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Free-space high-Q nanophotonics [PDF]
Light: Science & ApplicationsHigh-Q nanophotonic devices hold great importance in both fundamental research and engineering applications. Their ability to provide high spectral resolution and enhanced light-matter interactions makes them promising in various fields such as sensing ...
Jianbo Yu, Wenzhe Yao, Min Qiu, Qiang Li
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Free-space optical spiking neural network [PDF]
PLoS ONENeuromorphic engineering has emerged as a promising avenue for developing brain-inspired computational systems. However, conventional electronic AI-based processors often encounter challenges related to processing speed and thermal dissipation.
Reyhane Ahmadi +2 more
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Optical vortex-antivortex crystallization in free space [PDF]
Nature CommunicationsStable vortex lattices are basic dynamical patterns which have been demonstrated in physical systems including superconductor physics, Bose-Einstein condensates, hydrodynamics and optics. Vortex-antivortex (VAV) ensembles can be produced, self-organizing
Haolin Lin +7 more
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Diffractive optical computing in free space [PDF]
Nature CommunicationsStructured optical materials create new computing paradigms using photons, with transformative impact on various fields, including machine learning, computer vision, imaging, telecommunications, and sensing.
Jingtian Hu +5 more
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A Compact Double-Ridged Horn Antenna for Ultra-Wide Band Microwave Imaging
IEEE Open Journal of Antennas and Propagation, 2021 In this paper, we introduce a novel and compact double-ridged horn (DRH) antenna for ultra-wide band microwave imaging. We first develop theoretical considerations useful to derive effective design guidelines and, thus, realizing the antenna model ...
Stefania Diana +4 more
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Planar Offset Short Applicable to the Calibration of a Free-Space Material Measurement System in W-Band [PDF]
Journal of Electromagnetic Engineering and Science, 2021 The electrical properties of materials and their dependence on frequency and temperature are indispensable in designing electromagnetic devices and systems in various areas of engineering and science for both basic and applied researches.
Jin-Seob Kang, Jeong-Hwan Kim
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Journal of Seed Science, 2023 : Image analysis techniques are expanding in agriculture and, for being fast, simple, and not destroying samples, they are interesting alternatives in the detection of immature rice seeds.
Artur Sousa Silva +3 more
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Photonics, 2023 This work presents a generalized angle-dependent ray transfer function that can accurately map the angular and spatial distribution of light intensities on the tissue surface onto a camera image plane in a non-contact camera-based imaging system.
Stephen Hyunkeol Kim +2 more
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Multi-channel free space optical convolutions [PDF]
EPJ Web of Conferences, 2023 Convolutional layers are a critical feature of modern neural networks and require significant com-putational resources. In response, optical accelerators have been developed as a low-energy, high-bandwidth approach for performing large-scale convolutions.
Song Alexander +2 more
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Singularity-free space-time [PDF]
Physical Review D, 1992 We show that the solution published in Ref.1 is geodesically complete and singularity-free. We also prove that the solution satisfies the stronger energy and causality conditions, such as global hyperbolicity, causal symmetry and causal stability. A detailed discussion about which assumptions in the singularity theorems are not fulfilled is performed ...
Chinea, F. J. (Francisco Javier), 1949- +2 more
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