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... incoherent MI indeed depends on spatial frequency, as predicted by theory 关4兴. This can be seen even more clearly from Fig. 3, where both the modulated peak intensity and the amplitude of the power spectrum are plotted as a function of the spatial frequency. For the experiments of Figs. 2 and 3, the ...
... incoherent MI indeed depends on spatial frequency, as predicted by theory 关4兴. This can be seen even more clearly from Fig. 3, where both the modulated peak intensity and the amplitude of the power spectrum are plotted as a function of the spatial frequency. For the experiments of Figs. 2 and 3, the ...
Confocal optical microscopy
... 1.3.1. Resolution. Point-spread function—usually. Figure 4 shows the intensity pattern illuminated or observed by a lens at its focal plane. That pattern is called the point-spread function (psf), and defines the resel, the resolution element transverse to the optic axis. For the most common approxi ...
... 1.3.1. Resolution. Point-spread function—usually. Figure 4 shows the intensity pattern illuminated or observed by a lens at its focal plane. That pattern is called the point-spread function (psf), and defines the resel, the resolution element transverse to the optic axis. For the most common approxi ...
Real-Time Multicolor DNA Detection with Chemoresponsive
... Identical gratings were exposed to 100 nM solutions of one or the other type of strand, and diffraction efficiencies were evaluated at several temperatures between 10 and 80 °C. Normalizing for initial signal magnitudes (Figure 5a), we found that increasing the cuvette temperature increases the rela ...
... Identical gratings were exposed to 100 nM solutions of one or the other type of strand, and diffraction efficiencies were evaluated at several temperatures between 10 and 80 °C. Normalizing for initial signal magnitudes (Figure 5a), we found that increasing the cuvette temperature increases the rela ...
Design, fabrication and testing of microlens arrays for sensors and
... deformed in the middle. Reflow microlenses of hL /Ø > 1/2 have already been fabricated [4]. The rapidly increasing spherical aberrations (equation (5)) are a severe restriction for plano-convex lenses of high numerical aperture. The total internal reflection of the refracted light at the lens bounda ...
... deformed in the middle. Reflow microlenses of hL /Ø > 1/2 have already been fabricated [4]. The rapidly increasing spherical aberrations (equation (5)) are a severe restriction for plano-convex lenses of high numerical aperture. The total internal reflection of the refracted light at the lens bounda ...
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... orientation, which then promotes formation of self-assembled linear structures directed along the beam scanning direction. These structures are then shaped into desired patterns via continuous steering of the laser beam with intensity above a certain threshold value (Fig. 1a– c), as described in det ...
... orientation, which then promotes formation of self-assembled linear structures directed along the beam scanning direction. These structures are then shaped into desired patterns via continuous steering of the laser beam with intensity above a certain threshold value (Fig. 1a– c), as described in det ...
Laser Beams and Resonators
... the beam assume a simple form. The complex beam parameter at the waist is purely imaginary -rI ...
... the beam assume a simple form. The complex beam parameter at the waist is purely imaginary -rI ...
Light Microscopy
... Further requirements may include the possibility to spectrally filter or polarize the light, and to influence the color temperature of the illumination. To be able to fulfill the above requirements, the illumination system must first of all be properly assembled and aligned. In practical use, the op ...
... Further requirements may include the possibility to spectrally filter or polarize the light, and to influence the color temperature of the illumination. To be able to fulfill the above requirements, the illumination system must first of all be properly assembled and aligned. In practical use, the op ...
Light propagates in the form of waves
... Since light is an electromagnetic wave, light can be described by the same theoretical principles that govern all forms of electromagnetic radiation. Electromagnetic radiation propagates in the form of two coupled vector waves, an electric-field wave and a magnetic-field wave. Although light is des ...
... Since light is an electromagnetic wave, light can be described by the same theoretical principles that govern all forms of electromagnetic radiation. Electromagnetic radiation propagates in the form of two coupled vector waves, an electric-field wave and a magnetic-field wave. Although light is des ...
lab 1 GEO Optics
... mixture you have produced, the protein solution is placed in an electric field. Proteins with different total charges will drift at different speeds in the solution, and can be separated for further analysis. Your group needs to focus an optical apparatus at known positions within the protein soluti ...
... mixture you have produced, the protein solution is placed in an electric field. Proteins with different total charges will drift at different speeds in the solution, and can be separated for further analysis. Your group needs to focus an optical apparatus at known positions within the protein soluti ...
Propagation and focusing of optical fields
... In other words, the image at z is a low pass filtered representation of the original field at z = 0. The spatial frequencies (kx2 + ky2 ) > k 2 of the original field are filtered out during propagation and the information on high spatial variations gets lost. Hence, there is always a loss of informa ...
... In other words, the image at z is a low pass filtered representation of the original field at z = 0. The spatial frequencies (kx2 + ky2 ) > k 2 of the original field are filtered out during propagation and the information on high spatial variations gets lost. Hence, there is always a loss of informa ...
SRON presentation
... But: “Pure” (geometrical) optical systems would require components much larger than λ. In sub- /mm range diffraction is important, and quasi-optics handles this in a theorectical way. ...
... But: “Pure” (geometrical) optical systems would require components much larger than λ. In sub- /mm range diffraction is important, and quasi-optics handles this in a theorectical way. ...
Airy disk
In optics, the Airy disk (or Airy disc) and Airy pattern are descriptions of the best focused spot of light that a perfect lens with a circular aperture can make, limited by the diffraction of light. The Airy disk is of importance in physics, optics, and astronomy.The diffraction pattern resulting from a uniformly-illuminated circular aperture has a bright region in the center, known as the Airy disk which together with the series of concentric bright rings around is called the Airy pattern. Both are named after George Biddell Airy. The disk and rings phenomenon had been known prior to Airy; John Herschel described the appearance of a bright star seen through a telescope under high magnification for an 1828 article on light for the Encyclopedia Metropolitana:...the star is then seen (in favourable circumstances of tranquil atmosphere, uniform temperature, &c.) as a perfectly round, well-defined planetary disc, surrounded by two, three, or more alternately dark and bright rings, which, if examined attentively, are seen to be slightly coloured at their borders. They succeed each other nearly at equal intervals round the central disc....However, Airy wrote the first full theoretical treatment explaining the phenomenon (his 1835 ""On the Diffraction of an Object-glass with Circular Aperture"").Mathematically, the diffraction pattern is characterized by the wavelength of light illuminating the circular aperture, and the aperture's size. The appearance of the diffraction pattern is additionally characterized by the sensitivity of the eye or other detector used to observe the pattern.The most important application of this concept is in cameras and telescopes. Owing to diffraction, the smallest point to which a lens or mirror can focus a beam of light is the size of the Airy disk. Even if one were able to make a perfect lens, there is still a limit to the resolution of an image created by this lens. An optical system in which the resolution is no longer limited by imperfections in the lenses but only by diffraction is said to be diffraction limited.