scholarly journals A Metasurfaces Review: Definitions and Applications

2019 ◽  
Vol 9 (13) ◽  
pp. 2727 ◽  
Author(s):  
Syed S. Bukhari ◽  
J(Yiannis) Vardaxoglou ◽  
William Whittow
Keyword(s):  
Critical Review ◽  
Frequency Selective Surfaces ◽  
Low Loss ◽  
Naturally Occurring ◽  
Manufacturing Complexity ◽  
Non Linear ◽  
Phase Discontinuity ◽  
Wavefront Shaping ◽  
Salient Features ◽  
Planar Metamaterials

This paper is a critical review of metasurfaces, which are planar metamaterials. Metamaterials offer bespoke electromagnetic applications and novel properties which are not found in naturally occurring materials. However, owing to their 3D-nature and resonant characteristics, they suffer from manufacturing complexity, losses and are highly dispersive. The 2-dimensional nature of metasurfaces allows ease of fabrication and integration into devices. The phase discontinuity across the metasurface offers anomalous refraction, thereby conserving the good metamaterial properties while still offering the low-loss characteristics. The paper discusses salient features and applications of metasurfaces; wavefront shaping; phase jumps; non-linear metasurfaces; and their use as frequency selective surfaces (FSS).

Low Loss, Low OH, Highly Non-Linear Holey Fiber for Raman Amplification

2006 ◽  
Author(s):  
A. Monteville ◽  
D. Landais ◽  
O. LeGoffic ◽  
D. Tregoat ◽  
N.J. Traynor ◽  
...  
Keyword(s):  
Raman Amplification ◽  
Low Loss ◽  
Holey Fiber ◽  
Non Linear

scholarly journals Xanthone Glucosides: Isolation, Bioactivity and Synthesis

Molecules ◽  
2021 ◽  
Vol 26 (18) ◽  
pp. 5575
Author(s):  
Qing Huang ◽  
Youyi Wang ◽  
Huaimo Wu ◽  
Man Yuan ◽  
Changwu Zheng ◽  
...  
Keyword(s):  
Secondary Metabolites ◽  
Pharmacological Activity ◽  
Critical Review ◽  
Literature Survey ◽  
Diverse Range ◽  
Naturally Occurring ◽  
Anti Oxidant ◽  
As Solubility ◽  
Improved Characteristics

Xanthones are secondary metabolites found in plants, fungi, lichens, and bacteria from a variety of families and genera, with the majority found in the Gentianaceae, Polygalaceae, and Clusiaceae. They have a diverse range of bioactivities, including anti-oxidant, anti-bacterial, anti-malarial, anti-tuberculosis, and cytotoxic properties. Xanthone glucosides are a significant branch of xanthones. After glycosylation, xanthones may have improved characteristics (such as solubility and pharmacological activity). Currently, no critical review of xanthone glucosides has been published. A literature survey including reports of naturally occurring xanthone glucosides is included in this review. The isolation, structure, bioactivity, and synthesis of these compounds were all explored in depth.

scholarly journals Low loss microstructured chalcogenide fibers for large non linear effects at 1995 nm

2010 ◽  
Vol 18 (25) ◽  
pp. 26647 ◽  
Author(s):  
J. Troles ◽  
Q Coulombier ◽  
G. Canat ◽  
M. Duhant ◽  
W. Renard ◽  
...  
Keyword(s):  
Low Loss ◽  
Non Linear ◽  
Linear Effects

scholarly journals Non-linear label-free imaging through a multimode graded index optical fibre

2020 ◽  
Vol 238 ◽  
pp. 04006
Author(s):  
Angel Cifuentes ◽  
Johanna Trägårdh ◽  
Tomáš Pikálek ◽  
Mojmír Šerý ◽  
Denis Akimov ◽  
...  
Keyword(s):  
Laser Scanning ◽  
Second Harmonic ◽  
Speckle Pattern ◽  
Label Free ◽  
Graded Index ◽  
Non Linear ◽  
Wavefront Shaping ◽  
Microscopy Techniques ◽  
Anti Stokes ◽  
Made In

In recent years, great advances have been made in developing minimal footprint micro-endoscopes using multimode optical fibres (MMF) [1]. By employing wavefront shaping methods the seemingly random speckle pattern resulting from the guiding of coherent light through an MMF can be formed into a diffraction limited spot. This enables the implementation of multiple laser scanning techniques. In this work we show that this approach can be employed to realize label-free non-linear microscopy techniques such as coherent anti-Stokes Raman scattering (CARS) and second harmonic generation (SHG). Backscattered light makes epi-detection possible even though these processes preferably emit light in the direction of beam propagation [2].

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