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High resolution, high contrast, high focal depth nonlinear beams
... several areas of laser optics among the most important, ranging from material processing to microscopy and to the development of novel coherent light sources. Conical waves are unique and peculiar wave packets, in which the energy flow is not directed along the beam axis, as in conventional waves. I ...
... several areas of laser optics among the most important, ranging from material processing to microscopy and to the development of novel coherent light sources. Conical waves are unique and peculiar wave packets, in which the energy flow is not directed along the beam axis, as in conventional waves. I ...
IMPORTANT FEATURES FOR A RIGHT - pi
... plane of analysis; it differs both from Airy Disk and flattop functions and is, evidently, useless for practical applications. As we see the focusing of a flattop beam never leads to creating a spot with uniform intensity, neither in focal plane nor in intermediate planes. In other words: If a parti ...
... plane of analysis; it differs both from Airy Disk and flattop functions and is, evidently, useless for practical applications. As we see the focusing of a flattop beam never leads to creating a spot with uniform intensity, neither in focal plane nor in intermediate planes. In other words: If a parti ...
appel a projets recherche 2014 - lumat - Université Paris-Sud
... in space – down to the Å scale – to coherently excite electronic/nuclear wave packets in a controlled manner, and to probe their temporal evolution. These gradients are ideally provided by fully controlled photon beams, from the mid-IR to the XUV range: the manipulation of light pulses is therefore ...
... in space – down to the Å scale – to coherently excite electronic/nuclear wave packets in a controlled manner, and to probe their temporal evolution. These gradients are ideally provided by fully controlled photon beams, from the mid-IR to the XUV range: the manipulation of light pulses is therefore ...
Generation of Repumping Light for Ultracold Strontium Experiments
... Bachelor of Science in Physics from the University of California, Santa Barbara. ...
... Bachelor of Science in Physics from the University of California, Santa Barbara. ...
An ultrafast reconfigurable nanophotonic switch using
... scatterers.5,6 Exciting new techniques have emerged based on shaping of the light field itself to match a given scattering configuration, either through time reversal7,8 or iterative schemes.9,10 The method of wavefront shaping is based on the general concept that the transmission through any medium ...
... scatterers.5,6 Exciting new techniques have emerged based on shaping of the light field itself to match a given scattering configuration, either through time reversal7,8 or iterative schemes.9,10 The method of wavefront shaping is based on the general concept that the transmission through any medium ...
OM1 - Faculty of Engineering
... reflected by the beam splitter. Thus, the two beams are brought together to form interference fringes. Since one beam passes through BS 3 times, a compensating plate C is required for another beam so that both beams pass through equal thickness of glass. The inclusion of a compensating plate negates ...
... reflected by the beam splitter. Thus, the two beams are brought together to form interference fringes. Since one beam passes through BS 3 times, a compensating plate C is required for another beam so that both beams pass through equal thickness of glass. The inclusion of a compensating plate negates ...
Post-print of: J. Mater. Chem. , 2010, 20, 6408
... shape of the columns defining the film microstructure. In Fig. 1 a scheme of the deposition procedure is drawn and the relevant geometrical parameters indicated. Full details on the experimental parameters employed are given in the ESI.† In Fig. 2 we show field emission scanning electron microscopy ...
... shape of the columns defining the film microstructure. In Fig. 1 a scheme of the deposition procedure is drawn and the relevant geometrical parameters indicated. Full details on the experimental parameters employed are given in the ESI.† In Fig. 2 we show field emission scanning electron microscopy ...
Coherent manipulation of atoms with standing light waves
... momentum in well-determined quantities, coherently splitting atomic wavepackets, and generating forces much larger than possible with spontaneously scattered light. Not surprisingly, this interaction has many distinct facets that only appear in different regimes of the interaction parameters (intens ...
... momentum in well-determined quantities, coherently splitting atomic wavepackets, and generating forces much larger than possible with spontaneously scattered light. Not surprisingly, this interaction has many distinct facets that only appear in different regimes of the interaction parameters (intens ...
Initial demonstration of a local, evanescent, array coupled biosensor concept
... NSOM tip size. Light is coupled into the waveguide approximately 4mm to the left of the area shown. The three regions of the waveguide before, coincident with, and after the adlayer are referred to as Regions I, II, and III, respectively. Figure 2(b) represents the corresponding contour plot of the ...
... NSOM tip size. Light is coupled into the waveguide approximately 4mm to the left of the area shown. The three regions of the waveguide before, coincident with, and after the adlayer are referred to as Regions I, II, and III, respectively. Figure 2(b) represents the corresponding contour plot of the ...
Lecture-10-Optics
... two beam case: I = 4I0cos2/2 with =k0(r1-r2). The difference is due to an added = due to reflection in the case of dielectric films which cause the cosine to become a sine. This is similar to the case for Lloyds mirror. Note also that multiple beam interference results in a redistribution of ...
... two beam case: I = 4I0cos2/2 with =k0(r1-r2). The difference is due to an added = due to reflection in the case of dielectric films which cause the cosine to become a sine. This is similar to the case for Lloyds mirror. Note also that multiple beam interference results in a redistribution of ...
Total Internal Reflection Fluorescence
... interface, with a space constant that depends on the refractive index of the glass and the sample and the angle of incidence of the excitation light. The fluorophores at the glasssample interface that are within the evanescent field are excited by this excitation light. Excitation light for TIRF mic ...
... interface, with a space constant that depends on the refractive index of the glass and the sample and the angle of incidence of the excitation light. The fluorophores at the glasssample interface that are within the evanescent field are excited by this excitation light. Excitation light for TIRF mic ...
Why Did John Herschel Fail to Understand Polarization
... The frame for ‘particle’ also determines the possible concepts at the subordinate level, and thus defines the conceptual field on which various optical phenomena can be understood and explained with the help of laws from mechanics, particularly the laws regarding repulsive or attractive forces. For ...
... The frame for ‘particle’ also determines the possible concepts at the subordinate level, and thus defines the conceptual field on which various optical phenomena can be understood and explained with the help of laws from mechanics, particularly the laws regarding repulsive or attractive forces. For ...
An optical cloak made of dielectrics LETTERS *
... bump shows three distinct spots at the output grating due to the scattering of the bump. The flat surface shows the expected Gaussian beam profile, similar to that of the incident wave. To hide the bump on the surface, the designed cloak pattern was placed around the bump in Fig. 3c. Subsequently, t ...
... bump shows three distinct spots at the output grating due to the scattering of the bump. The flat surface shows the expected Gaussian beam profile, similar to that of the incident wave. To hide the bump on the surface, the designed cloak pattern was placed around the bump in Fig. 3c. Subsequently, t ...
Inducing Vortices in a Bose-Einstein Condensate using light beams
... different than classical vortex flow [17, 18]: Only above a certain rotation frequency, lines of singularity, corresponding to vortex cores form. Around these cores, there is a quantized flow of the superfluid with circulation nh/m (where n is an integer, and m the particle mass). Interestingly though, ...
... different than classical vortex flow [17, 18]: Only above a certain rotation frequency, lines of singularity, corresponding to vortex cores form. Around these cores, there is a quantized flow of the superfluid with circulation nh/m (where n is an integer, and m the particle mass). Interestingly though, ...
Demonstration of a large-scale optical exceptional point structure Liang Feng, Xuefeng Zhu,
... the parity-time phase transition point, a type of exceptional points. However, exceptional point is much more general concept, contains broader and richer physics, and should thus be expected in a larger non-Hermitian family: exceptional points are singularities in the complex eigen spectrum and inh ...
... the parity-time phase transition point, a type of exceptional points. However, exceptional point is much more general concept, contains broader and richer physics, and should thus be expected in a larger non-Hermitian family: exceptional points are singularities in the complex eigen spectrum and inh ...
Fourier domain optical coherence tomography with an
... estimated in section 3, and the central lobe widths were constant of value 13µm over the depth of focus. The peak intensity was decreased as the measured plane is moved away from the axicon lens because the incident beam is Gaussian in shape. For comparison with a conventional lens we also measured ...
... estimated in section 3, and the central lobe widths were constant of value 13µm over the depth of focus. The peak intensity was decreased as the measured plane is moved away from the axicon lens because the incident beam is Gaussian in shape. For comparison with a conventional lens we also measured ...
3D Finite Element Model for Writing Long
... stress-related issues regarding the processing of the optical fibers, the residual axial elastic stresses were implemented considering Equations (9) and (10) and the total resulting stress was obtained adding the thermally-induced residual stresses obtained with the program. The implemented geometry ...
... stress-related issues regarding the processing of the optical fibers, the residual axial elastic stresses were implemented considering Equations (9) and (10) and the total resulting stress was obtained adding the thermally-induced residual stresses obtained with the program. The implemented geometry ...
Collective effects in the radiation pressure force
... of view, and as far as diffraction effects are concerned, the atomic cloud can be described as a dielectric medium with an effective complex refractive index, even when the atoms are separated by more than a wavelength. The real part of the index corresponds to the coherent scattering of the inciden ...
... of view, and as far as diffraction effects are concerned, the atomic cloud can be described as a dielectric medium with an effective complex refractive index, even when the atoms are separated by more than a wavelength. The real part of the index corresponds to the coherent scattering of the inciden ...
High frequency characterization of the Gsanger LM0202P eletro-optic [i.e. electro-optic] modulator
... As the vertically polarized light wave propagates through the electro-optic crystal the plane of polarization is rotated 90 degrees ...
... As the vertically polarized light wave propagates through the electro-optic crystal the plane of polarization is rotated 90 degrees ...
Absorption-induced trapping in an anisotropic
... working too near or far from a resonance. In a medium consisting of a warm vapor, inhomogeneous Doppler broadening produces linewidths that are typically a factor of 100 larger than the homogeneous linewidth; thus, substantial absorption occurs over a large bandwidth and the atom-photon coupling is ...
... working too near or far from a resonance. In a medium consisting of a warm vapor, inhomogeneous Doppler broadening produces linewidths that are typically a factor of 100 larger than the homogeneous linewidth; thus, substantial absorption occurs over a large bandwidth and the atom-photon coupling is ...
Total Internal Reflection Spectroscopy for Studying Soft Matter
... be delivered to the sample simultaneously) and can be difficult to interpret. Furthermore, molecules at an interface that do not have a preferred orientation are invisible in second-order nonlinear spectroscopy, so such techniques are of limited value for quantitative analysis of composition. The se ...
... be delivered to the sample simultaneously) and can be difficult to interpret. Furthermore, molecules at an interface that do not have a preferred orientation are invisible in second-order nonlinear spectroscopy, so such techniques are of limited value for quantitative analysis of composition. The se ...
Structural and optical properties of visible active
... where e 5 DL/L is the strain in the [hkl] direction, k 0.9 is the geometric shape factor for a spherical scatterer, k is the x-ray wave length, bc the full width at half maximum, FWHM, of the XRD peak, bi the instrumental broadening, and h the diffraction angle. The program XPERT PRO was used to r ...
... where e 5 DL/L is the strain in the [hkl] direction, k 0.9 is the geometric shape factor for a spherical scatterer, k is the x-ray wave length, bc the full width at half maximum, FWHM, of the XRD peak, bi the instrumental broadening, and h the diffraction angle. The program XPERT PRO was used to r ...
Sample pages 1 PDF
... where h is Planck’s constant (6.625 × 10−34 J s), ν is frequency (c/λ, where c is the velocity of light, i.e., 2.99 × 108 m s−1 , and λ is the wavelength of light in metres) and p is a constant characteristic of the material. In the wave theory, the radiation would be spread over the surface and wou ...
... where h is Planck’s constant (6.625 × 10−34 J s), ν is frequency (c/λ, where c is the velocity of light, i.e., 2.99 × 108 m s−1 , and λ is the wavelength of light in metres) and p is a constant characteristic of the material. In the wave theory, the radiation would be spread over the surface and wou ...
All-angle negative refraction and imaging in a visible region
... that negative refraction can exist without a negative refractive index. So far, demonstration of negative refraction and imaging in bulk materials at visible frequencies still remains very challenging [16-19]. As NIMs rely on resonance, they are usually accompanied by significant losses, especially ...
... that negative refraction can exist without a negative refractive index. So far, demonstration of negative refraction and imaging in bulk materials at visible frequencies still remains very challenging [16-19]. As NIMs rely on resonance, they are usually accompanied by significant losses, especially ...
3D–2D–3D photonic crystal heterostructures fabricated by direct
... photonic crystal heterostructures3–6 in which a 2D photonic crystal layer (comprising waveguides, etc.) is clad by 3D photonic bandgap materials on both sides (Fig. 1). In principle this approach totally eliminates losses into the third dimension for frequencies in the 3D photonic bandgap. Furthermo ...
... photonic crystal heterostructures3–6 in which a 2D photonic crystal layer (comprising waveguides, etc.) is clad by 3D photonic bandgap materials on both sides (Fig. 1). In principle this approach totally eliminates losses into the third dimension for frequencies in the 3D photonic bandgap. Furthermo ...
Phase-contrast X-ray imaging
![](https://commons.wikimedia.org/wiki/Special:FilePath/Attenuation_and_phase_shift_of_electromagnetic_wave_propagating_in_medium_with_complex_index_of_refraction_n.png?width=300)
Phase-contrast X-ray imaging (PCI) or phase-sensitive X-ray imaging is a general term for different technical methods that use information concerning changes in the phase of an X-ray beam that passes through an object in order to create its images. Standard X-ray imaging techniques like radiography or computed tomography (CT) rely on a decrease of the X-ray beam's intensity (attenuation) when traversing the sample, which can be measured directly with the assistance of an X-ray detector. In PCI however, the beam's phase shift caused by the sample is not measured directly, but is transformed into variations in intensity, which then can be recorded by the detector.In addition to producing projection images, PCI, like conventional transmission, can be combined with tomographic techniques to obtain the 3D distribution of the real part of the refractive index of the sample. When applied to samples that consist of atoms with low atomic number Z, PCI is more sensitive to density variations in the sample than conventional transmission-based X-ray imaging. This leads to images with improved soft tissue contrast.In the last several years, a variety of phase-contrast X-ray imaging techniques have been developed, all of which are based on the observation of interference patterns between diffracted and undiffracted waves. The most common techniques are crystal interferometry, propagation-based imaging, analyzer-based imaging, edge-illumination and grating-based imaging (see below).