Surface Plasmon Resonance in Nanocrystalline Gold–Copper Alloy Films

2007 ◽  
Vol 7 (12) ◽  
pp. 4486-4493 ◽  
Author(s):  
S. Hussain ◽  
Subhadeep Datta ◽  
R. K. Roy ◽  
A. K. Pal
Keyword(s):  
Surface Plasmon ◽  
Peak Position ◽  
Fused Silica ◽  
Linear Variation ◽  
The Core ◽  
Nanocrystalline Thin Film ◽  
Plasmon Peak ◽  
Superlattice Structures ◽  
Film Form ◽  
Absorbance Spectra

Nanocrystalline Aux Cu1–x films were synthesized by depositing Cu/Au/Cu multilayer in nanocrystalline thin film form with requisite thickness of individual layers onto fused silica substrates by high pressure sputtering technique. The absorbance spectra showed only one surface plasmon peak for all the compositions with the exception that the peak position did not indicate gradual shift as gold concentration was increased. Peak position for the two compositions corresponding to the two superlattice structures, AuCu3 and AuCu, deviated significantly from linear variation. The experimental results have been discussed in light of the existing Mie theory and the Core-shell model.

QUENCHING OF SURFACE PLASMON MODES IN COLLOIDAL SILVER NANOPARTICLES ON OZONIZATION

NANO ◽  
2006 ◽  
Vol 01 (03) ◽  
pp. 229-234
Author(s):  
R. K. RAKSHIT ◽  
SAYANTANI BHATTACHARYA ◽  
R. C. BUDHANI
Keyword(s):  
Silver Nanoparticles ◽  
Laser Ablation ◽  
Surface Plasmon ◽  
Effective Medium Theory ◽  
Plasmon Mode ◽  
Colloidal Silver ◽  
Medium Theory ◽  
Bright Yellow ◽  
Plasmon Peak ◽  
Colloidal Silver Nanoparticles

Oxidation characteristics of colloidal silver nanoparticles produced by pulsed laser ablation in pure and chemically treated water are studied as a function of the degree of ozonization. The bright yellow colloidal solution of silver characterized by a sharp surface plasmon mode at ~400 nm, becomes colorless in the initial stages of O 3 flow, and then acquires a brown hue with a broad plasmon peak centered at ~440 to ~450 nm on further ozonization. The solution again becomes colorless in a few days once the O 3 flow is stopped. We present a qualitative model for the reaction dynamics and analyze the optical absorption in the framework of an effective medium theory. The aqueous phase laser ablation chemistry described here provides a unique means to produce ionic silver for enhanced antimicrobial effects.

Plasmon Line Widths of Single Silver Nanoprisms as a Function of Particle Size and Plasmon Peak Position

2007 ◽  
Vol 111 (51) ◽  
pp. 18906-18911 ◽  
Author(s):  
Keiko Munechika ◽  
Jessica M. Smith ◽  
Yeechi Chen ◽  
David S. Ginger
Keyword(s):  
Particle Size ◽  
Peak Position ◽  
Silver Nanoprisms ◽  
Plasmon Peak ◽  
Line Widths

scholarly journals Tuning the surface plasmon resonance in gold nanocrystals with single layer carbon nitride

RSC Advances ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 444-449 ◽  
Author(s):  
O. Stroyuk ◽  
A. Raevskaya ◽  
G. Grodzyuk ◽  
N. Andriushina ◽  
M. Skoryk ◽  
...  
Keyword(s):  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Carbon Nitride ◽  
Single Layer ◽  
Peak Position ◽  
Surface Plasmon Resonance Peak ◽  
Plasmon Resonance Peak ◽  
Gold Nanocrystals ◽  
Carbon Nitride Nanosheets

Interaction of forming Au nanocrystals with single-layer carbon nitride nanosheets allows the surface plasmon resonance peak position of gold/carbon nitride composites to be tuned in a range of 520–610 nm.

Microstructure and Performance of Fused Silica-Based Ceramic Core Reinforced by Mullite Fiber

2016 ◽  
Vol 848 ◽  
pp. 228-232
Author(s):  
Xin Li ◽  
Jian Sheng Yao ◽  
Xiao Guang Liu ◽  
Hong Na Fan ◽  
Shu Xin Niu
Keyword(s):  
Flexural Strength ◽  
Creep Test ◽  
Casting Process ◽  
Fused Silica ◽  
Strength Test ◽  
Ceramic Core ◽  
The Core ◽  
Mullite Fiber ◽  
And Performance ◽  
Microstructure And Performance

Fused silica-based ceramics are often used as sacrificial cores in investment castings to produce hollow, precise, and complex-shaped blades. In this work, the content of mullite fiber and its effects on mechanical and dimension behavior of silica-based ceramic cores were investigated. In order to simulate the single crystal blades casting process, the sintered samples were also heated up to 1540°C and kept for 0.5 h. Flexural strength test at 1540°Cwas carried out for the samples. The shrinkage, creep behavior and erode behavior were characterized. The results showed that in the premise of maintaining strength of materials, mullite fiber could decrease significantly the shrinkage. Many gains appeared on the surface of fiber after creep test of the core samples at 1540°C.

Nanostructuring of thin Au films by means of short UV laser pulses

2011 ◽  
Vol 19 (3) ◽  
Author(s):  
K. Grochowska ◽  
N. Nedyalkov ◽  
P. Atanasov ◽  
G. Śliwiński
Keyword(s):  
Size Distribution ◽  
Glass Substrate ◽  
Laser Pulses ◽  
Resonant Absorption ◽  
Peak Position ◽  
Fused Silica ◽  
Au Nanoparticle ◽  
Raman Signal ◽  
Particle Removal ◽  
Preparation Conditions

AbstractThe particle size distribution, morphology and optical properties of the Au nanoparticle (NP) structures for surface enhanced Raman signal (SERS) application are investigated in dependence on their preparation conditions. The structures are produced from relatively thin Au films (10–20 nm) sputtered on fused silica glass substrate and irradiated with several pulses (6 ns) of laser radiation at 266 nm and at fluencies in the range of 160–412 mJ/cm2. The SEM inspection reveals nearly homogeneously distributed, spherical gold particles. Their initial size distribution of the range of 20–60 nm broadens towards larger particle diameters with prolonged irradiation. This is accompanied by an increase in the uncovered surface of the glass substrate and no particle removal is observed. In the absorption profiles of the nanostructures, the broad peak centred at 546 nm is ascribed to resonant absorption of surface plasmons (SPR). The peak position, halfwidth and intensity depend on the shape, size and size distribution of the nanostructured particles in agreement with literature. From peak intensities of the Raman spectra recorded for Rhodamine 6G in the range of 300–1800 cm−1, the relative signal enhancement by factor between 20 and 603 for individual peaks is estimated. The results confirm that the obtained structures can be applied for SERS measurements and sensing.

scholarly journals Fused silica photonic crystal fiber with heavily germanium doped microinclusion in the core dedicated to couple, guide and control LP02 higher-order mode

2018 ◽  
Vol 26 (17) ◽  
pp. 21939 ◽  
Author(s):  
Tomasz Stefaniuk ◽  
Grzegorz Stępniewski ◽  
Dariusz Pysz ◽  
Ryszard Stępień ◽  
Ryszard Buczyński
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Higher Order ◽  
Fused Silica ◽  
Order Mode ◽  
Crystal Fiber ◽  
The Core ◽  
And Control ◽  
Higher Order Mode

scholarly journals Anti-Resonant Hollow Core Fibers with Modified Shape of the Core for the Better Optical Performance in the Visible Spectral Region—A Numerical Study

Polymers ◽  
2018 ◽  
Vol 10 (8) ◽  
pp. 899 ◽  
Author(s):  
Hanna Stawska ◽  
Maciej Popenda ◽  
Elżbieta Bereś-Pawlik
Keyword(s):  
Optical Fibers ◽  
Wavelength Range ◽  
Numerical Study ◽  
Visible Spectral Region ◽  
Fused Silica ◽  
Confinement Loss ◽  
Hollow Core ◽  
The Core ◽  
Bending Loss ◽  
Bending Radius

In this paper, we present numerical studies of several different structures of anti-resonant, hollow core optical fibers. The cladding of these fibers is based on the Kagomé lattice concept, with some of the core-surrounding lattice cells removed. This modification, by creating additional, glass-free regions around the core, results in a significant improvement of some important optical fiber parameters, such as confinement loss (CL), bending loss (BL), and dispersion parameter (D). According to the conducted simulations (with fused silica glass being the structure’s material), CL were reduced from ~0.36 dB/m to ~0.16 dB/m (at 760 nm wavelength) in case of the structure with removed cells, and did not exceed the value of 1 dB/m across the 700–850 nm wavelength range. Additionally, proposed structure exhibits a remarkably low value of D—from 1.5 to 2.5 ps/(nm × km) at the 700–800 nm wavelength range, while the BL were estimated to be below 0.25 dB/m for bending radius of ~1.5 cm. CL and D were simulated, additionally, for structures made of acrylic glass polymethylmethacrylate, (PMMA), with similarly good results—DPMMA ∊ [2, 4] ps/(nm × km) and CLPMMA ≈ 0.13 dB/m (down from 0.41 dB/m), for the same spectral regions (700–800 nm bandwidth for D, and 760 nm wavelength for CL).

scholarly journals Colloidal Metal Oxide Nanoparticles Prepared by Laser Ablation Technique and Their Antibacterial Test

2019 ◽  
Vol 3 (1) ◽  
pp. 25 ◽  
Author(s):  
Johan Duque ◽  
Brayan Madrigal ◽  
Henry Riascos ◽  
Yenny Avila
Keyword(s):  
Surface Plasmon Resonance ◽  
Laser Ablation ◽  
Metal Oxide ◽  
Band Gap ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Ablation Technique ◽  
532 Nm ◽  
Absorbance Spectra ◽  
Laser Ablation Technique

In this article we report the production of metal oxide (TiFe2O4, ZnFe2O4) nanoparticles by pulsed laser ablation technique in a liquid environment. We used nanosecond Nd: YAG laser systems working at 532 nm and 1064 nm of wavelength and the energy of the laser beam was kept constant at 80 mJ. Absorbance spectra, surface plasmon resonance, optical band-gap, and nanoparticle morphology were investigated using ultraviolet-visible (UV-Vis) spectroscopy, Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). Changing the wavelength of the laser for growth, nanoparticles showed shift between the absorbance and surface plasmon resonance peaks in their UV-Vis spectra, which implies that the optical properties of the colloid nanoparticles depend on laser parameters. This was confirmed with the variation of the band gap energy. Furthermore, redshift for the absorbance peak was observed for samples as-grown at 532 nm around 150 nm as a function of time preparation. Conversely, for the samples as-grown at 1064 nm there was no shift in the absorbance spectra, which could be due to agglomeration and formation of larger particles. The characterization results showed appropriate plasmonic photo-catalysts properties of the particles, hence the photoactivation of the nanoparticles was examined on antibacterial effect using colonies of Staphylococcus aureus and Escherichia coli.

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