Results 31 to 40 of about 221,879 (297)

Thin high numerical aperture metalens

Optics Express, 2017
We designed, fabricated, and characterized a thin metalens in an amorphous silicon film of diameter 30 µm, focal length equal to the incident wavelength 633 nm. The lens is capable of simultaneously manipulating the state of polarization and phase of incident light.
Kotlyar, V. V., Nalimov, A. G., Stafeev, S. S., Hu, Changyu, O'Faolain, L., Kotlyar, M. V., Gibson, D., Song, S.   +7 more
openaire   +4 more sources

Benzene Shape Photonic Crystal Fiber Based Plasma Sensor: Design and Analysis

Photonic Sensors, 2018
A novel benzene core photonic crystal fiber (BC-PCF) is proposed for plasma sensing applications. The proposed BC-PCF parameters have been tuned to gain high sensitivity, high numerical aperture (NA), and low confinement loss, and modality over the ...
Md. Toriqul Islam, Md. Golam Moctader, Kawsar Ahmed, Sawrab Chowdhury   +3 more
doaj   +1 more source

Design of 3D SAW Filters Based on the Spectral Element Method

IEEE Access, 2023
Surface acoustic wave (SAW) devices are key components in 5G communication systems, and the design of SAW filters with high frequency, high performance and high reliability is a necessary and challenging task. In this work, SAW resonators with $LiNbO_{3}
Yiwen Yao, Mingwei Zhuang, Junhui Chen, Ke Chen, Qing Huo Liu   +4 more
doaj   +1 more source

Particle tracking stereomicroscopy in optical tweezers: control of trap shape [PDF]

, 2010
We present an optical system capable of generating stereoscopic images to track trapped particles in three dimensions. Two-dimensional particle tracking on each image yields three dimensional position information.
Asavei, Ashkin, Ashkin, Cheong, Cizmar, Crocker, Dam, Dam, Galajda, Gibson, Graham Gibson, Grier, Ikin, Leach, Leach, Lee, McLeod, Miles Padgett, Otto, O’Neil, Pacoret, Pavani, Pavani, Perch-Nielsen, Preece, Reicherter, Richard Bowman, Rodrigo, Rodrigo, Rohrbach, Sinclair, Singer, Speidel, Svoboda, Zhang   +34 more
core   +1 more source

Theory of Optical Tweezers [PDF]

, 1999
We derive a partial-wave (Mie) expansion of the axial force exerted on a transparent sphere by a laser beam focused through a high numerical aperture objective. The results hold throughout the range of interest for practical applications.
, , Ashkin A., Bohren C. F., Edmonds A. R., Friese M. E. J. ., H. M Nussenzveig, Nussenzveig H. M., P. A. Maia Neto, Roosen G.   +9 more
core   +2 more sources

A Metalens with a Near-Unity Numerical Aperture [PDF]

Nano Letters, 2018
The numerical aperture (NA) of a lens determines its ability to focus light and its resolving capability. Having a large NA is a very desirable quality for applications requiring small light-matter interaction volumes or large angular collections. Traditionally, a large NA lens based on light refraction requires precision bulk optics that ends up being
Ramón Paniagua-Domínguez, Ye Feng Yu, Egor Khaidarov, Sumin Choi, Victor Leong, Reuben M. Bakker, Xinan Liang, Yuan Hsing Fu, Vytautas Valuckas, Leonid A. Krivitsky, Arseniy I. Kuznetsov   +10 more
openaire   +3 more sources

Large-area, high-numerical-aperture, freeform metasurfaces

Optica Design and Fabrication Congress 2025 (FlatOptics, Freeform, OFT), 2023
We design and experimentally demonstrate multifunctional super-dispersive metalenses using a novel gradient-based design framework that enhances nonlocal interactions between nanostructures. We demonstrate its application in high throughput additive manufacturing systems.
You Zhou, Chenkai Mao, Erez Gershnabel, Mingkun Chen, Jonathan Fan   +4 more
openaire   +1 more source

A Novel Hexahedron Photonic Crystal Fiber in Terahertz Propagation: Design and Analysis

Photonics, 2019
A novel hexahedron fiber has been proposed for biomedical imaging applications and efficient guiding of terahertz radiation. A finite element method (FEM) has been applied to investigate the guiding properties rigorously.
Bikash Kumar Paul, Md. Ashraful Haque, Kawsar Ahmed, Shuvo Sen   +3 more
doaj   +1 more source

Permeability of self-affine rough fractures

, 2000
The permeability of two-dimensional fractures with self-affine fractal roughness is studied via analytic arguments and numerical simulations. The limit where the roughness amplitude is small compared with average fracture aperture is analyzed by a ...
B. B. Mandelbrot, D. H. Rothman, D. J. Bergman, E. Bouchaud, E. Bouchaud, F. A. L. Dullien, F. Plouraboué, F. Plouraboué, F. Plouraboué, G. K. Batchelor, German Drazer, H. K. Moffatt, H. Press, I. Ippolito, J. Boffa, J. Feder, Joel Koplik, M. Sahimi, M. Sahimi, P. L. Bathnagar, S. Roux, S. Roux, Y. H. Qian   +22 more
core   +1 more source

Ultrahigh Numerical Aperture Metalens at Visible Wavelengths [PDF]

Nano Letters, 2018
22 pages, 7 figures, an original journal ...
Liang, Haowen, Lin, Qiaoling, Xie, Xiangsheng, Sun, Qian, Wang, Yin, Zhou, Lidan, Liu, Lin, Yu, Xiangyang, Zhou, Jianying, Krauss, Thomas F., Li, Juntao   +10 more
openaire   +4 more sources