Zobrazeno 1 - 10
of 96
pro vyhledávání: '"near-field diffraction"'
Publikováno v:
Компьютерная оптика, Vol 44, Iss 4, Pp 493-500 (2020)
In contrast to the orbital angular momentum (OAM), which is conserved on free space propagation, the topological charge (TC) of a paraxial optical vortex (OV) is not conserved in the general case. Here, we investigate a Gaussian beam with a fractiona
Externí odkaz:
https://doaj.org/article/65fb7e63f3af410991bf2a2124d270c5
Publikováno v:
Photonics, Vol 10, Iss 4, p 469 (2023)
Fork-shaped gratings are periodic structures containing a spatial dislocation known to be used for the production of optical vortices in a far field. Spatial overlapping of diffraction orders in a near field results in complex spatial evolution of op
Externí odkaz:
https://doaj.org/article/a6aa955060aa4adabdd975d6683676a5
Autor:
Sushanta Barman, Sudeep Bhattacharjee
Publikováno v:
New Journal of Physics, Vol 25, Iss 8, p 083044 (2023)
Self-imaging in near-field diffraction is a practical application of coherent manipulation of matter waves in Talbot interferometry. In this work, near-field diffraction of protons by a nanostructured metallic grating under the influence of (a) unifo
Externí odkaz:
https://doaj.org/article/f5fed0c751c44116bc84a55f6534a601
Publikováno v:
Компьютерная оптика, Vol 43, Iss 2, Pp 184-192 (2019)
The solution of the problem of overcoming the diffraction limit based on the representation of an optical signal in the form of a superposition of communication modes matched with the vortex eigenfunctions of a bounded (in the object and spectral reg
Externí odkaz:
https://doaj.org/article/a48e94120da74411936fd995b5883a56
Autor:
Mojtahedi, Simon
This thesis explores how the diffraction pattern in the near-field region of a chromium feature edge on a photomask gets altered for three scenarios: First, an analytical study using the Fresnel diffraction integral is performed that investigates wha
Externí odkaz:
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-533774
Publikováno v:
Nanophotonics, Vol 8, Iss 2, Pp 317-324 (2019)
We propose a vortex beam generator based on a nanometer spiral slit and explore the propagation rule of the topological charge. Compared to the common methods of generation of a vortex beam with a fixed topological charge, the optical vortex generate
Externí odkaz:
https://doaj.org/article/3d5c84403e2b4f30a62fba12c9a51072
Autor:
Jing Fang, Changda Zhou, Zhen Mou, Shuyun Wang, Jiayi Yu, Yuanjie Yang, Gregory J Gbur, Shuyun Teng, Yangjian Cai
Publikováno v:
New Journal of Physics, Vol 23, Iss 3, p 033013 (2021)
Highly localized plasmonic vortices carrying orbital angular momentum are of importance for many applications. Yet, it is a challenge to generating plasmonic vortex with a high topological charge because of no available technique. Here, a novel plasm
Externí odkaz:
https://doaj.org/article/e0bdadb400c74baf84723cfcd99e5d5b
Akademický článek
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Akademický článek
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Publikováno v:
Nanophotonics, Vol 8, Iss 2, Pp 317-324 (2019)
We propose a vortex beam generator based on a nanometer spiral slit and explore the propagation rule of the topological charge. Compared to the common methods of generation of a vortex beam with a fixed topological charge, the optical vortex generate
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c08800769b1e50f215db41f3d08f6185
https://doi.org/10.1515/nanoph-2018-0214
https://doi.org/10.1515/nanoph-2018-0214