Results 1 to 10 of about 13,209,050 (212)
Far-field optical nanoscopy [PDF]
2010 IEEE Photinic Society's 23rd Annual Meeting, 2007 In 1873, Ernst Abbe discovered what was to become a well-known paradigm: the inability of a lens-based optical microscope to discern details that are closer together than half of the wavelength of light. However, for its most popular imaging mode, fluorescence microscopy, the diffraction barrier is crumbling.
S. Hell
openaire +6 more sources
Far-field and near-field directionality in acoustic scattering [PDF]
New Journal of Physics, 2020 Far-field directional scattering and near-field directional coupling from simple sources have recently received great attention in photonics: beyond circularly-polarized dipoles, whose directional coupling to evanescent waves was recently applied to ...
Lei Wei, Francisco J Rodríguez-Fortuño
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Far-field super-resolution chemical microscopy [PDF]
Light: Science & Applications, 2023 Far-field chemical microscopy providing molecular electronic or vibrational fingerprint information opens a new window for the study of three-dimensional biological, material, and chemical systems.
Mingwei Tang +4 more
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Far-field ultrasonic imaging using hyperlenses [PDF]
Scientific Reports, 2022 Hyperlenses for ultrasonic imaging in nondestructive evaluation and non-invasive diagnostics have not been widely discussed, likely due to the lack of understanding on their performance, as well as challenges with reception of the elastic wavefield past ...
Mohamed Subair Syed Akbar Ali +1 more
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Real-Time Far-Field BCSDF Filtering [PDF]
Journal of ImagingThe real-time rendering of large-scale curve-based surfaces (e.g., hair, fabrics) requires efficient handling of bidirectional curve-scattering distribution functions (BCSDFs).
Junjie Wei, Ying Song
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Channel Estimation for Extremely Large-Scale MIMO: Far-Field or Near-Field? [PDF]
IEEE Transactions on Communications, 2021 Extremely large-scale multiple-input-multiple-output (XL-MIMO) is promising to meet the high rate requirements for future 6G. To realize efficient precoding, accurate channel state information is essential. Existing channel estimation algorithms with low
Mingyao Cui, Linglong Dai
semanticscholar +1 more source
6G Wireless Communications: From Far-Field Beam Steering to Near-Field Beam Focusing [PDF]
IEEE Communications Magazine, 2022 6G networks will be required to support higher data rates, improved energy efficiency, lower latency, and more diverse users compared with 5G systems. To meet these requirements, electrically extremely large-scale antenna arrays are envisioned to be key ...
Haiyang Zhang +4 more
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Channel Estimation for Extremely Large-Scale Massive MIMO: Far-Field, Near-Field, or Hybrid-Field? [PDF]
IEEE Communications Letters, 2021 Extremely large-scale massive MIMO (XL-MIMO) is a promising technique for future 6G communications. However, existing far-field or near-field channel model mismatches the hybrid-field channel feature in the practical XL-MIMO system.
Xiuhong Wei, Linglong Dai
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Mixed Near- and Far-Field Communications for Extremely Large-Scale Array: An Interference Perspective [PDF]
IEEE Communications Letters, 2023 Extremely large-scale array (XL-array) is envisioned to achieve super-high spectral efficiency in future wireless networks. Different from the existing works that mostly focus on the near-field communications, we consider in this letter a new and ...
Yunpu Zhang +3 more
semanticscholar +1 more source
Codebook design and beam training for extremely large-scale RIS: Far-field or near-field? [PDF]
China Communications, 2021 Reconfigurable intelligent surface (RIS) is more likely to develop into extremely large-scale RIS (XL-RIS) to efficiently boost the system capacity for future 6G communications. Beam training is an effective way to acquire channel state information (CSI)
Xiuhong Wei +4 more
semanticscholar +1 more source