9.2. Summary - Stanford Synchrotron Radiation Lightsource
... a problem (the specification of beam "wander" in the LCLS design study report is ~10% of the beam diameter, i.e. independent of path length). The angular acceptance for SASE saturation through the undulator is of the same order as the beam divergence, so any beam angle excursions larger than this va ...
... a problem (the specification of beam "wander" in the LCLS design study report is ~10% of the beam diameter, i.e. independent of path length). The angular acceptance for SASE saturation through the undulator is of the same order as the beam divergence, so any beam angle excursions larger than this va ...
Diffuse optical imaging
... examination, which is the case when imaging a tumour, we are more interested in the brain’s response to a stimulus over a period of a few seconds. We therefore choose to use faster imaging systems and linear reconstruction, which generates images of the change in optical properties. Arguably the mos ...
... examination, which is the case when imaging a tumour, we are more interested in the brain’s response to a stimulus over a period of a few seconds. We therefore choose to use faster imaging systems and linear reconstruction, which generates images of the change in optical properties. Arguably the mos ...
Ultrafast Acoustic Phonon Ballistics in Semiconductor Heterostructures
... is rapid phonon thermalization via electron-electron scattering within the photoinjected plasma [18]. The plasma would then rapidly emit low-frequency ballistic phonons; however this is unable to account for the 300 ps rise time observed here. At later times, the quasiballistic arrivals merge with q ...
... is rapid phonon thermalization via electron-electron scattering within the photoinjected plasma [18]. The plasma would then rapidly emit low-frequency ballistic phonons; however this is unable to account for the 300 ps rise time observed here. At later times, the quasiballistic arrivals merge with q ...
Measuring amplitude and phase in optical fields with
... In order to get sub-wavelength resolution in optical fields, it is crucial to probe high spatial frequencies contained in evanescent waves. To access the evanescent waves, a probe has to be brought close to the surface. “Close” or “near” means smaller than a wavelength (in contrast to “far”) because ...
... In order to get sub-wavelength resolution in optical fields, it is crucial to probe high spatial frequencies contained in evanescent waves. To access the evanescent waves, a probe has to be brought close to the surface. “Close” or “near” means smaller than a wavelength (in contrast to “far”) because ...
Deconvolution Microscopy
... through media with different refraction indices. Optical paths differ from the optimal paths for which the objectives were designed, generating spherical aberrations that can severely affect the ideal image of a point source. In general, only the plane position just above a coverslip of a given thic ...
... through media with different refraction indices. Optical paths differ from the optimal paths for which the objectives were designed, generating spherical aberrations that can severely affect the ideal image of a point source. In general, only the plane position just above a coverslip of a given thic ...
Diffracting fractals: new paradigms in linear wave physics
... and medical contexts). While much previous research has examined the scattering of non-fractal waves by fractal structures, there has been relatively little investigation of the consequences of fractal illumination. However, it has for example been demonstrated (both theoretically and experimentally ...
... and medical contexts). While much previous research has examined the scattering of non-fractal waves by fractal structures, there has been relatively little investigation of the consequences of fractal illumination. However, it has for example been demonstrated (both theoretically and experimentally ...
P510/2 - Sharebility
... (b) (i) If the direction of the incident ray is kept constant, show that the angle of rotation of the reflected ray is twice the angle of rotation of the mirror. (3 marks) (ii) Describe how an optical lever in a mirror galvanometer is used to measure small electric currents. (5 marks) (c) (i) What i ...
... (b) (i) If the direction of the incident ray is kept constant, show that the angle of rotation of the reflected ray is twice the angle of rotation of the mirror. (3 marks) (ii) Describe how an optical lever in a mirror galvanometer is used to measure small electric currents. (5 marks) (c) (i) What i ...
Nanomechanical Motion Transducers for Miniaturized
... to actuate NEMS photothermally using free-space optics, but the technique could also be implemented within an integrated optical chip. Using a tightly focused light beam results in high spatial resolution for the photothermal actuator, allowing for the actuation of higher modes of NEMS. Conversely, ...
... to actuate NEMS photothermally using free-space optics, but the technique could also be implemented within an integrated optical chip. Using a tightly focused light beam results in high spatial resolution for the photothermal actuator, allowing for the actuation of higher modes of NEMS. Conversely, ...
Light & Matter: Absorption and Scattering
... A white beam source ‐‐ emitting light of multiple wavelengths ‐‐ is focused on a sample (the complementary color pairs are indicated by the yellow dotted lines). Upon striking the sample, photons that match the energy gap of the molecules present (green light in this example) is absorbed in order ...
... A white beam source ‐‐ emitting light of multiple wavelengths ‐‐ is focused on a sample (the complementary color pairs are indicated by the yellow dotted lines). Upon striking the sample, photons that match the energy gap of the molecules present (green light in this example) is absorbed in order ...
Ray-optics cloaking devices for large objects in incoherent natural light
... hide objects roughly one wavelength large (an optical wavelength equates to the scale of single-celled organisms) have been experimentally demonstrated in both the microwave4,7,10 and optical spectrum8,9,11. Successful attempts have also been made to allow the cloaking technology to be used at much ...
... hide objects roughly one wavelength large (an optical wavelength equates to the scale of single-celled organisms) have been experimentally demonstrated in both the microwave4,7,10 and optical spectrum8,9,11. Successful attempts have also been made to allow the cloaking technology to be used at much ...
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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.