FRACTAL-LIKE SQUARE LATTICES OF AIR HOLES H. T. Hattori
... Figure 5. (a) Basic configuration to assess the transmission properties of photonic crystals (b) Transmission of a square lattice of air holes. Figure 5(b) shows the transmission spectrum of a square lattice of air holes with r1 = r2 = 120 nm and Λ = 300 nm. There is a bandgap region between 1075 nm ...
... Figure 5. (a) Basic configuration to assess the transmission properties of photonic crystals (b) Transmission of a square lattice of air holes. Figure 5(b) shows the transmission spectrum of a square lattice of air holes with r1 = r2 = 120 nm and Λ = 300 nm. There is a bandgap region between 1075 nm ...
A simple approach to phase holography
... It is quite common in the undergraduate laboratory to prepare phase holograms by bleaching silver halide1 or through the use of photopolymers.2 Students find the experiments interesting and rewarding not least because of the remarkably life-like three-dimensional 共3-D兲 images that can be obtained. H ...
... It is quite common in the undergraduate laboratory to prepare phase holograms by bleaching silver halide1 or through the use of photopolymers.2 Students find the experiments interesting and rewarding not least because of the remarkably life-like three-dimensional 共3-D兲 images that can be obtained. H ...
unit 29: reflection and mirrors
... reflection where the angle is measured from the normal to the reflecting surface. The rays reflected from a plane or convex mirror will not cross, but if one extends them back in a straight line to the other side of the mirror, these extensions will cross at a point called the virtual image of the s ...
... reflection where the angle is measured from the normal to the reflecting surface. The rays reflected from a plane or convex mirror will not cross, but if one extends them back in a straight line to the other side of the mirror, these extensions will cross at a point called the virtual image of the s ...
Ultra-thin plasmonic optical vortex plate based on phase
... Traditional optical components that control the wavefront of light beams rely on the phase accumulated while light propagates in materials.1 This concept has been extensively used to create a variety of optical components such as lenses, prisms, gratings, and spiral phase plates. Spatial light modul ...
... Traditional optical components that control the wavefront of light beams rely on the phase accumulated while light propagates in materials.1 This concept has been extensively used to create a variety of optical components such as lenses, prisms, gratings, and spiral phase plates. Spatial light modul ...
The Theory of the Rainbow
... The speed of light in a vacuum is in variant; indeed. it is one of the funda mental constants of nature. The speed of light in a material medium. on the other hand. is determined by the proper ties of the medium. The ratio of the speed of light in a vacuum to the speed in a substance is called th ...
... The speed of light in a vacuum is in variant; indeed. it is one of the funda mental constants of nature. The speed of light in a material medium. on the other hand. is determined by the proper ties of the medium. The ratio of the speed of light in a vacuum to the speed in a substance is called th ...
Temporal evolution of the angular response of a PVA/acrylamide photopolymer
... recording without requiring post-exposure processing steps. This real-time recording characteristic elimates the need for complicated development procedures, and is particularly useful for applications such as holographic memories. However, this characteristic prevents us from measuring the angular ...
... recording without requiring post-exposure processing steps. This real-time recording characteristic elimates the need for complicated development procedures, and is particularly useful for applications such as holographic memories. However, this characteristic prevents us from measuring the angular ...
egg nebula - IOPscience
... four-step spiral dither was used with nonintegral (20.5) pixel offsets to better sample the point-spread function and remove bad pixels and other artifacts. The images were reduced with CALNICA in the STSDAS package of IRAF. Residual artifacts are caused by (1) preflight thermal vacuum flats that we ...
... four-step spiral dither was used with nonintegral (20.5) pixel offsets to better sample the point-spread function and remove bad pixels and other artifacts. The images were reduced with CALNICA in the STSDAS package of IRAF. Residual artifacts are caused by (1) preflight thermal vacuum flats that we ...
IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE)
... Optical tweezers use light to trap, manipulate and position particles in three dimensions without any mechanical touch. By using the various effects of light, dielectric particles ranging in size from submicron to hundreds of microns can be successfully held by a beam (or beams) of light. Optical tw ...
... Optical tweezers use light to trap, manipulate and position particles in three dimensions without any mechanical touch. By using the various effects of light, dielectric particles ranging in size from submicron to hundreds of microns can be successfully held by a beam (or beams) of light. Optical tw ...
Sub-100 nm lithography using ultrashort wavelength of surface plasmons
... hole array [Fig. 3(a)] exhibits significant enhancement of the field strength and tight confinement of the field distribution compared with that of the aluminum hole array [Fig. 3(b)]. This offers the opportunity to further extend the resolution limit of the plasmonic lithography. The hole diameter, ...
... hole array [Fig. 3(a)] exhibits significant enhancement of the field strength and tight confinement of the field distribution compared with that of the aluminum hole array [Fig. 3(b)]. This offers the opportunity to further extend the resolution limit of the plasmonic lithography. The hole diameter, ...
Optical Fibers
... higher data rates than other forms of communications. The fine glass fiber is relatively flexible and can be used to guide optical signals over distances of kilometers without the necessity of perfect alignment between source and detector. This significantly increases the applications of optical com ...
... higher data rates than other forms of communications. The fine glass fiber is relatively flexible and can be used to guide optical signals over distances of kilometers without the necessity of perfect alignment between source and detector. This significantly increases the applications of optical com ...
Beam shaping based on intermediate zone diffraction of a micro
... 3. Performance of a micro-slit/hole lens for beam forming We further evaluated the beam focusing of the 0th-order maxima for wider slits of interest (up to ten wavelengths). It was found, as shown in Fig. 5, that the focal length (distance of maxima to slit screen) can extend to a range of tens of w ...
... 3. Performance of a micro-slit/hole lens for beam forming We further evaluated the beam focusing of the 0th-order maxima for wider slits of interest (up to ten wavelengths). It was found, as shown in Fig. 5, that the focal length (distance of maxima to slit screen) can extend to a range of tens of w ...
Paper
... With the realization of coherent, laserlike atoms in the form of Bose-Einstein condensates it has become possible to explore matter-wave amplification, a process in which the number of atoms in a quantum state is amplified due to bosonic stimulation. Stimulation has been observed in the formation of ...
... With the realization of coherent, laserlike atoms in the form of Bose-Einstein condensates it has become possible to explore matter-wave amplification, a process in which the number of atoms in a quantum state is amplified due to bosonic stimulation. Stimulation has been observed in the formation of ...
1 CHAPTER 4 OPTICAL ABERRATIONS 4.1 Introduction We have
... The angle of incidence of the ray at R is 25.442 358 40 degrees to the normal, and the angle of refraction is 43.421 850 83 degrees. The net result of this is that there is a short linear “image” at T perpendicular to the tangential plane, and a short linear “image” at S perpendicular to the sagitta ...
... The angle of incidence of the ray at R is 25.442 358 40 degrees to the normal, and the angle of refraction is 43.421 850 83 degrees. The net result of this is that there is a short linear “image” at T perpendicular to the tangential plane, and a short linear “image” at S perpendicular to the sagitta ...
Note
... points on the surface share the same disturbance. In the case of light waves, the “disturbance” is the electromagnetic field, so the electric field has the same magnitude and direction at every point on the wave front. Say that at t = 0 the wave front has a shape, or profile, . Then at a later tim ...
... points on the surface share the same disturbance. In the case of light waves, the “disturbance” is the electromagnetic field, so the electric field has the same magnitude and direction at every point on the wave front. Say that at t = 0 the wave front has a shape, or profile, . Then at a later tim ...
Through the Looking Glass
... containing the phase information. Any physical process that alters the refractive index in a region of a material will, in turn, alter the phase of any light passing through that region. The trick, of course, is to alter the refractive index in just the right way so that the material scatters the li ...
... containing the phase information. Any physical process that alters the refractive index in a region of a material will, in turn, alter the phase of any light passing through that region. The trick, of course, is to alter the refractive index in just the right way so that the material scatters the li ...
Birefringence
Birefringence is the optical property of a material having a refractive index that depends on the polarization and propagation direction of light. These optically anisotropic materials are said to be birefringent (or birefractive). The birefringence is often quantified as the maximum difference between refractive indices exhibited by the material. Crystals with asymmetric crystal structures are often birefringent, as are plastics under mechanical stress.Birefringence is responsible for the phenomenon of double refraction whereby a ray of light, when incident upon a birefringent material, is split by polarization into two rays taking slightly different paths. This effect was first described by the Danish scientist Rasmus Bartholin in 1669, who observed it in calcite, a crystal having one of the strongest birefringences. However it was not until the 19th century that Augustin-Jean Fresnel described the phenomenon in terms of polarization, understanding light as a wave with field components in transverse polarizations (perpendicular to the direction of the wave vector).