Results 51 to 60 of about 2,554 (206)
Manipulating self-focusing beams induced by high-dimensional parabolic umbilic beams
Results in Physics, 2023 The excellent property that the intensity of autofocusing beams in the focal plane increases exponentially, makes them especially beneficial for biomedical treatment.
Zhuo Sun +4 more
doaj +1 more source
Spiral phase modulation based deep learning for autofocusing
, 2022 We demonstrate the use of spiral phase modulation in preprocessing defocused image before feeding into deep learning model for autofocusing. Average predict error is shown to outperform previously published works on an open dataset.
Chan, Ryan K Y +2 more
core +1 more source
Implementation and Optimization of a Dual-confocal Autofocusing System
Sensors, 2020 This paper describes the implementation and optimization of a dual-confocal autofocusing system that can easily describe a real-time position by measuring the response signal (i.e., intensity) of the front and the rear focal points of the system. This is
Chia-Ming Jan +2 more
doaj +1 more source
HoloSpec: Dispersion‐Based 4D Computational Holographic Hyperspectral Imaging
Laser &Photonics Reviews, EarlyView.HoloSpec, a compact dispersion‐based computational holographic system, achieves four‐dimensional imaging by retrieving 3D spatial structure and high‐resolution spectra from only two monochromatic snapshots. Using a single prism and a monochrome sensor, it resolves 430 spectral channels with 3 nm experimental resolution and 30 μm$\mathrm{\mu}\mathrm{m}$
Jingyan Chen +3 more
wiley +1 more source
Accelerating and abruptly-autofocusing beam waves in the Fresnel zone of antenna arrays [PDF]
, 2013 We introduce the concept of spatially accelerating (curved) beam waves in the Fresnel region of properly designed antenna arrays. These are transversely localized EM waves that propagate in free space in a diffraction-resisting manner, while at the same ...
Chremmos, Ioannis +2 more
core +1 more source
Abnormally autofocusing vortex Swallowtail Gaussian vector beam with low spatial coherence
New Journal of Physics, 2023 The precondition for the application of light beams is the ability to devise light distribution with high precision. Controlling more dimensions for structured light fields is an effective method to improve the ability to devise light distribution.
Jingyi Shi +5 more
doaj +1 more source
Results in Physics, 2023 This paper presents an innovative form of the symmetric and autofocusing beam in theory and experiment. These symmetric Olver beams (SOBs) originate from the spectral symmetry phase of the Olver beams.
Yidan Sun +7 more
doaj +1 more source
BJOG: An International Journal of Obstetrics &Gynaecology, EarlyView.ABSTRACT Objective To demonstrate the presence of peritoneal fluid (PF)‐derived small extracellular vesicles (sEVs) in endometriosis and control samples, to characterise their protein content and to define endometriosis‐specific biomarkers within the sEV proteome. Design Case–control experimental study. Setting Academic endometriosis centre.
Hannah M. Nazri +8 more
wiley +1 more source
Sensors, 2017 A high resolution inverse synthetic aperture radar (ISAR) technique is presented using modified Doppler history based motion compensation. To this purpose, a novel wideband ISAR system is developed that accommodates parametric processing over extended ...
Jung-Hwan Song +3 more
doaj +1 more source
Design and Experimental Validation of an Optical Autofocusing System with Improved Accuracy
Photonics, 2023 This study proposes a modified optical design to improve the issue of autofocus accuracy in existing optical systems. The proposed system uses lens offset to convert incident light into non-parallel light, achieving a focus shift and avoiding severe ...
Jui-Hsiang Hung +3 more
doaj +1 more source