Inexpensive optical tweezers for undergraduate laboratories
... In this section, detailed selection criteria for the components of the tweezers will be discussed. With other microscopes, lasers, or wavelengths, the selection criteria will remain the same, but the specific values for the required components may be different. A. Laser There are four important char ...
... In this section, detailed selection criteria for the components of the tweezers will be discussed. With other microscopes, lasers, or wavelengths, the selection criteria will remain the same, but the specific values for the required components may be different. A. Laser There are four important char ...
here - Optoelectronics Research Centre
... one dimensional, axial profile obtained at a point location while B-scan is a two dimensional, cross sectional image of the sample that is built up from a laterally displaced A-scans. OCT has less penetration depth than ultrasound techniques but its main advantage is that it can provide micron level ...
... one dimensional, axial profile obtained at a point location while B-scan is a two dimensional, cross sectional image of the sample that is built up from a laterally displaced A-scans. OCT has less penetration depth than ultrasound techniques but its main advantage is that it can provide micron level ...
diffraction uniformly illuminated circular aperture
... DIFFRACTION UNIFORMLY ILLUMINATED CIRCULAR APERTURE If a small hole in an opaque screen is placed between a light source and an observation screen then the shadow of the hole does not have a sharp outline as predicted by geometrical optics. On close examination of the shadow on the observation scree ...
... DIFFRACTION UNIFORMLY ILLUMINATED CIRCULAR APERTURE If a small hole in an opaque screen is placed between a light source and an observation screen then the shadow of the hole does not have a sharp outline as predicted by geometrical optics. On close examination of the shadow on the observation scree ...
Superluminal and Slow Light Propagation in a Room
... However, all of these techniques for producing both fast and slow light require complicated experimental configurations and/or low temperatures. In contrast to these techniques, we recently used a different quantum effect—coherent population oscillations—to produce a group velocity of 58 m/s at room ...
... However, all of these techniques for producing both fast and slow light require complicated experimental configurations and/or low temperatures. In contrast to these techniques, we recently used a different quantum effect—coherent population oscillations—to produce a group velocity of 58 m/s at room ...
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 ...
3D Finite Element Model for Writing Long
... micrometers. LPFGs require therefore simpler fabrication processes and have lower costs, and show lower retro-reflection, higher sensitivity and robustness in sensing applications when compared with FBG [8]. A LPFG can be produced mechanically [9], chemically (etching) [10], by photonic processes (u ...
... micrometers. LPFGs require therefore simpler fabrication processes and have lower costs, and show lower retro-reflection, higher sensitivity and robustness in sensing applications when compared with FBG [8]. A LPFG can be produced mechanically [9], chemically (etching) [10], by photonic processes (u ...
Bandgap-assisted surface-plasmon sensing Arnaud J. Benahmed* and Chih-Ming Ho
... A convenient technique is to use the Kretschmann configuration [4], which consists of a high-index prism with a thin layer of gold or silver deposited on one face. TM-polarized light is sent inside the prism where it internally reflects at the metal– dielectric interface. When the transverse momentu ...
... A convenient technique is to use the Kretschmann configuration [4], which consists of a high-index prism with a thin layer of gold or silver deposited on one face. TM-polarized light is sent inside the prism where it internally reflects at the metal– dielectric interface. When the transverse momentu ...
Variable Incidence Angle Fluorescence Interference Contrast
... that only transmits a thin annulus of light (see Fig. 2 C). A set of photomasks (Delta Mask, Enschede, The Netherlands), with transparent annuli of 0.5 mm width and median radii (halfway between the inner and outer radii), r, of 0.25, 0.75, 1.25, 1.75, 2.25, 2.75, 3.25, 3.75, 4.25, 4.75, 5.25, and 5 ...
... that only transmits a thin annulus of light (see Fig. 2 C). A set of photomasks (Delta Mask, Enschede, The Netherlands), with transparent annuli of 0.5 mm width and median radii (halfway between the inner and outer radii), r, of 0.25, 0.75, 1.25, 1.75, 2.25, 2.75, 3.25, 3.75, 4.25, 4.75, 5.25, and 5 ...
Optical simulation of phosphor layer of white LEDs
... Key words: Monte Carlo method; white LED; CCT; YAG:Ce3C phosphor coating DOI: 10.1088/1674-4926/34/5/053008 EEACC: 2520 ...
... Key words: Monte Carlo method; white LED; CCT; YAG:Ce3C phosphor coating DOI: 10.1088/1674-4926/34/5/053008 EEACC: 2520 ...
Wave optics theory and 3-D deconvolution
... optical signal below the Shannon-Nyquist limit, causing high frequency features to be aliased in the light field. In conventional imaging, such aliasing is undesirable because it irreversibly corrupts the recorded image. However, in light field imaging, aliasing is actually beneficial. In particula ...
... optical signal below the Shannon-Nyquist limit, causing high frequency features to be aliased in the light field. In conventional imaging, such aliasing is undesirable because it irreversibly corrupts the recorded image. However, in light field imaging, aliasing is actually beneficial. In particula ...
Bismuth-doped optical fibers: a challenging active medium
... origin of near-IR Bi luminescence in glass and glass optical fibers.15 The optical properties of Tl-doped alkali halide crystals (KCl, KBr, RbCl and others) were studied extensively in the 1980s. X-ray and cirradiation was shown to produce near-IR-emitting defect centers in these materials (see, e.g ...
... origin of near-IR Bi luminescence in glass and glass optical fibers.15 The optical properties of Tl-doped alkali halide crystals (KCl, KBr, RbCl and others) were studied extensively in the 1980s. X-ray and cirradiation was shown to produce near-IR-emitting defect centers in these materials (see, e.g ...
Optical solitons and its applications Final report Physics 568 (Nonlinear optics)
... installed in transmission lines to regenerate the optical pulse. But they are very expensive and also bottleneck of the transmission speed. On the other hand, solitons do not suffer distortion from nonlinearity and dispersion. If fiber loss can also be compensated with Raman gain of the fiber,3 we w ...
... installed in transmission lines to regenerate the optical pulse. But they are very expensive and also bottleneck of the transmission speed. On the other hand, solitons do not suffer distortion from nonlinearity and dispersion. If fiber loss can also be compensated with Raman gain of the fiber,3 we w ...
Ultrashort-Pulse Generation and Ultrafast Phenomena
... mirrors developed in our group, provide high reflectivity and well controlled dispersion over 400 nm in the case of single mirrors or even over one octave using specially matched mirror pairs. These components are a prerequisite for miniaturized ultrabroadband femtosecond lasers necessary for biomed ...
... mirrors developed in our group, provide high reflectivity and well controlled dispersion over 400 nm in the case of single mirrors or even over one octave using specially matched mirror pairs. These components are a prerequisite for miniaturized ultrabroadband femtosecond lasers necessary for biomed ...
Normal-Incidence Photoemission Electron Microscopy (NI
... hindered by the geometry of the electron optics but can be achieved by inserting a small metallic mirror inside the electron optics column, as close as possible to the optical axis of the electron path. The mirror is located in the back focal plane of the objective lens where it has minimal influenc ...
... hindered by the geometry of the electron optics but can be achieved by inserting a small metallic mirror inside the electron optics column, as close as possible to the optical axis of the electron path. The mirror is located in the back focal plane of the objective lens where it has minimal influenc ...
Optical coherence tomography (OCT): a review
... OCDR was developed originally for finding faults in fiberoptic cables and network components, its ability to probe the eye [8]–[10] and other biological tissues [11], [12] was soon recognized. The superb optical sectioning ability of OCT, which is achieved by exploiting the short temporal coherence ...
... OCDR was developed originally for finding faults in fiberoptic cables and network components, its ability to probe the eye [8]–[10] and other biological tissues [11], [12] was soon recognized. The superb optical sectioning ability of OCT, which is achieved by exploiting the short temporal coherence ...
Heterodynedetected timedomain measurement of I2 predissociation
... signal are determined by products of the same FranckCondon factors it is anticipated that their initial contributions to the dichroic response will be similar in magnitude. The optical dephasing time T2 does not affect such pumpprobe signals. 5 The sample is excited and probed by tunable 30 fs FWHM ...
... signal are determined by products of the same FranckCondon factors it is anticipated that their initial contributions to the dichroic response will be similar in magnitude. The optical dephasing time T2 does not affect such pumpprobe signals. 5 The sample is excited and probed by tunable 30 fs FWHM ...
The influence of growth temperature on CVD grown graphene on SiC
... instance a wafer. Different methods can be used to disperse graphene in a non liquid-phase. By vacuum filtration or drop-casting where a drop of solution is deposed onto a substrate and graphene flakes remain when the solvent evaporates. But the easiest way is to prepare graphene directly onto the ...
... instance a wafer. Different methods can be used to disperse graphene in a non liquid-phase. By vacuum filtration or drop-casting where a drop of solution is deposed onto a substrate and graphene flakes remain when the solvent evaporates. But the easiest way is to prepare graphene directly onto the ...
WHITEPAPER Centration Measurement, Alignment
... edge. In the analysis, the software determines the reference axis from the center of the circumference and the bottom surface. The measured offset of the edge of a highly sensitive lens with a distance the top surface to this axis gives the lens Measurement ...
... edge. In the analysis, the software determines the reference axis from the center of the circumference and the bottom surface. The measured offset of the edge of a highly sensitive lens with a distance the top surface to this axis gives the lens Measurement ...
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Phase Polymorphism of [Mn(DMSO) ](ClO ) Studied by
... rate of 40 K min −1 but after two different “thermal histories”. On curve No 9 we can see the anomaly at TC2 connected with the KII → K0 phase transition, because the sample was earlier cooled fast (30 K min −1 ) to the phase KII. On curve No 10 we can see an anomaly at TC1 connected with the KIa → ...
... rate of 40 K min −1 but after two different “thermal histories”. On curve No 9 we can see the anomaly at TC2 connected with the KII → K0 phase transition, because the sample was earlier cooled fast (30 K min −1 ) to the phase KII. On curve No 10 we can see an anomaly at TC1 connected with the KIa → ...
Attosecond lighthouse driven by sub-two
... distribution of beamlets (vertical axis) plotted for different values of CEP (horizontal axis). To obtain the figure, the spectrum was integrated from 45 to 50 eV (color code) at each spatial position. The data is shown for N2 as a function of the CEP phase which was scanned at ∼6 mrad per step (shot ...
... distribution of beamlets (vertical axis) plotted for different values of CEP (horizontal axis). To obtain the figure, the spectrum was integrated from 45 to 50 eV (color code) at each spatial position. The data is shown for N2 as a function of the CEP phase which was scanned at ∼6 mrad per step (shot ...
Diffracting fractals: new paradigms in linear wave physics
... the same random phases are used in each pane. Red line: pattern from plane wave illumination. Future Applications of Fractal Light In terms of future experimental prospects, this work has greatly widened the scope for potential realization and exploitation of fractal light sources. For example, spat ...
... the same random phases are used in each pane. Red line: pattern from plane wave illumination. Future Applications of Fractal Light In terms of future experimental prospects, this work has greatly widened the scope for potential realization and exploitation of fractal light sources. For example, spat ...
Laser and nonlinear optics
... round resonator components. Using basically round iris apertures (mode apertures) this can also be achieved in the resonator if for example the laser is over-pumped beyond the oscillation threshold. This is advantageous because there are minimum diffraction losses for TEM00 . However, non-optimal ad ...
... round resonator components. Using basically round iris apertures (mode apertures) this can also be achieved in the resonator if for example the laser is over-pumped beyond the oscillation threshold. This is advantageous because there are minimum diffraction losses for TEM00 . However, non-optimal ad ...
Convergence of vector spherical wave expansion
... mulitple sphere scattering, ranging from the study of scattering from aerosols [9] and soot particles [10] to applications like study of light scattering from comet dust [11], involve far-field phenomena – i.e., near-field effects are unimportant. The near-field response of a particle or surface to ...
... mulitple sphere scattering, ranging from the study of scattering from aerosols [9] and soot particles [10] to applications like study of light scattering from comet dust [11], involve far-field phenomena – i.e., near-field effects are unimportant. The near-field response of a particle or surface to ...
Polarization effects and the calibration of a donut beam axial optical
... by employing a liquid crystal retarder. Such an approach would provide a way to apply subtle axial forces without a need to move either the stage or the laser focus, giving rise to a unique, new type of axial optical tweezers. Another application of our results may be to aid in combining single-mole ...
... by employing a liquid crystal retarder. Such an approach would provide a way to apply subtle axial forces without a need to move either the stage or the laser focus, giving rise to a unique, new type of axial optical tweezers. Another application of our results may be to aid in combining single-mole ...
Full-Text PDF
... melanoma diagnosis. Both in vivo and ex vivo strategies have been addressed, the first with the aim to evaluate suspicious lesions prior to excision, avoiding unnecessary biopsies, and the second to support clinical histopathology of biopsies, preventing the risk of false positive and false negative ...
... melanoma diagnosis. Both in vivo and ex vivo strategies have been addressed, the first with the aim to evaluate suspicious lesions prior to excision, avoiding unnecessary biopsies, and the second to support clinical histopathology of biopsies, preventing the risk of false positive and false negative ...