Search results for "Physics::Optics"
showing 10 items of 1958 documents
Multiplexing of encrypted data using fractal masks
2012
In this Letter, we present to the best of our knowledge a new all-optical technique for multiple-image encryption and multiplexing, based on fractal encrypting masks. The optical architecture is a joint transform correlator. The multiplexed encrypted data are stored in a photorefractive crystal. The fractal parameters of the key can be easily tuned to lead to a multiplexing operation without cross talk effects. Experimental results that support the potential of the method are presented.
Generation of defects in amorphous SiO(2) assisted by two-step absorption on impurity sites.
2011
Generation of the Si dangling bond defect in amorphous SiO(2) (E' centre) induced by tunable pulsed UV laser radiation was investigated by in situ optical absorption measurements. The defect generation efficiency peaks when the photon energy equals ∼5.1 eV, it depends quadratically on laser intensity and is correlated with the native linear absorption due to Ge impurities. We propose a model in which the generation of E' is assisted by a two-step absorption process occurring on Ge impurity sites.
Study of the influence of dynamics variables on the growth of silica nanoparticles
2017
In this work 29Si nuclear magnetic resonance (NMR) spectroscopy and Fourier transform infrared spectroscopy (FTIR) were used to analyze in situ the formation process of silica nanoparticles from ba...
Gold Nanoparticle Growth Monitored in situ Using a Novel Fast Optical Single-Particle Spectroscopy Method
2007
Size- and shape-dependent optical properties of gold nanorods allow monitoring their growth using a novel fast single-particle spectroscopy (fastSPS) method. FastSPS uses a spatially addressable electronic shutter based on a liquid crystal device to investigate particles randomly deposited on a substrate, orders of magnitude faster than other techniques. We use fastSPS to observe nanoparticle growth in situ on a single-particle level and extract quantitative data on nanoparticle growth.
"Table 1" of "Test of low-energy theorems for p(gamma(pol.),pi0)p in the threshold region."
1995
Polarized photon beam.
"Table 1" of "Spin asymmetries A(1) and structure functions g1 of the proton and the deuteron from polarized high energy muon scattering."
1998
The virtual photon proton asymmetries.
"Table 32" of "Search for photonic signatures of gauge-mediated supersymmetry in 8 TeV $pp$ collisions with the ATLAS detector"
2015
The best signal region used for each signal point in the photon+j analysis.
"Table 2" of "Spin asymmetries A(1) and structure functions g1 of the proton and the deuteron from polarized high energy muon scattering."
1998
The virtual photon deuteron asymmetries.
"Table 1" of "Measurement of the isolated photon cross section in p anti-p collisions at s**(1/2) = 1.96-TeV"
2005
Measured differential cross section for the production of isolated photons.
"Table 2" of "A study of the associated production of photons and b-quark jets in p-pbar collisions at sqrt{s} = 1.96 TeV"
2014
b + photon total cross section for photon ET > 20 GeV.