look-up-table method for 360° dynamic color 3D holographic display
    Optica Publishing Group ; 2023
    In:  Optics Express Vol. 31, No. 18 ( 2023-08-28), p. 28716-
    Details
    In: Optics Express, Optica Publishing Group, Vol. 31, No. 18 ( 2023-08-28), p. 28716-
    Abstract: In this paper, we propose a convolutional symmetric compressed look-up-table (CSC-LUT) method to accelerate computer-generated hologram (CGH) computation based on the Fresnel diffraction theory and LUT. The proposed method can achieve one-time high-quality fast generation of color holograms by utilizing dynamic convolution operation, which is divided three processes. Firstly, the pre-calculated data of maximum horizontal modulation factor is compressed in 1D array by coordinate symmetry. Then, the test object is resampled to satisfy convolutional translation invariance. Finally, the dynamic convolution operation is used to simplify CGH computation process rather than the point-by-point computation. Numerical simulation and optical experimental results show that our proposed method can achieve faster computation speed, higher reconstruction quality and wider application compared to conventional SC-LUT method. The further optimization method for parallel acceleration on the GPU framework can achieve real-time ( 〉 24fps) color holographic display corresponding to three perspectives of a 3D scene.
    Type of Medium: Online Resource
    ISSN: 1094-4087
    URL: Article
    DOI: 10.1364/OE.494745
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2023
    detail.hit.zdb_id: 1491859-6
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  • 2
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    High-performance β-Ga 2 O 3 -based solar-blind photodetector with ultralow dark current and fast photoresponse for deep-ultraviolet communication
    Optica Publishing Group ; 2022
    In:  Optical Materials Express Vol. 12, No. 1 ( 2022-01-01), p. 327-
    Details
    In: Optical Materials Express, Optica Publishing Group, Vol. 12, No. 1 ( 2022-01-01), p. 327-
    Abstract: Solar-blind deep-ultraviolet communication (SDUC) presents a promising candidate for use in short-range military communications. Solar-blind photodetectors (PDs) form up the core component of the SDUC system’s receiving signal. In this study, an easy-to-integrate metal-semiconductor-metal (MSM)-type solar-blind PD is successfully fabricated based on the β-Ga 2 O 3 film deposited on c-plane sapphire substrates by low-cost radio-frequency magnetron sputtering. The fabricated device exhibits a high responsivity of 1.93 A W −1 , a remarkable detectivity of 6.53×10 13 Jones, and a considerable photo-to-dark current ratio of 3.58×10 5 . Most importantly, the device shows an extremely low dark current of 82 fA and an ultrafast response speed of 11/240 µs; one of the most ultra-high performances ever reported for β-Ga 2 O 3 solar-blind PDs. In addition, it is the first time that a high-performance β-Ga 2 O 3 -based PD that is integrated into a self-made SDUC system as a signal receiver is demonstrated to transmit ASCII codes with such high accuracy and a data rate of 10 kbps. The results reported in this work serve as proof-of-concept for future applications of β-Ga 2 O 3 solar-blind deep-ultraviolet photodetectors in secure communications.
    Type of Medium: Online Resource
    ISSN: 2159-3930
    URL: Article
    DOI: 10.1364/OME.449496
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2022
    detail.hit.zdb_id: 2619914-2
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  • 3
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    Metalens-based stereoscopic microscope
    Optica Publishing Group ; 2022
    In:  Photonics Research Vol. 10, No. 6 ( 2022-06-01), p. 1501-
    Details
    In: Photonics Research, Optica Publishing Group, Vol. 10, No. 6 ( 2022-06-01), p. 1501-
    Abstract: Stereoscopic microscopy is a promising technology to obtain three-dimensional microscopic images. Such microscopes are based on the parallax effect, and as such require two lenses to focus at two different points. Geometrical constraints, however, restrict their numerical apertures to about 0.2, thus limiting the system’s resolution. Higher numerical apertures ( ∼ 0.35 ) can be achieved with designs using only one bulk lens, but such systems are ∼ 10 times more costly than the conventional ones. Thus, there is a pressing need for alternative solutions to improve the resolution of stereoscopic systems. Here, we show that high-resolution and low-cost stereoscopic systems can be obtained using birefringent single-layer metalenses. We design and fabricate a birefringent metalens operating at 532 nm with a numerical aperture as high as 0.4. The metalens is then used to demonstrate high-resolution stereoscopic imaging of biological samples. The microscopic images are further displayed and perceived vividly in an autostereoscopic display. Our demonstration paves the way to a new strategy to achieve high-resolution and low-cost stereoscopic microscopes.
    Type of Medium: Online Resource
    ISSN: 2327-9125
    URL: Article
    DOI: 10.1364/PRJ.456638
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2022
    detail.hit.zdb_id: 2724783-1
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  • 4
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    Online Resource
    Ultrafast switching of optical singularity eigenstates with compact integrable liquid crystal structures
    Optica Publishing Group ; 2018
    In:  Optics Express Vol. 26, No. 22 ( 2018-10-29), p. 28818-
    Details
    In: Optics Express, Optica Publishing Group, Vol. 26, No. 22 ( 2018-10-29), p. 28818-
    Type of Medium: Online Resource
    ISSN: 1094-4087
    URL: Article
    DOI: 10.1364/OE.26.028818
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2018
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  • 5
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    Online Resource
    End-to-end real-time holographic display based on real-time capture of real scenes
    Optica Publishing Group ; 2023
    In:  Optics Letters Vol. 48, No. 7 ( 2023-04-01), p. 1850-
    Details
    In: Optics Letters, Optica Publishing Group, Vol. 48, No. 7 ( 2023-04-01), p. 1850-
    Abstract: Holographic display is considered as a promising three-dimensional (3D) display technology and has been widely studied. However, to date, the real-time holographic display for real scenes is still far from being incorporated in our life. The speed and quality of information extraction and holographic computing need to be further improved. In this paper, we propose an end-to-end real-time holographic display based on real-time capture of real scenes, where the parallax images are collected from the scene and a convolutional neural network (CNN) builds the mapping from the parallax images to the hologram. Parallax images are acquired in real time by a binocular camera, and contain depth information and amplitude information needed for 3D hologram calculation. The CNN, which can transform parallax images into 3D holograms, is trained by datasets consisting of parallax images and high-quality 3D holograms. The static colorful reconstruction and speckle-free real-time holographic display based on real-time capture of real scenes have been verified by the optical experiments. With simple system composition and affordable hardware requirements, the proposed technique will break the dilemma of the existing real-scene holographic display, and open up a new direction for the application of real-scene holographic 3D display such as holographic live video and solving vergence-accommodation conflict (VAC) problems for head-mounted display devices.
    Type of Medium: Online Resource
    ISSN: 0146-9592 , 1539-4794
    URL: Article
    DOI: 10.1364/OL.479652
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2023
    detail.hit.zdb_id: 243290-0
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  • 6
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    Online Resource
    Focusing light through scattering media by transmission matrix inversion
    Optica Publishing Group ; 2017
    In:  Optics Express Vol. 25, No. 22 ( 2017-10-30), p. 27234-
    Details
    In: Optics Express, Optica Publishing Group, Vol. 25, No. 22 ( 2017-10-30), p. 27234-
    Type of Medium: Online Resource
    ISSN: 1094-4087
    URL: Article
    DOI: 10.1364/OE.25.027234
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2017
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  • 7
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    16-channel photonic–electric co-designed silicon transmitter with ultra-low power consumption
    Optica Publishing Group ; 2023
    In:  Photonics Research Vol. 11, No. 2 ( 2023-02-01), p. 143-
    Details
    In: Photonics Research, Optica Publishing Group, Vol. 11, No. 2 ( 2023-02-01), p. 143-
    Abstract: A hybrid integrated 16-channel silicon transmitter based on co-designed photonic integrated circuits (PICs) and electrical chiplets is demonstrated. The driver in the 65 nm CMOS process employs the combination of a distributed architecture, two-tap feedforward equalization (FFE), and a push–pull output stage, exhibiting an estimated differential output swing of 4.0 V pp . The rms jitter of 2.0 ps is achieved at 50 Gb/s under nonreturn-to-zero on–off keying (NRZ-OOK) modulation. The PICs are fabricated on a standard silicon-on-insulator platform and consist of 16 parallel silicon dual-drive Mach–Zehnder modulators on a single chip. The chip-on-board co-packaged Si transmitter is constituted by the multichannel chiplets without any off-chip bias control, which significantly simplifies the system complexity. Experimentally, the open and clear optical eye diagrams of selected channels up to 50 Gb/s OOK with extinction ratios exceeding 3 dB are obtained without any digital signal processing. The power consumption of the Si transmitter with a high integration density featuring a throughput up to 800 Gb/s is only 5.35 pJ/bit, indicating a great potential for massively parallel terabit-scale optical interconnects for future hyperscale data centers and high-performance computing systems.
    Type of Medium: Online Resource
    ISSN: 2327-9125
    URL: Article
    DOI: 10.1364/PRJ.469556
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2023
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  • 8
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    Online Resource
    Dual convolutional neural network for aberration pre-correction and image quality enhancement in integral imaging display
    Optica Publishing Group ; 2023
    In:  Optics Express Vol. 31, No. 21 ( 2023-10-09), p. 34609-
    Details
    In: Optics Express, Optica Publishing Group, Vol. 31, No. 21 ( 2023-10-09), p. 34609-
    Abstract: This paper proposes a method that utilizes a dual neural network model to address the challenges posed by aberration in the integral imaging microlens array (MLA) and the degradation of 3D image quality. The approach involves a cascaded dual convolutional neural network (CNN) model designed to handle aberration pre-correction and image quality restoration tasks. By training these models end-to-end, the MLA aberration is corrected effectively and the image quality of integral imaging is enhanced. The feasibility of the proposed method is validated through simulations and optical experiments, using an optimized, high-quality pre-corrected element image array (EIA) as the image source for 3D display. The proposed method achieves high-quality integral imaging 3D display by alleviating the contradiction between MLA aberration and 3D image resolution reduction caused by system noise without introducing additional complexity to the display system.
    Type of Medium: Online Resource
    ISSN: 1094-4087
    URL: Article
    DOI: 10.1364/OE.501909
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2023
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  • 9
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    Imaging through highly scattering human skulls with ultrasound-modulated optical tomography
    Optica Publishing Group ; 2020
    In:  Optics Letters Vol. 45, No. 11 ( 2020-06-01), p. 2973-
    Details
    In: Optics Letters, Optica Publishing Group, Vol. 45, No. 11 ( 2020-06-01), p. 2973-
    Abstract: Advances in human brain imaging technologies are critical to understanding how the brain works and the diagnosis of brain disorders. Existing technologies have different drawbacks, and the human skull poses a great challenge for pure optical and ultrasound imaging technologies. Here we demonstrate the feasibility of using ultrasound-modulated optical tomography, a hybrid technology that combines both light and sound, to image through human skulls. Single-shot off-axis holography was used to measure the field of the ultrasonically tagged light. This Letter paves the way for imaging the brain noninvasively through the skull, with optical contrast and a higher spatial resolution than that of diffuse optical tomography.
    Type of Medium: Online Resource
    ISSN: 0146-9592 , 1539-4794
    URL: Article
    DOI: 10.1364/OL.390920
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2020
    detail.hit.zdb_id: 243290-0
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  • 10
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    Online Resource
    Viewing angle enhancement for integral imaging display using two overlapped panels
    Optica Publishing Group ; 2023
    In:  Optics Express Vol. 31, No. 13 ( 2023-06-19), p. 21772-
    Details
    In: Optics Express, Optica Publishing Group, Vol. 31, No. 13 ( 2023-06-19), p. 21772-
    Abstract: Integral imaging three-dimensional (3D) display relies on display panel to provide visual information, but the intrinsic trade-off between the wide viewing angle and high resolution refrains its application in high-throughput 3D display. We propose a method to enhance the viewing angle without sacrificing the resolution by using two overlapped panels. The additionally introduced display panel is composed of two parts: the information area and the transparent area. The transparent area loaded with blank information enables light passing through without any modulation, while the opaque information area is loaded with element image array (EIA) for 3D display. The configuration of the introduced panel can block crosstalk from the original 3D display and establish a new and viewable perspective. Experimental results show that the horizontal viewing angle can be effectively extended from 8° to 16°, demonstrating the feasibility and effectiveness of our proposed method. This method provides the 3D display system with a higher space-bandwidth product, making it a potential technique to be applied for high information-capacity display, including integral imaging and holography.
    Type of Medium: Online Resource
    ISSN: 1094-4087
    URL: Article
    DOI: 10.1364/OE.491662
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2023
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