L. Koechlin Optical principles of diffraction focusing
... No mirror, no lens : just vacuum and opaque material (except near focal plane). broad spectral domain: λ = 90nm (UV) to (IR) 25μm High angular resolution: as a solid aperture the size of the array. High dynamic range: 108 on compact objects, more with coronagraphy & postprocessing. Large tolerance i ...
... No mirror, no lens : just vacuum and opaque material (except near focal plane). broad spectral domain: λ = 90nm (UV) to (IR) 25μm High angular resolution: as a solid aperture the size of the array. High dynamic range: 108 on compact objects, more with coronagraphy & postprocessing. Large tolerance i ...
Experimental investigation of the propagation properties of bloch
... to be transparent at the operating wavelength. Moreover, multilayers are wavelength scalable and may be designed to sustain BSWs at a broad range of wavelengths from nearUV to IR [5]. Since the position of the surface mode within the photonics band gap can be engineered by tailoring the thickness of ...
... to be transparent at the operating wavelength. Moreover, multilayers are wavelength scalable and may be designed to sustain BSWs at a broad range of wavelengths from nearUV to IR [5]. Since the position of the surface mode within the photonics band gap can be engineered by tailoring the thickness of ...
IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE) ISSN(e) : www.iosrjournals.org
... filters to select the desired neutron wavelength. Some parts of the setup may also be movable.The technique is most commonly performed as powder diffraction, which only requires a polycrystalline powder. For single crystal work, the crystals must be much larger than those used in X-ray crystallograp ...
... filters to select the desired neutron wavelength. Some parts of the setup may also be movable.The technique is most commonly performed as powder diffraction, which only requires a polycrystalline powder. For single crystal work, the crystals must be much larger than those used in X-ray crystallograp ...
Aberrations
... So far, we haven’t asked what the functional form of W might be. If we restrict ourselves to rotationally symmetric optical systems, we can limit the possible forms W might take. If we assume a 2-Dimensional polynomial form for W, and eliminate all terms and combination of terms that are not rotatio ...
... So far, we haven’t asked what the functional form of W might be. If we restrict ourselves to rotationally symmetric optical systems, we can limit the possible forms W might take. If we assume a 2-Dimensional polynomial form for W, and eliminate all terms and combination of terms that are not rotatio ...
Generation of diffractive optical elements onto a photopolymer using a
... microoptics fabrication technologies [2][4][3], such as lithography, diamong turning, direct laser writing, are available to produce high quality passive DOEs. Low cost schemes have also been proposed and analyzed in the literature, such as production of computer-generated phase holograms using grap ...
... microoptics fabrication technologies [2][4][3], such as lithography, diamong turning, direct laser writing, are available to produce high quality passive DOEs. Low cost schemes have also been proposed and analyzed in the literature, such as production of computer-generated phase holograms using grap ...
optical coherence tomography
... Tomography is based on the reconstruction of cross-sectional images of an object from its projections. While the basic mathematics was described as early as 1917 by J. Radon,1 the implementation of this principle in medical imaging took a rather long time and led to a great number of configurations, ...
... Tomography is based on the reconstruction of cross-sectional images of an object from its projections. While the basic mathematics was described as early as 1917 by J. Radon,1 the implementation of this principle in medical imaging took a rather long time and led to a great number of configurations, ...
Section 4 Diffraction_handbook of optics
... coefficient A stands for the amplitude of the wave at unit distance from the source P0 . At a later time this wave will have progressed to assume a position passing through a point of observation P with radius, r0 1 b. Fresnel zone construction on the initial wave offers a way to obtain the wave in ...
... coefficient A stands for the amplitude of the wave at unit distance from the source P0 . At a later time this wave will have progressed to assume a position passing through a point of observation P with radius, r0 1 b. Fresnel zone construction on the initial wave offers a way to obtain the wave in ...
A spatial light modulator for ion trapping experiments
... While this seems like a topic that only spies would be interested in, other problems are of more general interest. Calculating properties of solids, such as magnetism and superconductivity is of great interest for material sciences, however today systems of no more than a few dozen atoms or electron ...
... While this seems like a topic that only spies would be interested in, other problems are of more general interest. Calculating properties of solids, such as magnetism and superconductivity is of great interest for material sciences, however today systems of no more than a few dozen atoms or electron ...
Final Exam Review Slides
... center is at a distance a from the center of the sphere. What is the electric field inside the ...
... center is at a distance a from the center of the sphere. What is the electric field inside the ...
Composite THz materials using aligned metallic
... size of the features making a composite is much smaller than the wavelength of light, then such a composite can be thought of as a homogeneous (however, anisotropic) medium [3,4] that can exhibit various unusual properties. One possible implementation of a THz metamaterial is in the form of the peri ...
... size of the features making a composite is much smaller than the wavelength of light, then such a composite can be thought of as a homogeneous (however, anisotropic) medium [3,4] that can exhibit various unusual properties. One possible implementation of a THz metamaterial is in the form of the peri ...
Tolerancing Optical Systems
... Surface defects are always present at some level in optical surfaces. These consist of scratches, digs (little pits), sleeks (tiny scratches), edge chips, and coating blemishes. In most cases these defects are small and they do not affect system performance. Hence they are often called “beauty speci ...
... Surface defects are always present at some level in optical surfaces. These consist of scratches, digs (little pits), sleeks (tiny scratches), edge chips, and coating blemishes. In most cases these defects are small and they do not affect system performance. Hence they are often called “beauty speci ...
Computer-generated holograms of three
... be constructed by the CGH can be represented in the computer by mathematical or graphical descriptions, or by their spatial samples. The physical interference between light waves is replaced by mathematical computation. However, synthesizing CGHs of 3D images is usually a heavy computational task. T ...
... be constructed by the CGH can be represented in the computer by mathematical or graphical descriptions, or by their spatial samples. The physical interference between light waves is replaced by mathematical computation. However, synthesizing CGHs of 3D images is usually a heavy computational task. T ...
Signal-to-Signal-to-Noise-Ratio of Full-Field Fourier
... OCT configurations. Here for simplicity we describe 3F-OCT in the transmission mode (extendable to reflection mode). Our optical source is launched into a fiber-optic coupler which splits the light into the sample and reference arms. A sample is located at the front focal plane of a Fourier lens, th ...
... OCT configurations. Here for simplicity we describe 3F-OCT in the transmission mode (extendable to reflection mode). Our optical source is launched into a fiber-optic coupler which splits the light into the sample and reference arms. A sample is located at the front focal plane of a Fourier lens, th ...
96-ws9-reg-temp - School of Physics
... a. The more coils a spring has the easier it is to stretch it. The shorter spring, with only half as many coils, will not stretch as much as the longer spring when the same force is applied to it by hanging a mass on it. b. The spring constant, k, is given by the extension, x, for a given applied f ...
... a. The more coils a spring has the easier it is to stretch it. The shorter spring, with only half as many coils, will not stretch as much as the longer spring when the same force is applied to it by hanging a mass on it. b. The spring constant, k, is given by the extension, x, for a given applied f ...
evanescent wave based biosensors
... A wave (called the refracted wave) also arises on the other side of the interface where the reflection occurs. The three arrows in the sketch at left represent the 3 wave vectors for the incident, reflected and refracted waves. All 3 wave vectors lie in the same plane (the plane of incidence). The a ...
... A wave (called the refracted wave) also arises on the other side of the interface where the reflection occurs. The three arrows in the sketch at left represent the 3 wave vectors for the incident, reflected and refracted waves. All 3 wave vectors lie in the same plane (the plane of incidence). The a ...
Waves and Optics - School of Physics
... a. The more coils a spring has the easier it is to stretch it. The shorter spring, with only half as many coils, will not stretch as much as the longer spring when the same force is applied to it by hanging a mass on it. b. The spring constant, k, is given by the extension, ∆x, for a given applied f ...
... a. The more coils a spring has the easier it is to stretch it. The shorter spring, with only half as many coils, will not stretch as much as the longer spring when the same force is applied to it by hanging a mass on it. b. The spring constant, k, is given by the extension, ∆x, for a given applied f ...
Design and construction of a refracting telescope
... Any incident ray travelling parallel to the principal axis of a converging lens will refract through the lens and travel through a focal point on the opposite side of the lens Any incident ray travelling through the focal point on the way to the lens will refract through the lens and travel parallel ...
... Any incident ray travelling parallel to the principal axis of a converging lens will refract through the lens and travel through a focal point on the opposite side of the lens Any incident ray travelling through the focal point on the way to the lens will refract through the lens and travel parallel ...
Microscope Basics
... Not many improvements were made until the 1850’s when several inventors in Europe and America made vast improvements. From this time frame, modern compound and stereo microscopes have changed very little. In the early 1930’s the first electron beam microscopes were developed which were a breakthroug ...
... Not many improvements were made until the 1850’s when several inventors in Europe and America made vast improvements. From this time frame, modern compound and stereo microscopes have changed very little. In the early 1930’s the first electron beam microscopes were developed which were a breakthroug ...
Nonlinear multiresolution: a shape-from-shading example - CS
... of shape from shading, the following assumption should be true. Let l o be the gray level image of the surface SO. Reducing the resolution of 10 into I1 should yield the same image as the image of surface SI,which is obtained by reducing the resolution of surface SO.In earlier work, Terzopoulos [9] ...
... of shape from shading, the following assumption should be true. Let l o be the gray level image of the surface SO. Reducing the resolution of 10 into I1 should yield the same image as the image of surface SI,which is obtained by reducing the resolution of surface SO.In earlier work, Terzopoulos [9] ...
Negative Refractive Index Materials
... could be characterized by negative values of and provided a breakthrough for NIM research. The first metamaterials consisted of copper rings and straight wires, disposed in a strict geometric order (see Chapter 5). The straight wires, in essence, are the antennas that interact with the electric fi ...
... could be characterized by negative values of and provided a breakthrough for NIM research. The first metamaterials consisted of copper rings and straight wires, disposed in a strict geometric order (see Chapter 5). The straight wires, in essence, are the antennas that interact with the electric fi ...
The effect of detector size on the signal-to
... suitable for polarised light studies since it possesses an infinite extinction coefficient if perfect polars and a vanishingly small pinhole are used (Wilson & Juškaitis, 1995). The extinction coefficient, which is defined as the ratio of the intensity of the light transmitted between parallel pola ...
... suitable for polarised light studies since it possesses an infinite extinction coefficient if perfect polars and a vanishingly small pinhole are used (Wilson & Juškaitis, 1995). The extinction coefficient, which is defined as the ratio of the intensity of the light transmitted between parallel pola ...
Design of a spherical focal surface using close
... mounted on a flexible membrane [3]. The substrate is then deformed by pressing with a shaped rod. Similar systems where a flat sensor pattern is overlaid onto a flexible substrate are viable options for small-scale, low resolution imagers [4,5]. However, limitations in fine control of surface profil ...
... mounted on a flexible membrane [3]. The substrate is then deformed by pressing with a shaped rod. Similar systems where a flat sensor pattern is overlaid onto a flexible substrate are viable options for small-scale, low resolution imagers [4,5]. However, limitations in fine control of surface profil ...
Design, fabrication and testing of microlens arrays for sensors and
... used to test the uniformity of a lens array (Ø = 190 µm, f = 500 µm). One mirror of the interferometer was set in the focal plane of the lenses. Figure 8(c) shows an interferogram. The measured uniformity of the focal length was better than 1%. 4.2.3. Mach–Zehnder interferometer. A Mach–Zehnder inte ...
... used to test the uniformity of a lens array (Ø = 190 µm, f = 500 µm). One mirror of the interferometer was set in the focal plane of the lenses. Figure 8(c) shows an interferogram. The measured uniformity of the focal length was better than 1%. 4.2.3. Mach–Zehnder interferometer. A Mach–Zehnder inte ...
The Microscope in a Computer: Image Synthesis from Three
... numerical electromagnetic simulation methods considered in this paper operate on deterministic field values that are known precisely in space and time. Numerical solutions of differential equations that operate directly on statistically averaged values [such as the radiative transfer equation (Ishim ...
... numerical electromagnetic simulation methods considered in this paper operate on deterministic field values that are known precisely in space and time. Numerical solutions of differential equations that operate directly on statistically averaged values [such as the radiative transfer equation (Ishim ...
Gradient Index Optics at DARPA - Institute for Defense Analyses
... systems with spherical glass surfaces and fixed optical properties. Recently, however, new materials and lens designs have been developed, inspired by properties of biological eyes. Materials with a gradient index (GRIN) allow the development of compact systems that have high focusing power while co ...
... systems with spherical glass surfaces and fixed optical properties. Recently, however, new materials and lens designs have been developed, inspired by properties of biological eyes. Materials with a gradient index (GRIN) allow the development of compact systems that have high focusing power while co ...
Superlens
A practical superlens, or super lens, is a lens which uses metamaterials to go beyond the diffraction limit. The diffraction limit is a feature of conventional lenses and microscopes that limits the fineness of their resolution. Many lens designs have been proposed that go beyond the diffraction limit in some way, but there are constraints and obstacles involved in realizing each of them.