Micro- and Nanotechnologies for Optical Neural Interfaces
... external sources with single mode fibers, for overall outcoupling efficiency ranging from 23 to 33%. The same authors, in 2012, extended this technology to 3D arrays of independently addressable light emission points with multiple shanks arranged in three-dimensions using a micro-fabricated baseplat ...
... external sources with single mode fibers, for overall outcoupling efficiency ranging from 23 to 33%. The same authors, in 2012, extended this technology to 3D arrays of independently addressable light emission points with multiple shanks arranged in three-dimensions using a micro-fabricated baseplat ...
Superluminal and Slow Light Propagation in a Room
... The superluminal wave propagation is produced by a narrow “antihole” [612 Hz half width at half maximum (HWHM)] in the absorption spectrum of Cr3⫹ ions at the mirror sites of the alexandrite crystal lattice, and the slow light originates from an even narrower hole (8.4 Hz) in the absorption spectrum ...
... The superluminal wave propagation is produced by a narrow “antihole” [612 Hz half width at half maximum (HWHM)] in the absorption spectrum of Cr3⫹ ions at the mirror sites of the alexandrite crystal lattice, and the slow light originates from an even narrower hole (8.4 Hz) in the absorption spectrum ...
Iterative reconstruction algorithm for optoacoustic imaging
... The techniques used to transform the information contained in the optoacoustic signals into images depends on the complexity of the target structures. Single, static detectors are used for layered samples.4 –7 More complicated structures can be imaged by scanning a focused acoustic transducer toget ...
... The techniques used to transform the information contained in the optoacoustic signals into images depends on the complexity of the target structures. Single, static detectors are used for layered samples.4 –7 More complicated structures can be imaged by scanning a focused acoustic transducer toget ...
Optical Measurements of Pollution Dispersion at
... given short period is proportional to λ1.2, i.e. long wavelengths are better. Indeed, the traditional wavelength for such systems is 10.6 μm from a CO2 laser. Practically, however, the cheapness and convenience of modern communications technology outweighs the 10 dB loss implicit in the move to 1.55 ...
... given short period is proportional to λ1.2, i.e. long wavelengths are better. Indeed, the traditional wavelength for such systems is 10.6 μm from a CO2 laser. Practically, however, the cheapness and convenience of modern communications technology outweighs the 10 dB loss implicit in the move to 1.55 ...
Region segmentation and parallel processing for creating large
... Computer-generated holograms (CGH), sometimes called digitally synthetic holograms, make it possible to create the hologram of virtual objects that exist only as the numerical model. In the process of making CGHs, the object fields emitted from the virtual object is, first, calculated from its numeric ...
... Computer-generated holograms (CGH), sometimes called digitally synthetic holograms, make it possible to create the hologram of virtual objects that exist only as the numerical model. In the process of making CGHs, the object fields emitted from the virtual object is, first, calculated from its numeric ...
Transversal ultrasonic probe
... turns out to magnify optical effects of the mechanical contact. 1. Introduction Ultrasonic testing of solid materials may require probing very small areas of a material. This can be done by coupling flat ultrasonic shear wave transducers to conical tips1. In many cases implying simultaneous detectio ...
... turns out to magnify optical effects of the mechanical contact. 1. Introduction Ultrasonic testing of solid materials may require probing very small areas of a material. This can be done by coupling flat ultrasonic shear wave transducers to conical tips1. In many cases implying simultaneous detectio ...
Photoexfoliation of Graphene from Graphite: An Ab Initio Study Yoshiyuki Miyamoto,
... chemical [3–7] exfoliation of graphite, or may form by annealing SiC single crystals [8], or by chemical vapor deposition [9]. Among the production methods, the initial ‘‘scotch tape’’ mechanical exfoliation [1] is still unsurpassed in producing the highest quality samples with a minimum of contamin ...
... chemical [3–7] exfoliation of graphite, or may form by annealing SiC single crystals [8], or by chemical vapor deposition [9]. Among the production methods, the initial ‘‘scotch tape’’ mechanical exfoliation [1] is still unsurpassed in producing the highest quality samples with a minimum of contamin ...
Lecture 35: Holography.
... Transmission hologram: reference and object waves traverse the film from the same side Reflection hologram: reference and object waves traverse the emulsion from opposite sides ...
... Transmission hologram: reference and object waves traverse the film from the same side Reflection hologram: reference and object waves traverse the emulsion from opposite sides ...
Synopsis by Lori Moore
... measurement capabilities. At NIF they are using phase-shifting interferometer which provides them with a three dimensional representation of the profile of the surface. From this profile they calculate the PSD. 2. Spatial Frequency Regimes of Interest The degradation in the performance of an optic ...
... measurement capabilities. At NIF they are using phase-shifting interferometer which provides them with a three dimensional representation of the profile of the surface. From this profile they calculate the PSD. 2. Spatial Frequency Regimes of Interest The degradation in the performance of an optic ...
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Ultrasonic nondestructive characterization of metallurgical reactions
... system and from temperature and pressure fluctuations of the ambient air, are prevented by appropriate design of the interferometer. An optical scheme due to Fizeau is particularly suitable for our specific purpose . Two optical probes are separated to allow accurate measurements of travel lime of a ...
... system and from temperature and pressure fluctuations of the ambient air, are prevented by appropriate design of the interferometer. An optical scheme due to Fizeau is particularly suitable for our specific purpose . Two optical probes are separated to allow accurate measurements of travel lime of a ...
WAVE PLATES
... and slow axes, as shown. After passing through the plate, pick a point in the wave where the fast component passes through a maximum. Since the slow component is retarded by one half-wave, it will also be a maximum, but 180° out of phase, or pointing along the negative slow axis. If we follow the wa ...
... and slow axes, as shown. After passing through the plate, pick a point in the wave where the fast component passes through a maximum. Since the slow component is retarded by one half-wave, it will also be a maximum, but 180° out of phase, or pointing along the negative slow axis. If we follow the wa ...
Efficient Higher Order Full-Wave Numerical Analysis of 3-D Cloaking Structures ć
... transformation-based metamaterial cloaks: (1) linetransformed (cylindrical) cloaks and (2) pointtransformed (spherical) cloaks. In the case of linetransformed or two-dimensional (2-D) cloaks, an infinite straight line is transformed into an infinitely long spatial domain with a finite cross section ...
... transformation-based metamaterial cloaks: (1) linetransformed (cylindrical) cloaks and (2) pointtransformed (spherical) cloaks. In the case of linetransformed or two-dimensional (2-D) cloaks, an infinite straight line is transformed into an infinitely long spatial domain with a finite cross section ...
1 Fundamental Optics www.cvimellesgriot.com
... are made to determine critical parameters such as magnification, focal length(s), clear aperture (diameter), and object and image position. These paraxial calculations are covered in the next section of this chapter. Second, actual components are chosen based on these paraxial values, and their actu ...
... are made to determine critical parameters such as magnification, focal length(s), clear aperture (diameter), and object and image position. These paraxial calculations are covered in the next section of this chapter. Second, actual components are chosen based on these paraxial values, and their actu ...
Measuring the Real Point Spread Function of High Numerical
... Testing and characterization of high-quality lenses have been perfected into fine art with the advent of lasers, phase-shifting interferometers, charge-coupled device (CCD) cameras, and computers. A bewildering array of techniques is described in Malacara’s classic reference book on the subject (Mal ...
... Testing and characterization of high-quality lenses have been perfected into fine art with the advent of lasers, phase-shifting interferometers, charge-coupled device (CCD) cameras, and computers. A bewildering array of techniques is described in Malacara’s classic reference book on the subject (Mal ...
Wave incidence
... wave flows along the (for m1 m 2 ) surface and no energy is transmitted into medium 2. Example The value of the angle of er 2 sin 90 o incidence corresponding to sin q c = er1 this is called critical angle, qc. ...
... wave flows along the (for m1 m 2 ) surface and no energy is transmitted into medium 2. Example The value of the angle of er 2 sin 90 o incidence corresponding to sin q c = er1 this is called critical angle, qc. ...
Cheng - The University of Akron
... Why Electrochemical Synthesis? • Unsubstituted polythiophene is preferred for maximizing refractive index. • Most of other methods only can produce polythiophene powders. • Advantages of electrochemical synthesis: • Direct grafting of the doped conducting polymer films onto the electrode surface • ...
... Why Electrochemical Synthesis? • Unsubstituted polythiophene is preferred for maximizing refractive index. • Most of other methods only can produce polythiophene powders. • Advantages of electrochemical synthesis: • Direct grafting of the doped conducting polymer films onto the electrode surface • ...
Graded-index fibers (GRA)
... Figure 5.11: 6 dB-Bandwidth of the transmitted electrical signal of a multi-mode graded index with numerical aperture AN = 0, 24 L0 is the fiber length to which the bandwidth B0 is related. This may be due to: 1. The refractive index profile is subject to fluctuations, that means fiber pieces altern ...
... Figure 5.11: 6 dB-Bandwidth of the transmitted electrical signal of a multi-mode graded index with numerical aperture AN = 0, 24 L0 is the fiber length to which the bandwidth B0 is related. This may be due to: 1. The refractive index profile is subject to fluctuations, that means fiber pieces altern ...
Retroreflector
A retroreflector (sometimes called a retroflector or cataphote) is a device or surface that reflects light back to its source with a minimum of scattering. In a retroreflector an electromagnetic wavefront is reflected back along a vector that is parallel to but opposite in direction from the wave's source. The angle of incidence at which the device or surface reflects light in this way is greater than zero, unlike a planar mirror, which does this only if the mirror is exactly perpendicular to the wave front, having a zero angle of incidence.