Signal-to-Signal-to-Noise-Ratio of Full-Field Fourier
... (DFT). This concept implementation has been recently demonstrated as spectral-domain OCT (SD-OCT) [4,5] and swept-source OCT (SS-OCT) [6]. It has been also demonstrated that the signal-to-noise ratio (SNR) of this new parallel data acquisition approach is improved as compared with that of TD-OCT, wh ...
... (DFT). This concept implementation has been recently demonstrated as spectral-domain OCT (SD-OCT) [4,5] and swept-source OCT (SS-OCT) [6]. It has been also demonstrated that the signal-to-noise ratio (SNR) of this new parallel data acquisition approach is improved as compared with that of TD-OCT, wh ...
Phononic Crystal Waveguiding in GaAs Golnaz Azodi Aval
... The fundamental frequency of the transducers, obtained from S11 measurements plotted versus wave vector. Transducers are single and double fingers of aluminum on a GaAs substrate. The half width of S11 peaks is about 4 MHz and therefore the error bars are too small to be shown on the graph. The Line ...
... The fundamental frequency of the transducers, obtained from S11 measurements plotted versus wave vector. Transducers are single and double fingers of aluminum on a GaAs substrate. The half width of S11 peaks is about 4 MHz and therefore the error bars are too small to be shown on the graph. The Line ...
crystals - MDPI.com
... ligands and metal species that display different network structures”. This type of phenomenon has been shown in MOFs constructed from H2TBC and Zinc by changing the solvent system. Historically MOFs utilizing H2TBC as the ligand have for the most part been paired with zinc via the hydrothermal techn ...
... ligands and metal species that display different network structures”. This type of phenomenon has been shown in MOFs constructed from H2TBC and Zinc by changing the solvent system. Historically MOFs utilizing H2TBC as the ligand have for the most part been paired with zinc via the hydrothermal techn ...
Periodically Poled Lithium Niobate (PPLN) - Tutorial
... fact that the orientation of the Lithium Niobate crystal is periodically inverted (poled). The inverted portions of the crystal yield generated photons that are 180° out of phase with the generated photon that would have been created at that point in the crystal if it had not been poled. By choosing ...
... fact that the orientation of the Lithium Niobate crystal is periodically inverted (poled). The inverted portions of the crystal yield generated photons that are 180° out of phase with the generated photon that would have been created at that point in the crystal if it had not been poled. By choosing ...
Optics of Gaussian Beams
... The question could be asked – why should lasers that frequently have apparent cylindrical symmetry both in construction and excitation geometry generate transverse mode with Cartesian rather than radial symmetry? The answer is that this usually results because there is indeed some feature of laser c ...
... The question could be asked – why should lasers that frequently have apparent cylindrical symmetry both in construction and excitation geometry generate transverse mode with Cartesian rather than radial symmetry? The answer is that this usually results because there is indeed some feature of laser c ...
A short introduction to light and electron microscopy
... Light interacts with matter in a variety of ways. Light incident on an object might be absorbed, transmitted, reflected, or diffracted. Such objects are opaque, transparent, reflective, or scattering. Light may be absorbed and then re-emitted as visible light or as heat. Objects or molecules that ab ...
... Light interacts with matter in a variety of ways. Light incident on an object might be absorbed, transmitted, reflected, or diffracted. Such objects are opaque, transparent, reflective, or scattering. Light may be absorbed and then re-emitted as visible light or as heat. Objects or molecules that ab ...
Bandgap-assisted surface-plasmon sensing Arnaud J. Benahmed* and Chih-Ming Ho
... its sensitivity is contingent on the divergence angle of the excitation beam. The problem becomes pronounced for compact systems when a low-cost LED is used as the light source. When the Kretschmann configuration with a periodically modulated surface is used, a bandgap appears in the surface plasmon ...
... its sensitivity is contingent on the divergence angle of the excitation beam. The problem becomes pronounced for compact systems when a low-cost LED is used as the light source. When the Kretschmann configuration with a periodically modulated surface is used, a bandgap appears in the surface plasmon ...
Beam manipulation: prisms vs. mirrors
... layout into a more compact form, or to redirect light to the next component. In either case, the choice inevitably arises between mirrors, or alternatively, prisms. Solutions may often be found either way, but making the best selection up-front could save the designer from potential problems later. ...
... layout into a more compact form, or to redirect light to the next component. In either case, the choice inevitably arises between mirrors, or alternatively, prisms. Solutions may often be found either way, but making the best selection up-front could save the designer from potential problems later. ...
THE THEORY OF ELECTROMAGNETIC WAVES IN A CRYSTAL IN
... K results from this expression, i.e., if I H 3 /H~ I :s 1, then Eqs. ( 26), ( 2 7), and ( 29) are the solutions of the problem of the semi-infinite crystal. From this one finds that the probability that the excitation will remain in a cell with coordinate n is given by I an 12 • This probability doe ...
... K results from this expression, i.e., if I H 3 /H~ I :s 1, then Eqs. ( 26), ( 2 7), and ( 29) are the solutions of the problem of the semi-infinite crystal. From this one finds that the probability that the excitation will remain in a cell with coordinate n is given by I an 12 • This probability doe ...
Defect-based Photonic Crystal Cavity for Silicon Laser PHYC/ECE 568
... to the defect and slab. This strong localization is favorable in nonlinear optics, because it helps better overlap between the electromagnetic waves taking part in the nonlinear process, resulting in a more efficient nonlinear process. An additional enhancement of nonlinear processes in photonic cry ...
... to the defect and slab. This strong localization is favorable in nonlinear optics, because it helps better overlap between the electromagnetic waves taking part in the nonlinear process, resulting in a more efficient nonlinear process. An additional enhancement of nonlinear processes in photonic cry ...
Picosecond-resolution soft-x-ray laser plasma interferometry
... layer soft-x-ray mirrors. However, the wave-frontdivision interferometers have the drawback of a higher requirement on the spatial coherence of the laser source. This limitation can be overcome if the source is placed far away from the interferometer as, according to the Huygens–Fresnel principle,12 ...
... layer soft-x-ray mirrors. However, the wave-frontdivision interferometers have the drawback of a higher requirement on the spatial coherence of the laser source. This limitation can be overcome if the source is placed far away from the interferometer as, according to the Huygens–Fresnel principle,12 ...
Frequency domain optical parametric amplification - few
... When pumping the FP with 12.8 mJ,B2ps pulses at a centre wavelength of 800 nm, an energy of 1.76 mJ was measured in the FP. This corresponds to an output energy of 1.43 mJ due to the 75% transmission of one half of the 4-f setup. The energy stability was o3% rms and the corresponding beam profile is ...
... When pumping the FP with 12.8 mJ,B2ps pulses at a centre wavelength of 800 nm, an energy of 1.76 mJ was measured in the FP. This corresponds to an output energy of 1.43 mJ due to the 75% transmission of one half of the 4-f setup. The energy stability was o3% rms and the corresponding beam profile is ...
At-wavelength figure metrology of hard x
... hard x-ray microscopy, microdiffraction, and spectromicroscopy using a hard x-ray microprobe have the ability to analyze materials nondestructively with precise spatial information. In these techniques, not only the focusing size of the hard x rays, but also the focusing intensity distribution prope ...
... hard x-ray microscopy, microdiffraction, and spectromicroscopy using a hard x-ray microprobe have the ability to analyze materials nondestructively with precise spatial information. In these techniques, not only the focusing size of the hard x rays, but also the focusing intensity distribution prope ...
Direct measurement of terahertz wavefront pulses using 2D electro
... Wavefront characterization of terahertz (THz) pulses is essential to optimize far-field intensity distribution or spot focalization, as well as increase the peak power of intense terahertz sources. In the visible spectral region, Hartmann masks, invented a century ago, are used to perform optical me ...
... Wavefront characterization of terahertz (THz) pulses is essential to optimize far-field intensity distribution or spot focalization, as well as increase the peak power of intense terahertz sources. In the visible spectral region, Hartmann masks, invented a century ago, are used to perform optical me ...
1 L5: Diffraction L5 DIFFRACTION Objectives Aims From this
... known as Fresnel diffraction, can be mathematically very complex. However, calculations are greatly simplified if both the source and the screen are at very large distances from the aperture (i.e. if those distances are much greater than the diameter of the aperture). We will deal quantitatively onl ...
... known as Fresnel diffraction, can be mathematically very complex. However, calculations are greatly simplified if both the source and the screen are at very large distances from the aperture (i.e. if those distances are much greater than the diameter of the aperture). We will deal quantitatively onl ...
Large acceptance of non-collinear phase
... precisely control the direction of interactive waves and temperature of the crystal to satisfy phase- matching condition, quasi-phase-matching (QPM) [2–4] which involves a periodic modulation of second-order nonlinearity coefficient to supply the reciprocal vector Gm = 2π m/Λ (Λ, m) to compensate fo ...
... precisely control the direction of interactive waves and temperature of the crystal to satisfy phase- matching condition, quasi-phase-matching (QPM) [2–4] which involves a periodic modulation of second-order nonlinearity coefficient to supply the reciprocal vector Gm = 2π m/Λ (Λ, m) to compensate fo ...
Fourier-domain holography in photorefractive quantum-well films
... images inside living tissue.9 However, the current generation of PRQW devices has fabrication-related defects that limit the sensitivity and dynamic range of photorefractive holography because of scattered background. The dynamic range 共without any spatial filtering兲 was reported to be 45 dB for the ...
... images inside living tissue.9 However, the current generation of PRQW devices has fabrication-related defects that limit the sensitivity and dynamic range of photorefractive holography because of scattered background. The dynamic range 共without any spatial filtering兲 was reported to be 45 dB for the ...
High resolution transmission electron microscopy
... secondary waves with same wavelength as that of the primary wave (wavelets).The amplitude in any point of the space beyond the obstacle is the superposition of all these wavelets (considering their amplitudes and relative phases). ...
... secondary waves with same wavelength as that of the primary wave (wavelets).The amplitude in any point of the space beyond the obstacle is the superposition of all these wavelets (considering their amplitudes and relative phases). ...
Optics for next generation light sources Anton Barty
... Note: For testing purposes the same figure and PSD was used for all SOMS mirrors. This is trivial to change when we have new metrology data - the use of beamline scripting simplifies changes (although some format checking is still required). ...
... Note: For testing purposes the same figure and PSD was used for all SOMS mirrors. This is trivial to change when we have new metrology data - the use of beamline scripting simplifies changes (although some format checking is still required). ...
1. Introduction - About the journal
... Rytov theory. The probability of correct signal detection in direct detection system in dependence on many parameters such as link distance, power link margin, refractive-index structure parameter, etc. is discussed and different approaches to the evaluation of scintillation effect are compared. The ...
... Rytov theory. The probability of correct signal detection in direct detection system in dependence on many parameters such as link distance, power link margin, refractive-index structure parameter, etc. is discussed and different approaches to the evaluation of scintillation effect are compared. The ...
Enhancement of absorption and color contrast in
... dielectric films.4,5 By combining metals or metal-like materials with dielectrics featuring strong optical absorption, the thickness of the films can be reduced even further (e.g. k/(20n)) due to the nontrivial (not 0 or p) reflection phase shifts at interfaces between one or more lossy materials. ...
... dielectric films.4,5 By combining metals or metal-like materials with dielectrics featuring strong optical absorption, the thickness of the films can be reduced even further (e.g. k/(20n)) due to the nontrivial (not 0 or p) reflection phase shifts at interfaces between one or more lossy materials. ...
Sample pages
... 1.1.6. Some analytical aspects of the reciprocal space .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. ...
... 1.1.6. Some analytical aspects of the reciprocal space .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. ...
Fabrication of two-layer integrated phase mask for
... the case of positive resist, the overexposed material is then dissolved away in the postexposure processing. The underexposed region forms a periodic network and acts as a 3D photonic crystal template. For negative photoresists, the underexposed regions can then be selectively removed using a develo ...
... the case of positive resist, the overexposed material is then dissolved away in the postexposure processing. The underexposed region forms a periodic network and acts as a 3D photonic crystal template. For negative photoresists, the underexposed regions can then be selectively removed using a develo ...
Self-assembly of three-dimensional photonic-crystals with
... colloidal crystals on the patterned substrates. The substrate was placed vertically into a vial containing an aqueous suspension of either 300 or 400 nm diameter polystyrene spheres. The volume fraction of the solution was around 0.5% wt. The vial is kept in a temperature-controlled oven. The drying ...
... colloidal crystals on the patterned substrates. The substrate was placed vertically into a vial containing an aqueous suspension of either 300 or 400 nm diameter polystyrene spheres. The volume fraction of the solution was around 0.5% wt. The vial is kept in a temperature-controlled oven. The drying ...
1.5% root-mean-square flat-intensity laser beam
... flat-top beams with different parameters, but also any slowly varying target beam shape. It can be used to generate the homogeneous optical lattice required for Bose–Einstein condensate cold atom experiments. © 2009 Optical Society of America OCIS codes: ...
... flat-top beams with different parameters, but also any slowly varying target beam shape. It can be used to generate the homogeneous optical lattice required for Bose–Einstein condensate cold atom experiments. © 2009 Optical Society of America OCIS codes: ...