Optical Properties of Sputtered Silver Granular Films

2005 ◽  
Vol 480-481 ◽  
pp. 287-292 ◽  
Author(s):  
S.E. Paje ◽  
F. Teran ◽  
J.M. Riveiro ◽  
J. Llopis ◽  
M.A. García ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Optical Properties ◽  
Optical Absorption ◽  
Surface Morphology ◽  
Silver Clusters ◽  
Plasmon Excitation ◽  
Granular Films ◽  
Silver Films ◽  
Atomic Force ◽  
Atomic Force Micrographs

In this research we study optical absorption and morphology of silver films prepared with a sputtering method. Silver granular films are obtained on a glass substrate for films with thickness smaller than about 60 Å. Superficial silver clusters of around 100 nm in diameter are clearly seen in the atomic force micrographs. The absorption of these samples are characterized by plasmon excitation in the 450-650 nm spectral range, which differs from the known excitation of silver nanoparticles fabricated by different techniques. The optical absorption of silver granular films depend on sputtering conditions like substrate temperature or deposition rate and correlates with the surface morphology.

Optical properties of unprotected and protected sputtered silver films: Surface morphology vs. UV/VIS reflectance

2014 ◽  
Vol 3 (1) ◽  
Author(s):  
Paul Johannes Jobst ◽  
Olaf Stenzel ◽  
Mark Schürmann ◽  
Norbert Modsching ◽  
Sergiy Yulin ◽  
...  
Keyword(s):  
Optical Properties ◽  
Surface Morphology ◽  
Normal Incidence ◽  
Interface Layer ◽  
Strong Correlations ◽  
Flash Evaporation ◽  
Silver Surface ◽  
Silver Films ◽  
Model Calculations ◽  
Time Period

AbstractThe optical properties of opaque sputtered silver films are investigated and related to their surface morphology. As reference, an evaporated sample produced by thermal flash evaporation has been studied, too. Standard optical and electrical characterizations as well as scanning electron microscopy (SEM) and X-ray reflectometry have been carried out with unprotected silver films directly after deposition and reveal strong correlations between the corresponding characterization results. The aging behavior of the normal incidence reflectance has been studied over a time period of 36 weeks. Protected silver mirrors have been prepared by sputtering using silica and alumina as the protective coating. It is shown by model calculations that the main spectral features occurring in the reflectance spectra of as-deposited unprotected coatings, unprotected coatings after aging, and protected coatings can be reproduced assuming a rough silver surface covered by a corresponding ultrathin absorbing interface layer or overlayer.

Optical Properties and Internal Photoemission in Epitaxial Composites of CoSi2 Particles in Silicon

1991 ◽  
Vol 220 ◽  
Author(s):  
J. R. Jimenez ◽  
L. J. Schowalter ◽  
R. W. Fathauer
Keyword(s):  
Dielectric Constant ◽  
Optical Properties ◽  
Optical Absorption ◽  
Metal Particles ◽  
Surface Plasma ◽  
Plasmon Excitation ◽  
Surface Plasma Resonance ◽  
Internal Photoemission ◽  
Surface Plasmon Excitation ◽  
State Charge

ABSTRACTAn analysis of optical absorption and internal photoemission in epitaxial CoSi2 particles buried in silicon is carried out. The optical absorption is dominated by the well-known surface plasma resonance, and calculations of the surface plasma frequencies, using the previously measured dielectric constant of CoSi2, agree well with experiment. A model for the photoemission yield is presented which includes the effects of the surface plasmon excitation and decay. The model can reproduce the observed features of the yield in photoresponse experiments. A model for the replenishment of photoemitted carriers is also presented, in which the metal particles acquire a small steady-state charge under illumination.

scholarly journals Clustering in thin silver films upon heating

2021 ◽  
Vol 2103 (1) ◽  
pp. 012109
Author(s):  
V A Kazakov ◽  
A G Razina ◽  
A V Smirnov ◽  
A I Vasilev
Keyword(s):  
Composite Structures ◽  
Silver Clusters ◽  
Continuous Film ◽  
Silver Films ◽  
Force Microscopy ◽  
Atomic Force ◽  
Visible Wavelength Range ◽  
Individual Nanoparticles ◽  
Optical Spectrophotometry ◽  
Kinetics Of

Abstract The kinetics of the formation of silver clusters Ag from nanoscale continuous films of Ag on the surface of silicate glass and composite structures from films of Ag with carbon in the form of a continuous film and individual nanoparticles upon annealing in air at temperatures up to 670K is investigated. In the course of the work, the dependences of the surface morphology of silver clusters and absorption spectra in the visible wavelength range were obtained by the methods of atomic force microscopy and optical spectrophotometry.

scholarly journals Low Energy Optical Excitations as an Indicator of Structural Changes Initiated at the Termini of Amyloid Proteins

2018 ◽  
Author(s):  
KwangHyok Jong ◽  
Yavar T. Azar ◽  
Luca Grisanti ◽  
Amberley D. Stephens ◽  
Saul T.E. Jones ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Optical Properties ◽  
Amino Acid ◽  
Optical Absorption ◽  
Structural Changes ◽  
Low Energy ◽  
Force Microscopy ◽  
Atomic Force ◽  
N Terminus

<div>We combine absorption and fluorscence spectroscopy experiments and theoretical modeling to specifically examine the role of termini interactions on the optical properties.</div><div><div>Optical absorption and fluorescence is measured for a six-chain amino acid 2Y3J (AIIGLM) which forms a segment of the full amyloid beta 1-40. In order to explore the sensitivity of the optical properties to the termini interactions, the experiments were repeated by acetylating the N-terminus.</div><div>Although atomic force microscopy experiments indicate the formation of some form of fibrilar or crystal aggregates in both systems, the optical properties are strikingly different - acetylation significantly reduces optical activity between 280-350 nm.</div></div>

scholarly journals Low Energy Optical Excitations as an Indicator of Structural Changes Initiated at the Termini of Amyloid Proteins

2018 ◽  
Author(s):  
KwangHyok Jong ◽  
Yavar T. Azar ◽  
Luca Grisanti ◽  
Amberley D. Stephens ◽  
Saul T.E. Jones ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Optical Properties ◽  
Amino Acid ◽  
Optical Absorption ◽  
Structural Changes ◽  
Low Energy ◽  
Force Microscopy ◽  
Atomic Force ◽  
N Terminus

<div>We combine absorption and fluorscence spectroscopy experiments and theoretical modeling to specifically examine the role of termini interactions on the optical properties.</div><div><div>Optical absorption and fluorescence is measured for a six-chain amino acid 2Y3J (AIIGLM) which forms a segment of the full amyloid beta 1-40. In order to explore the sensitivity of the optical properties to the termini interactions, the experiments were repeated by acetylating the N-terminus.</div><div>Although atomic force microscopy experiments indicate the formation of some form of fibrilar or crystal aggregates in both systems, the optical properties are strikingly different - acetylation significantly reduces optical activity between 280-350 nm.</div></div>

Synthesis of Silver Nanoparticles by Sparking Process

2016 ◽  
Vol 675-676 ◽  
pp. 73-76
Author(s):  
Thanut Jintakosol
Keyword(s):  
Raman Spectroscopy ◽  
Silver Nanoparticles ◽  
Optical Properties ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Low Cost ◽  
Ag Nps ◽  
Spherical Structure ◽  
Atomic Force ◽  
Scanning Electron

Silver nanoparticles (Ag NPs) were synthesized by sparking process. The NPs were continuously deposited onto the substrate by varying the number of sparking cycles ranging from 100-200 and deposited on the glass substrate and annealing at 250-500 °C for 1 hr. The effect of Ag NPs on their structure and optical characteristics were investigated. The optical properties of the NPs have been studied from by Raman spectroscopy and UV-vis spectrophotometer. The morphology of Ag NP was characterized by Scanning Electron Microscope (SEM) and Atomic force microscope (AFM). The results have shown mainly spherical structure of Ag NPs in diameter ranging from 80-100 nm. This study demonstrated that the Ag NPs can be synthesized by sparking process and simply with low cost.

Effects of Surface Treatments on Optical Properties of GaN

2006 ◽  
Vol 955 ◽  
Author(s):  
Gakuyo Fujimoto ◽  
Katsushi Fujii ◽  
Tsutomu Minegishi ◽  
Hiroki Goto ◽  
Takenari Goto ◽  
...  
Keyword(s):  
Optical Properties ◽  
Electron Diffraction ◽  
Low Temperature ◽  
Surface Morphology ◽  
Atomic Force Microscope ◽  
Oxide Layer ◽  
High Energy ◽  
High Energy Electron ◽  
Optical Reflection ◽  
Atomic Force

ABSTRACTRemoving artificial oxide layer is important for fabrication process of semiconductor devices. We employed photoluminescence for optical, reflection high energy electron diffraction, atomic force microscope, and Nomarski microscope for surface analysis. We found that it is more difficult to remove the oxide layer made by O-plasma such as in O-plasma asher than that of native one. Our result reached that HF etching is effective for removal of the artificial oxide layer without changing surface morphology. In addition, (NH4)2Sx treatment after HF etching reduces donor bound exciton drastically which is dominant luminescence near the band edge at low temperature.

Optical Properties and Surface Morphology of Thin Silver Films Deposited by Thermal Evaporation

2015 ◽  
Vol 32 (7) ◽  
pp. 077802 ◽  
Author(s):  
Ming Zhou ◽  
Yao-Peng Li ◽  
Sheng Zhou ◽  
Ding-Quan Liu
Keyword(s):  
Optical Properties ◽  
Surface Morphology ◽  
Thermal Evaporation ◽  
Silver Films

scholarly journals Structural and optical properties of Co and Ni doped ZnO thin films prepared by RF magnetron sputtering

2017 ◽  
Vol 18 (3) ◽  
pp. 302-308 ◽  
Author(s):  
I.D. Stolyarchuk ◽  
G.I. Kleto ◽  
A. Dziedzic
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Optical Absorption ◽  
Surface Morphology ◽  
Band Gap ◽  
Energy Band ◽  
Zno Thin Films ◽  
Optical Absorption Spectra ◽  
Energy Band Gap ◽  
Structural And Optical Properties

We have reported the effect of Co and Ni doping on structural and optical properties of ZnO thin films prepared by RF reactive sputtering technique. The composite targets were formed by mixing and pressing of ZnO, Mn3O4, CoO and NiO powders. The thin films were deposited on sapphire, quartz and glass substrates. The structure study confirms the formation of the hexagonal wurtzite ZnO without any secondary phase in transition metal (Co, Ni) - doped samples. Cross-sectional TEM images of all studied samples show a denseand uniformly textured structure composed of column-like structure along the growth direction. The surface morphology of the thin films was studied using atomic force microscopy (AFM). Different surface morphology (AFM) images were obtained depending on the film composition and growth conditions. Optical absorption spectra suggest of substitution Zn2+ ions in ZnO lattice by transition metal atoms. The shift of the absorption edge due to decrease the energy band gap with increasing cobalt content and complex dependence of the energy band gap on content of nickel was observed in optical absorption spectra of the studied films. The room temperature photoluminescence peaks are attributed to near band gap emission and vacancy or defect states.

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