Results 31 to 40 of about 87,657 (169)

Axial intensity distribution of a micro-Fresnel zone plate at an arbitrary numerical aperture.

Optics Express, 2021
The axial focus number (the number of focal spots along the axial direction) and focus intensity of a micro-Fresnel zone plate (FZP) are analyzed from deep ultraviolet to infrared using the Fourier decomposition, the vectorial angular spectrum (VAS ...
Qiang Liu, Tao Liu, Shuming Yang, Guoqing Li, Shaobo Li, Tao He   +5 more
semanticscholar   +1 more source

High frequency focal transducer with a Fresnel zone plate for intravascular ultrasound

Applied Physics Letters, 2021
The diameter of an intravascular ultrasound (IVUS) catheter is always less than 1 mm, because it must be inserted into a blood vessel to obtain ultrasound images.
Min Su, Xiangxiang Xia, Baoqiang Liu, Zhiqiang Zhang, Rong Liu, Feiyan Cai, W. Qiu, Lei Sun   +7 more
semanticscholar   +1 more source

Resolutions in Imaging with Fresnel Zone Plate

RADIOISOTOPES, 1978
A coarse Fresnel zone plate (FZP) may be used as a large-area coded aperture for imaging incoherent sources. The longitudinal and lateral spatial resolutions are discussed on the basis of experiment using an FZP having 18 or 19 zones as an aperture. In this paper, it is then shown that the lateral spatial resolution is about 5 mm and the longitudinal ...
ITAYA, Gensei, KOJIMA, Kazuhiko
openaire   +3 more sources

Enhanced imaging with binary circular Dammann Fresnel zone plate.

Optics Express
We introduce a novel approach in optical engineering by combining Dammann gratings with binary Fresnel zone plates to create a unique hybrid optical element with enhanced energetic efficiency of its focal spots.
Stefan R. Anton, Nadav Shabairou, S. Stanciu, G. Stanciu, Z. Zalevsky   +4 more
semanticscholar   +1 more source

Hard X-ray nano-holotomography with a Fresnel zone plate.

Optics Express, 2020
X-ray phase contrast nanotomography enables imaging of a wide range of samples with high spatial resolution in 3D. Near-field holography, as one of the major phase contrast techniques, is often implemented using X-ray optics such as Kirkpatrick-Baez ...
S. Flenner, A. Kubec, C. David, M. Storm, Clemens F Schaber, F. Vollrath, M. Müller, I. Greving, J. Hagemann   +8 more
semanticscholar   +1 more source

Fresnel zone plate development for x-ray radiography of hydrodynamic instabilities at the National Ignition Facility.

Applied Optics, 2020
The study of Rayleigh-Taylor (RT) and Richtmyer-Meshkov (RM) instabilities in a planar geometry at high energy densities at the National Ignition Facility (NIF) requires high spatial resolution imaging. We demonstrate the potential of Fresnel zone plates
A. Do, L. Pickworth, B. Kozioziemski, A. Angulo, G. Hall, S. Nagel, D. Bradley, T. Mccarville, J. Ayers   +8 more
semanticscholar   +1 more source

Direct replication of a glass micro Fresnel zone plate array by laser irradiation using an infrared transmissive mold.

Optics Express, 2020
It is not yet possible to fabricate micrometer-scale, glass optical components with nanometer-scale precision. Glass thermal imprinting enhances production efficiency.
Runjia Han, Juho Lee, Baekcheon Seong, Ryung Shin, Donghyun Kim, Changsu Park, Jiseok Lim, C. Joo, Shinill Kang   +8 more
semanticscholar   +1 more source

Supplementary Zones-surrounded Fresnel Zone Plate

JSAP Annual Meetings Extended Abstracts, 2014
The supplementary zones surround an ordinary Fresnel Zone Plate (FZP) are used to improve the optical resolution at focus. Based on the Fresnel-Kirchhoff diffraction formula, an optimization model is used to design the supplementary zones-included FZP (SZFZP).
Lee, Yen-Min, Chen, Szu-Hung, Chiou, Pei-Chuen, Tsai, Kuen-Yu, Chung, Tien-Tung, Tsai, Cheng-Han, Liu, Zhan-Yu, Li, Jia-Han   +7 more
openaire   +2 more sources

Time‐Resolved Simultaneous Mapping of Thickness and Nanoparticle Concentration in Nanofluid Thin Films via Imaging Ellipsometry and Deep‐UV Reflectance Imaging

Advanced Materials Interfaces, EarlyView.
This study establishes a dual‐channel optical metrology framework integrating phase‐shifting imaging ellipsometry and deep‐UV reflectance imaging. This label‐free approach enables simultaneous, time‐resolved mapping of film thickness and nanoparticle (NP) concentration in dynamic nanofluid thin films.
Eita Shoji, Keita Aizawa, Hiroki Kusudo, Tetsushi Biwa   +3 more
wiley   +1 more source

3D Large‐Scale Subwavelength‐Resolution Sound Sheet Tomography Based on an Active and Programmable Circular Meta‐Array

Advanced Science, EarlyView.
A programmable 2048‐element circular ultrasound array combined with a compact acoustic lens produces a thin “sound sheet” over a large field of view, and records echoes with wide angular diversity across the ring aperture. Coherence‐enhanced beamforming converts full‐matrix data into high‐contrast tomographic slices, delivering near‐diffraction‐limited
Qiu‐De Zhang, Zi‐Bin Lin, Zhuo Chen, Zhao‐Hui Liu, Jin‐Lian He, Jun‐Jie Song, Long‐Sheng Zeng, Liang Zhou, Ming‐Yue Ding, Yu‐Gui Peng, Ming Yuchi, Xue‐Feng Zhu   +11 more
wiley   +1 more source