scholarly journals Black Metals: Optical Absorbers

Micromachines ◽  
2020 ◽  
Vol 11 (3) ◽  
pp. 256 ◽  
Author(s):  
Stefan Lundgaard ◽  
Soon Hock Ng ◽  
Yoshiaki Nishijima ◽  
Michael Mazilu ◽  
Saulius Juodkazis
Keyword(s):  
Thin Film ◽  
Spectral Region ◽  
Impedance Matching ◽  
Soda Lime ◽  
Sio2 Thin Film ◽  
Infra Red ◽  
Nm Range ◽  
Transmission And Reflection

We demonstrate a concept and fabrication of lithography-free layered metal-SiO2 thin-film structures which have reduced reflectivity (black appearance), to as low as 0.9%, with 4.9% broadband reflectance (8.9% for soda lime) in the 500–1400 nm range. The multi-layered (four layers) thin-film metamaterial is designed so that optical impedance matching produces minimal reflectance and transmittance within the visible and infra-red (IR) spectral region for a range of incident angles. The structure has enhanced absorbance and is easily tuned for reduced minimal transmission and reflection. This approach should allow for novel anti-reflection surfaces by impedance matching to be realized.

scholarly journals Plasmon-Enhanced Sunlight Harvesting in Thin-Film Solar Cell by Randomly Distributed Nanoparticle Array

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1380
Author(s):  
Marwa M. Tharwat ◽  
Ashwag Almalki ◽  
Amr M. Mahros
Keyword(s):  
Thin Film ◽  
Solar Cells ◽  
Solar Cell ◽  
Near Infrared ◽  
Structural Parameters ◽  
Visible Region ◽  
Nanoparticle Array ◽  
Solar Energy Harvesting ◽  
Infra Red ◽  
Crucial Parameter

In this paper, a randomly distributed plasmonic aluminum nanoparticle array is introduced on the top surface of conventional GaAs thin-film solar cells to improve sunlight harvesting. The performance of such photovoltaic structures is determined through monitoring the modification of its absorbance due to changing its structural parameters. A single Al nanoparticle array is integrated over the antireflective layer to boost the absorption spectra in both visible and near-infra-red regimes. Furthermore, the planar density of the plasmonic layer is presented as a crucial parameter in studying and investigating the performance of the solar cells. Then, we have introduced a double Al nanoparticle array as an imperfection from the regular uniform single array as it has different size particles and various spatial distributions. The comparison of performances was established using the enhancement percentage in the absorption. The findings illustrate that the structural parameters of the reported solar cell, especially the planar density of the plasmonic layer, have significant impacts on tuning solar energy harvesting. Additionally, increasing the plasmonic planar density enhances the absorption in the visible region. On the other hand, the absorption in the near-infrared regime becomes worse, and vice versa.

scholarly journals Experimental Study on the Thickness-Dependent Hardness of SiO2 Thin Films Using Nanoindentation

Coatings ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 23
Author(s):  
Weiguang Zhang ◽  
Jijun Li ◽  
Yongming Xing ◽  
Xiaomeng Nie ◽  
Fengchao Lang ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Grain Size ◽  
Integrated Circuits ◽  
Film Thickness ◽  
Depth Range ◽  
Micro Electro Mechanical Systems ◽  
Si Substrates ◽  
Sio2 Thin Film ◽  
Average Grain Size

SiO2 thin films are widely used in micro-electro-mechanical systems, integrated circuits and optical thin film devices. Tremendous efforts have been devoted to studying the preparation technology and optical properties of SiO2 thin films, but little attention has been paid to their mechanical properties. Herein, the surface morphology of the 500-nm-thick, 1000-nm-thick and 2000-nm-thick SiO2 thin films on the Si substrates was observed by atomic force microscopy. The hardnesses of the three SiO2 thin films with different thicknesses were investigated by nanoindentation technique, and the dependence of the hardness of the SiO2 thin film with its thickness was analyzed. The results showed that the average grain size of SiO2 thin film increased with increasing film thickness. For the three SiO2 thin films with different thicknesses, the same relative penetration depth range of ~0.4–0.5 existed, above which the intrinsic hardness without substrate influence can be determined. The average intrinsic hardness of the SiO2 thin film decreased with the increasing film thickness and average grain size, which showed the similar trend with the Hall-Petch type relationship.

Highly reflective thin film coatings for high power applications of micro scanning mirrors in the NIR-VIS-UV spectral region

2005 ◽  
Author(s):  
Thilo Sandner ◽  
Jan Uwe Schmidt ◽  
Harald Schenk ◽  
Hubert Lakner ◽  
Minghong Yang ◽  
...  
Keyword(s):  
Thin Film ◽  
High Power ◽  
Spectral Region ◽  
Film Coatings ◽  
Thin Film Coatings

TPX, a new material for optical components in the far infra-red spectral region

1969 ◽  
Vol 9 (1) ◽  
pp. 31-33 ◽  
Author(s):  
G.W. Chantry ◽  
Helen M. Evans ◽  
J.W. Fleming ◽  
H.A. Gebbie
Keyword(s):  
Spectral Region ◽  
Optical Components ◽  
Infra Red ◽  
New Material

scholarly journals Suppression of insertion loss by slit patterning of a magnetic film in a CoFeB/polyimide hybrid thin-film coplanar line for a rf impedance matching device

2006 ◽  
Vol 99 (8) ◽  
pp. 08P508 ◽  
Author(s):  
Hidetoshi Nakayama ◽  
Tomohiro Yamamoto ◽  
Yuko Mizoguchi ◽  
Masahiro Nakazawa ◽  
Toshiro Sato ◽  
...  
Keyword(s):  
Thin Film ◽  
Insertion Loss ◽  
Impedance Matching ◽  
Magnetic Film ◽  
Hybrid Thin Film ◽  
Coplanar Line

scholarly journals Continuously tuning the impedance matching at the broadband terahertz frequency range in VO2 thin film

2018 ◽  
Vol 9 (1) ◽  
pp. 315 ◽  
Author(s):  
Hong-fu Zhu ◽  
Jiang Li ◽  
Sen-cheng Zhong ◽  
Liang-hui Du ◽  
Qi-wu Shi ◽  
...  
Keyword(s):  
Thin Film ◽  
Impedance Matching ◽  
Terahertz Frequency ◽  
Frequency Range ◽  
Terahertz Frequency Range ◽  
Broadband Terahertz

scholarly journals The Infra-Red Transmission and Reflection of a Number of the Aniline Dyes

1915 ◽  
Vol 5 (5) ◽  
pp. 349-358 ◽  
Author(s):  
J. B. Johnson ◽  
B. J. Spence
Keyword(s):  
Infra Red ◽  
Aniline Dyes ◽  
Transmission And Reflection

Light scattering in heavy-metal fluoride glasses in infra-red spectral region

1986 ◽  
Vol 22 (3) ◽  
pp. 117 ◽  
Author(s):  
D.C. Tran ◽  
K.H. Levin ◽  
R.J. Ginther ◽  
G.H. Sigel ◽  
A.J. Bruce
Keyword(s):  
Heavy Metal ◽  
Light Scattering ◽  
Spectral Region ◽  
Metal Fluoride ◽  
Fluoride Glasses ◽  
Infra Red ◽  
Heavy Metal Fluoride ◽  
Heavy Metal Fluoride Glasses
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