Results 1 to 10 of about 221,879 (297)

Optical and Thermal Design and Analysis of Phase-Change Metalenses for Active Numerical Aperture Control [PDF]

Nanomaterials, 2022
The control of a lens’s numerical aperture has potential applications in areas such as photography and imaging, displays, sensing, laser processing and even laser-implosion fusion.
George Braid, Carlota Ruiz de Galarreta, Andrew Comley, Jacopo Bertolotti, C. David Wright   +4 more
doaj   +2 more sources

Ultrahigh numerical aperture meta-fibre for flexible optical trapping [PDF]

Light: Science & Applications, 2021
Strong focusing on diffraction-limited spots is essential for many photonic applications and is particularly relevant for optical trapping; however, all currently used approaches fail to simultaneously provide flexible transportation of light ...
Malte Plidschun, Haoran Ren, Jisoo Kim, Ronny Förster, Stefan A. Maier, Markus A. Schmidt   +5 more
doaj   +2 more sources

Optical trapping at low numerical aperture [PDF]

Journal of the European Optical Society-Rapid Publications, 2011
A theory of optical trapping at low Numerical Aperture (NA) is presented. The theory offers an analytical description of the competition between the stabilizing gradient and destabilizing scattering force.
Stallinga S.
doaj   +5 more sources

High numerical aperture multilayer Laue lenses. [PDF]

Sci Rep, 2015
AbstractThe ever-increasing brightness of synchrotron radiation sources demands improved X-ray optics to utilise their capability for imaging and probing biological cells, nanodevices and functional matter on the nanometer scale with chemical sensitivity.
Morgan AJ, Prasciolu M, Andrejczuk A, Krzywinski J, Meents A, Pennicard D, Graafsma H, Barty A, Bean RJ, Barthelmess M, Oberthuer D, Yefanov O, Aquila A, Chapman HN, Bajt S.   +14 more
europepmc   +6 more sources

Design of a Highly Sensitive Photonic Crystal Fiber Sensor for Sulfuric Acid Detection

Micromachines, 2022
In this research, a photonic crystal fiber (PCF)-based sulfuric acid detector is proposed and investigated to identify the exact concentration of sulfuric acid in a mixture with water.
Md. Ahasan Habib, Lway Faisal Abdulrazak, Musab Magam, Laiq Jamal, Khurram Karim Qureshi   +4 more
doaj   +1 more source

Numerical Aperture-Dependent Spatial Scaling of Plasma Channels in HPHT Diamond

Photonics, 2023
The investigation of plasma channels induced by focused ultra-short 1030-nm laser pulses in bulk of synthetic High Pressure High Temperature (HPHT) diamond revealed strong dependence of their spatial parameters on the used numerical aperture of the lens (
Yulia Gulina, Jiaqi Zhu, George Krasin, Evgeny Kuzmin, Sergey Kudryashov   +4 more
doaj   +1 more source

Numerical Design and Investigation of Circularly Segmented Air Holes-Assisted Hollow-Core Terahertz Waveguide as Optical Chemical Sensor

IEEE Access, 2021
In this paper,a polarization-maintaining single-mode rectangular-shaped hollow-core waveguide with four segmented air cladding in the terahertz (THz) regime is presented for detecting various toxic industrial chemicals.
M. Hussayeen Khan Anik, S. M. Riazul Islam, Shovasis Kumar Biswas, M. Ifaz Ahmad Isti, Mohona Das Gupta, Md. Jalil Piran, Kyung-Sup Kwak, Hriteshwar Talukder   +7 more
doaj   +1 more source

Ultra-wide angle lens design with relative illumination analysis [PDF]

Journal of the European Optical Society-Rapid Publications, 2016
An ultra-wide angle lens design with relative illumination analysis is presented. The half field angle of 80°, the relative illumination of the image plane will be reduced.
Sun W.-S., Tien C.-L., Chen Y.-H., Chu P.-Y.   +3 more
doaj   +1 more source

Linearly polarized field of a flat aperture

Физика волновых процессов и радиотехнические системы, 2023
The article analyzes a flat circular aperture and proposes to use a new analytical expression that describes the radiation pattern of an elementary radiator of an antenna aperture depending on time and integration angle.
Sergey P. Skulkin, Nikolai A. Lysenko, Grigoriy K. Uskov, Nikolai I. Kashcheev, Ksenia V. Smuseva   +4 more
doaj   +1 more source

Strain‐Multiplex Metalens Array for Tunable Focusing and Imaging

Advanced Science, 2021
Metalenses on a flexible template are engineered metal‐dielectric interfaces that improve conventional imaging system and offer dynamic focusing and zooming capabilities by controlling the focal length and bandwidth through a mechanical or external ...
Rajib Ahmed, Haider Butt
doaj   +1 more source