Zobrazeno 1 - 10
of 1 704
pro vyhledávání: '"topological [charge]"'
Publikováno v:
Nanophotonics, Vol 13, Iss 24, Pp 4397-4407 (2024)
Singularity in a two-point complex coherence function, known as coherence vortices, represents zero visibility with a helical phase structure. In this paper, we introduce a novel technique to generate the coherence vortices of different topological c
Externí odkaz:
https://doaj.org/article/e0fb92713f4744f18e17dd84e6adb60e
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Topological phase transition and surface states in a non-Abelian charged nodal line photonic crystal
Publikováno v:
Nanophotonics, Vol 13, Iss 7, Pp 1079-1089 (2024)
Topological charges of nodal lines in a multigap system are represented by non-Abelian numbers, and the Euler class, a topological invariant, can be used to explain their topological phase transitions, such as pair-annihilation of nodal lines. Up unt
Externí odkaz:
https://doaj.org/article/d8e02148ed9e4bb5a5df3797404a9f78
Autor:
Zhao Zhang, Gaoyuan Li, Yonglei Liu, Haiyun Wang, Bernhard J. Hoenders, Chunhao Liang, Yangjian Cai, Jun Zeng
Publikováno v:
Opto-Electronic Science, Vol 3, Iss 1, Pp 1-12 (2024)
The ability to overcome the negative effects, induced by obstacles and turbulent atmosphere, is a core challenge of long-distance information transmission, and it is of great significance in free-space optical communication. The spatial-coherence str
Externí odkaz:
https://doaj.org/article/f4ae8d438d8f410cad9c51559bf9ab0b
Akademický článek
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Publikováno v:
Photonics, Vol 11, Iss 8, p 768 (2024)
Double-ring perfect vortex beams (DR–PVBs) have attracted increasing attention due to their unique characteristics of carrying independent information channels and exhibiting higher security and stability during propagation. In this study, we theor
Externí odkaz:
https://doaj.org/article/d959b4e7c36b487ea2e61deb164c4d97
Publikováno v:
Компьютерная оптика, Vol 47, Iss 3, Pp 350-360 (2023)
The article investigated conditions for shaping astigmatic-invariant structured Laguerre-Gaussian (LG) beams in the case of simple astigmatism. We have theoretically and experimentally confirmed that the conditions of astigmatic invariance are that t
Externí odkaz:
https://doaj.org/article/fb0af2b84d68415da5f840ec7e914e55
Publikováno v:
Компьютерная оптика, Vol 47, Iss 3, Pp 367-373 (2023)
It is shown that a squared Laguerre-Gaussian (LG) vortex beam is Fourier-invariant and retains its structure at the focus of a spherical lens. In the Fresnel diffraction zone, such a beam is transformed into superposition of conventional LG beams, th
Externí odkaz:
https://doaj.org/article/5a8b9b4f647d47c8be2cf1d3e53cacde
Autor:
Zhu Xiangyang, Qiu Song, Liu Tong, Ding You, Tang Ruoyu, Liu Zhengliang, Chen Xiaocen, Ren Yuan
Publikováno v:
Nanophotonics, Vol 12, Iss 12, Pp 2157-2169 (2023)
In most rotational Doppler effect (RDE) measurements, the optical axis and the rotating axis of the object are required to be aligned. However, the condition is very difficult to achieve in practical applications of rotation detection, which seriousl
Externí odkaz:
https://doaj.org/article/f532b626be1c462bbc7b85c4d736d4d3