Results 1 to 10 of about 441,106 (295)
Tight focusing field of cylindrical vector beams based on cascaded low-refractive index metamaterials [PDF]
Nanophotonics, 2023 Using low-refractive-index metamaterials, we design a transmission-type radial-angular cylindrical vector beam generator. A high numerical aperture lens is constructed using an asymmetric meta-grating structure. The metamaterial vector beam generator and
Ke Lan +6 more
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Design and Fabrication of Double-Focused Ultrasound Transducers to Achieve Tight Focusing. [PDF]
Sensors (Basel), 2016 Beauty treatment for skin requires a high-intensity focused ultrasound (HIFU) transducer to generate coagulative necrosis in a small focal volume (e.g., 1 mm3) placed at a shallow depth (3–4.5 mm from the skin surface). For this, it is desirable to make the F-number as small as possible under the largest possible aperture in order to generate ...
Jang J, Chang JH.
europepmc +6 more sources
Tight Focusing of Partially Coherent Vortex Beams [PDF]
International Journal of Optics, 2012 Tight focusing of partially polarized vortex beams has been studied. Compact form of the coherence matrix has been derived for polarized vortex beams.
Rakesh Kumar Singh
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PhotonicsThe effects of various properties on the tight focusing of light are considered. In particular, polarization of the incident field is an important consideration.
Colin J. R. Sheppard
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Tight focusing of plane waves from micro-fabricated spherical mirrors
Optics Express, 2008 We derive a formula for the light field of a monochromatic plane wave that is truncated and reflected by a spherical mirror. Our formula is valid even for deep mirrors, where the aperture radius approaches the radius of curvature. We apply this result to
Agrawal +17 more
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Tight Focusing Properties of Ring Pearcey Beams with a Cross Phase
Photonics, 2022 We theoretically investigated the properties of tightly focused ring Pearcey beams with a cross phase (CPRPB). The expressions of the distributions of both electric field and magnetic field in the focal region of an objective were first derived from the ...
Chaoqun Yu +8 more
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Tight focusing with a binary microaxicon [PDF]
Optics Letters, 2011 Using a near-field scanning microscope (NT-MDT) with a 100 nm aperture cantilever held 1 μm apart from a microaxicon of diameter 14 μm and period 800 nm, we measure a focal spot resulting from the illumination by a linearly polarized laser light of wavelength λ=532 nm, with its FWHM being equal to 0.58λ, and the depth of focus being 5.6λ.
Kotlyar, Victor V +3 more
openaire +4 more sources
5D Opto‐Magnetization Endowed by Physics‐Enhanced Deep Learning
Advanced Photonics Research, 2023 In the era of big data, all‐optical control of the magnetization is recognized as an alternative scheme that boosts the accelerating advance of multifunctional integrated opto‐magnetization devices with high‐density capacity.
Weichao Yan +9 more
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Angular and Orbital Angular Momenta in the Tight Focus of a Circularly Polarized Optical Vortex
Photonics, 2023 Based on the Richards-Wolf (RW) formalism, we obtain two different exact expressions for the angular momentum (AM) density of light in the focus of an optical vortex with a topological charge n and right circular polarization.
Victor V. Kotlyar +2 more
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Photonics, 2023 A thorough integral formulation describing the second harmonic generation under tightly focused linearly and radially polarized beams for an arbitrary distribution of the nonlinear susceptibility over the surface of isotropic media was presented.
Sergey Scherbak +3 more
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