Surface roughness and substrate induced symmetry-breaking: influence on the plasmonic properties of aluminum nanostructure arrays

Nanoscale ◽  
2020 ◽  
Author(s):  
Feifei ZHANG ◽  
Jérôme Plain ◽  
Davy Gerard ◽  
Jérôme Martin
Keyword(s):  
Surface Roughness ◽  
Optical Properties ◽  
Symmetry Breaking ◽  
Surface Topography ◽  
Metallic Nanoparticles ◽  
Far Field ◽  
Al Nanoparticles ◽  
Nanostructure Arrays

The surface topography is known to play an important role on the near- and far- field optical properties of metallic nanoparticles. In particular, aluminum (Al) nanoparticles are commonly fabricated through...

Manipulation of Plasmon Dephasing Time in Nanostructure Arrays Via the Far-Field Coupling

Plasmonics ◽  
2021 ◽  
Author(s):  
Yang Xu ◽  
Yulu Qin ◽  
Boyu Ji ◽  
Xiaowei Song ◽  
Jingquan Lin
Keyword(s):  
Far Field ◽  
Dephasing Time ◽  
Field Coupling ◽  
Nanostructure Arrays

scholarly journals Influence of surface roughness on the optical properties of plasmonic nanoparticles

2011 ◽  
Vol 83 (8) ◽  
Author(s):  
Andreas Trügler ◽  
Jean-Claude Tinguely ◽  
Joachim R. Krenn ◽  
Andreas Hohenau ◽  
Ulrich Hohenester
Keyword(s):  
Surface Roughness ◽  
Optical Properties ◽  
Plasmonic Nanoparticles

Generation mechanism modeling of surface topography in tangential ultrasonic vibration-assisted grinding with green silicon carbide abrasive wheel

2021 ◽  
pp. 095440542110406
Author(s):  
Yutong Qiu ◽  
Jingfei Yin ◽  
Yang Cao ◽  
Wenfeng Ding
Keyword(s):  
Surface Roughness ◽  
Surface Topography ◽  
Ultrasonic Vibration ◽  
Generation Mechanism ◽  
Surface Generation ◽  
Depth Of Cut ◽  
Abrasive Wheel ◽  
Grinding Parameters ◽  
Conventional Grinding ◽  
Ultrasonic Vibration Assisted Grinding

Tangential ultrasonic vibration-assisted grinding (TUAG) has a wide prospect in machining difficult-to-machine materials. However, the surface generation mechanism in TUAG is not fully recovered. This study proposes an analytical model of the surface topography produced by TUAG. Based on the model, the surface topography and roughness are predicted and experimentally verified. In addition, the influence of the grinding parameters on the surface topography is analyzed. The predicted surface topography well coincides with experimental measurements, and the prediction error in surface roughness Ra by the proposed model is less than 5%. Compared with conventional grinding, TUAG produces a surface with more uniform scratches and surface roughness Ra was reduced by up to 27% with the proper parameters. However, the improvement of surface roughness in TUAG is weakened when grinding speed or depth of cut increases. Moreover, the influence of the ultrasonic vibration amplitude on the surface roughness is not monotonous. With the grinding parameters selected in this study, TUAG with an ultrasonic amplitude of 7.5 μm produces the minimum surface roughness.

Effect of surface roughness on determination of tissue optical properties obtained by diffusion approximation

2007 ◽  
Vol 46 (17) ◽  
pp. 3649 ◽  
Author(s):  
Meixiu Sun ◽  
Chunping Zhang ◽  
Zhaofeng Hao ◽  
Jianguo Tian
Keyword(s):  
Surface Roughness ◽  
Optical Properties ◽  
Diffusion Approximation ◽  
Tissue Optical Properties ◽  
Effect Of Surface

scholarly journals NEGATIVE REFRACTION AND SUBWAVELENGTH FOCUSING USING PHOTONIC CRYSTALS

2004 ◽  
Vol 18 (25) ◽  
pp. 1275-1291 ◽  
Author(s):  
EKMEL OZBAY ◽  
KAAN GUVEN ◽  
ERTUGRUL CUBUKCU ◽  
KORAY AYDIN ◽  
B. KAMIL ALICI
Keyword(s):  
Optical Properties ◽  
Photonic Crystals ◽  
Negative Refraction ◽  
Numerical Study ◽  
Effective Index ◽  
Index Of Refraction ◽  
Far Field ◽  
Two Dimensional ◽  
Flat Lens ◽  
Effective Index Of Refraction

In this article, we present an experimental and numerical study of novel optical properties of two-dimensional dielectric photonic crystals (PCs) which exhibit negative refraction. We investigate two mechanisms which utilize the band structure of the PC to generate a negative effective index of refraction (n eff <0) and demonstrate the negative refraction experimentally. To the isotropic extend of n eff , different PC slab structures are employed to focus the radiation of a point source. It is shown experimentally that the PC can generate an image of the source with subwavelength resolution in the vicinity of the PC interface. Using a different PC, one can also obtain a far field focusing. In the latter case, we explicitly show the flat lens behavior of the structure. These examples indicate that PC-based lenses can surpass limitations of conventional lenses and lead to novel optics applications.

scholarly journals SiC-TiC nanocomposite for bulk solar absorbers applications: Effect of density and surface roughness on the optical properties

2019 ◽  
Vol 191 ◽  
pp. 199-208 ◽  
Author(s):  
Hélène Aréna ◽  
Moustapha Coulibaly ◽  
Audrey Soum-Glaude ◽  
Alban Jonchère ◽  
Adel Mesbah ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Optical Properties ◽  
Solar Absorbers

Microstructure and Optical Properties of Co Sputter Deposited Si-Al Nanocomposite Thin Films

2000 ◽  
Vol 648 ◽  
Author(s):  
F. Niu ◽  
P.J. Dobson ◽  
B. Cantor
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Optical Absorption ◽  
Absorption Peak ◽  
Al Content ◽  
Al Nanoparticles ◽  
Transmission Electron ◽  
Effective Medium Theories ◽  
Nanocomposite Thin Films ◽  
Sputter Deposited

AbstractNovel Si-Al nanocomposite thin films were made by radio frequency co-sputtering of Si and Al with Al content from 0 at.% to 69 at.%. Microstructure and optical properties of the films were characterised by conventional and high resolution transmission electron microscopyand spectrometry in the wavelength range from 200 to 3000 nm. The film microstructure consisted of Al nanoparticles (2-9 nm) embedded in an amorphous Si-Al matrix. Optical absorption spectra of the films up to 50 at.% Al exhibited a sharp absorption peak below500 nm and relatively low absorption above 500 nm. In addition, the absorption peak shifted towards longer wavelengths and the general absorption above 500 nm increased remarkably as Al content increased. For the Si-69at.%Al films, however, an absorption plateau appeared between 300 nm to 700 nm and a second weak and broad absorption peak appeared at around 900 nm. The results are analysed and compared with the optical absorption predicted by various effective medium theories.

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