CRANFIELD UNIVERSITY Edouard Berrocal MULTIPLE
... ability of the technique to simulate various detection conditions, to differentiate scattering orders and to generate real images of light intensity distributions with high spatial
resolution is demonstrated. The model is used for the real case of planar Mie imaging
through a typical hollow cone wat ...
Inverse Problems In Multiple Light Scattering
... between the optical field and the scattering structure. Thus, because ensemble averaging
inherently destroys specific characteristics of random processes, one can only recover limited
information about the medium.
This dissertation discusses practical means that go beyond ensemble averaging to probe ...
... of a particle approaches one. We must also stress that the logarithmic axis for q is essential as well
as q itself because so much of our world progresses geometrically rather than arithmetically. We
call this procedure of plotting scattered intensity versus q double logarithmically “Q-space analysi ...
Thomas–Fermi Approximation and Basics of the Density Functional
... The Thomas–Fermi model provides reasonably good predictions for atoms. It has
been used before to study potential ﬁelds and charge density in metals and the
equation of states of elements [Feynman et al. (1949)]. However, this method is
considered rather crude for more complex systems because it doe ...
Length Scales Analysis of Wave Scattering from Rough Surfaces
... There are three length scales which scaling behavior between them play role in rough surface scattering, wave-length (λ)
of the incident wave, the roughness (σ) and the correlation length (ξ) of the surface. In this work we show the effective
role of the correlation length in surface scattering. Up ...
Raman Spectroscopy and Imaging of Graphene
... multipeak structure of the 2D band observed for a
stacking of two or more graphene layers is related to
the dispersion of π electrons. As a result, the presence
of a sharp and symmetric 2D band is widely used to
identify SLG . Unfortunately, the differences in the
2D band between two and few laye ...
The Graduate School Eberly College of Science
... an oscillating electric ﬁeld having a frequency of ω. This beam is
detuned by an amount δ from the transition frequency ω0 corresponding to the energy diﬀerence between the two atomic states. . .
The shift of the energy levels of a two level atomic system due to
the presence of an oscillating electr ...
Gravity Gradient Survey with a Mobile Atom
... to be valuable tools for measuring gravitational and inertial effects. In particular,
gravimeters, gradiometers, and gyroscopes based on atom interferometry have all
demonstrated high accuracies competitive with state-of-the-art commercial technology. We describe here the development and operation o ...
Two-Color Two-Photon Excitation Using Femtosecond Laser Pulses
... lifetime imaging, we believe that applications of 2c2p excitation
to microscopy are now within reach. The use of femtosecond
pulses instead of picosecond pulses has several advantages,
although the securing of a temporal overlap is definitely more
challenging the shorter the pulses become. For multi ...
... When light is absorbed its energy is dissipated as thermal energy throughout the absorber
(Elwell & Phil, 1995). Absorption occurs at specific wavelengths, determined by the
molecular properties of the materials in the light path (Jöbsis, 1977; Wray et al., 1988). The
primary light-absorbing compoun ...
Get PDF - OSA Publishing
... The model’s use of a wavelength-independent packing factor [17, 18] is sufficient for describing correlated scattering among the small-sized particles of the fractal distribution that scatter
in the Rayleigh regime. However, the distribution contains important contributions from Mie
scatterers and t ...
Multidimensional Vibrational Spectroscopy of Hydrogen Bonds in
... Pump-probe transients of acetic acid dimers at long delays . . . .
Comparison of pump-probe transients of different isotopomers . .
Pump-probe transients and oscillatory residues . . . . . . . . . . .
Raman spectra of liquid acetic acid . . . . . . . . . . . . . . . . .
Illustration of the calculate ...
The influence of growth temperature on CVD grown graphene on SiC
... Waals forces) onto adhesive tape and then folding and peeling the tape several times to create
thinner layers of graphite, which can at the end lead to a single layer of carbon. But, the
obtained samples differs considerably in size and thickness and it is difficult to produce a
large amount of grap ...
Optical properties scattering - IMT
... surface microstructure and then integrate over the larger scale structure.
If the surface isn t smooth, the scattering is incoherent.
If the surfaces are smooth, then we
use Snell s Law and angle-of-incidenceequals-angle-of-reflection.
A mobile, high-precision atom-interferometer and its
... (GAIN) project has been started to meet this requirement and to provide best possible
accuracy at the same time. It aims to realize an alternative to other types of gravimeters
and to combine important qualities such as high sensitivity and absolute accuracy in one
The GAIN sensor is bas ...
Femtosecond spectroscopy of solid hydrogen - diss.fu
... A two dimensional, spectrally and time resolved Raman technique that is sensitive to
induced anisotropies was introduced on gaseous and liquid para-hydrogen samples, and
subsequently carried to the solid phase. Thereby, rotational alignment dynamics with periods of about 94 fs, corresponding to the ...
Phonons in III-nitride thinﬁlms, bulk and nanowires: a closer look into
... commonly accepted today was given. InN is more difficult to grow than other IIIV nitrides such as GaN because its low dissociation temperature (≈ 630◦ C) and
high equilibrium vapour pressure of nitrogen. Due to these difficulties, early
InN samples were poorly crystalline and exhibited high free ele ...
Monte Carlo simulation of light scattering in the atmosphere and
... We present a Monte Carlo simulation for the scattering of light in the case of an isotropic light source. The
scattering phase functions are studied particularly in detail to understand how they can affect the multiple
light scattering in the atmosphere. We show that although aerosols are usually in ...
QUANTITIES, TERMINOLOGY, AND SYMBOLS IN
... The interaction of electromagnetic radiation with matter causes absorption, emission, and scattering of
radiation. Except for emission and scattering, the absorbed electromagnetic energy is converted to heat
by various nonradiative processes and induces changes in temperature, pressure, and refracti ...
Nanoreplicated positive and inverted submicrometer polymer
... analytical chemistry. The applications of SERS span a range of fields including bacteria detection, water contamination detection, protein-DNA interaction analysis, forensic investigation,
and archeological identification.1 The most important role in SERS is played by the roughened
metal surface, wh ...
Physical properties of silver oxide thin films by pulsed laser deposition
... band gap of the transmitting thin films calculated from the
optical absorption spectra (using a Tauc plot) decreases slightly
(from 1.01 to 0.93 eV for AgO monoclinic structure: table 1)
with increasing oxygen pressure.
Since the oxygen pressure in the growth chamber is rather
high, the silver oxide ...
Elaboration and optimization of tellurite-based
... only the largest T reported for these highly nonlinear glasses to date, but coincides with
a commensurate decrease of the refractive index. A hydroxyl purification has been
developed that when employed, resulted in high purity preform materials exhibiting a
limited absorption in the transmission b ...
Hyper-Raman scattering and the selection rules for the wave vector
... i.e., the delocalization of the vibrations, is expected. It is
known" that the vibrations in disordered media are delocalized if the characteristic height A U of the random potential
relief, in whose fields the vibrational excitation propagates,
is lower than the energy of this excitation. In the sp ...
Inducing Vortices in a Bose-Einstein Condensate using light beams
... The ﬁeld of ultracold atoms has experienced an increasingly rapid development in the
past years. Through the development of new, more advanced experimental techniques,
more and more control and knowledge about the systems under observation is gained.
This allows comparison with theory to so far unre ...
Resonance Raman spectroscopy
Resonance Raman (RR) spectroscopy is a name given to Raman spectroscopy when the incident laser frequency is close in energy to an electronic transition of a compound or crystal under examination. The frequency coincidence (or resonance) can lead to greatly enhanced intensity of the Raman scattering, which facilitates the study of compounds present at low concentrations.Raman scattering is usually extremely weak, of the order of 1 in 10 million photons that hit a sample are scattered with the loss (Stokes) or gain (anti-Stokes) of energy because of changes in vibrational energy of the molecules in the sample. Resonance enhancement of Raman scattering requires that the wavelength of the laser used is close to that of an electronic transition. In larger molecules the change in electron density can be largely confined to one part of the molecule, a chromophore, then the Raman bands that are enhanced are primarily from those parts of the molecule in which the electronic transition leads to a change in bond length in the excited state of the chromophore. For large molecules such as proteins, this selectivity helps to identify the observed bands as originating from vibrational modes of specific parts of the molecule or protein, such as the heme unit within myoglobin.