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Analysis of optical interferometric displacement detection in nanoelectromechanical systems
Analysis of optical interferometric displacement detection in nanoelectromechanical systems

... interesting regimes of fundamental research.1,2 These nanoelectromechanical systems 共NEMS兲 have recently achieved fundamental resonance frequencies exceeding 1 GHz with quality 共Q兲 factors in the 103 艋 Q 艋 105 range.3 Even at this early stage of their development, it seems clear that NEMS will find ...
Plasmonic Nearfield Scanning Probe with High Transmission
Plasmonic Nearfield Scanning Probe with High Transmission

... focus SPPs on a planar metal surface,33-36 special applications on nonplanar samples request new plasmonic focusing devices design with three-dimensional geometries, such as conic or pyramidal SPP lenses. In this paper, we present a design of conic plasmonic lens integrated on the tapered tip of a N ...
Schlieren Visualization
Schlieren Visualization

... Figure 2: Schematic showing the refraction of light rays by density fields with density and its first, second, and third derivatives constant. The two-dimensional description is easily extended to three dimensions. region where this occurs will appear dark, or as a shadow. Figure 2 illustrates the c ...
V4102176181
V4102176181

... channel WDM optical communication system is presented in order to analyse the variation in FWM power with different core effective, dispersion, channel spacing using different modulation formats. Here we used both binary and duobinary formats. From the obtained results it is concluded that FWM power ...
Focusing of light through a stratified medium: a practical
Focusing of light through a stratified medium: a practical

... from the unaberrated Gaussian focus as horizontal axis. We also computed these curves using Eq. (13) without approximation on the Fresnel reflection coefficients rs,p given by Eq. (14). The difference is below 1%, which justifies the approximation made by Török and Varga to obtain Eq. (15), and as a ...
Acquisition of Multispectral Color Images Using Light
Acquisition of Multispectral Color Images Using Light

... the observation that any color could be matched with a combination of three lights [6]. The idea of this theory was based on human color vision [7]. The retina contains three types of photoreceptor cells (cones) [8]. The light coming from an object or a source interacts with the eye’s photoreceptors ...
Photodetecting Fiber Webs—Y. Fink, J. Joannopoulos
Photodetecting Fiber Webs—Y. Fink, J. Joannopoulos

... (MRSEC) program of the NSF with use of their Shared Experimental Facilities. Modal decomposition in multimode optical waveguides plays an important role in the study of multimode wave propagation by providing insight to the nature of mode interactions due to structural perturbation. Nevertheless, to ...
full article pdf
full article pdf

... or 20X. This low magnification is possible because the system doesn’t need to actually resolve the defects themselves (which may be just microns or less in dimension), but rather, it only needs to image the light scattered from these defects. This pattern of scattered light is easily viewed at lower ...
Modes Effective Refractive Index Difference Measurement
Modes Effective Refractive Index Difference Measurement

... The effective refractive indices of the modes, and effective refractive index differences between the modes are important characteristics for few-mode optical fibers. By measuring the reflection spectrum of the fiber Bragg grating (FBG) fabricated in the few-mode fiber, some discrete information of ...
Diffraction - Purdue Physics
Diffraction - Purdue Physics

... (8510-6 m/s), you can convert digitization times measured on the computer into distances traveled by the photodiode. 2. Read your experimental data into a spreadsheet program and generate a plot of relative intensity vs. position. You must shift your data so that the central maximum coincides with ...
Ab initio calculations of optical properties of silver clusters: Cross
Ab initio calculations of optical properties of silver clusters: Cross

... Since one of the aims here is to compare the applicabilities of the two different approaches, the results presented in this work do not include any shift except for ∼0.3 eV blue-shift to the WIEN2k data to align with the SIESTA results for easier comparison. Our calculations of the extinction coeffi ...
Single Longitudinal Mode Blue-Violet Laser Diode for Data Storage
Single Longitudinal Mode Blue-Violet Laser Diode for Data Storage

... Introduction: Commercially available blue-violet diodes near 405 nm for Blue-ray and HD-DVD disks lase with multiple longitudinal modes and have thus a sub-millimeter coherence length. Optical data storage technologies requiring coherent interference, such as holographic e.g., will benefit from havi ...
4 Lab 1: Scattering and Reflection of Polarized Light
4 Lab 1: Scattering and Reflection of Polarized Light

... of the scattered light from the accelerating charge when observed at a distance r and at an angle θ from the direction of polarization of the incident light is then I(r, θ) = #o c < E 2 >= ...
Mirror contamination in space I: mirror modelling
Mirror contamination in space I: mirror modelling

... Our hypothesis is that both scan mirrors and surface diffusers suffer from a thin absorbing layer of contaminant, which slowly builds up over time. Many previous studies of such contaminant layers that form on mirrors and/or diffusers in space have been performed. However, despite their good quality ...
Tracking Ophthalmic Drugs in the Eye Using Confocal Fluorescence
Tracking Ophthalmic Drugs in the Eye Using Confocal Fluorescence

... but as far as we are aware none of them have yet been used for the purpose of tracking ophthalmic medication in the eye. Furthermore the instruments that are available take a relatively long time to acquire a measurement due to slow image ...
Lamina cribrosa, angles and blebs
Lamina cribrosa, angles and blebs

... Purpose: To investigate whether focal lamina cribrosa (LC) defects are associated with the optic disc deformation in glaucomatous eyes with high myopia Methods: Three-dimensional images of the optic disc obtained using swept-source optical coherence tomography (SS-OCT) and 6 raster scan images cente ...
Light Scattering
Light Scattering

... forward direction (Fig. 4). The amount of diffracted light equals the amount striking the particle, independent of the particle shape and refractive index. Therefore the scattering efficiency2 , Qscat , of large non-absorbing particles is 2. For non-absorbing particles the diffraction constitutes ha ...
IR3215521556
IR3215521556

... In this study, simulation and fabrication of a linear variable optical filter with Fabry-Perot structure is proposed. This filter is designed in order to detect some spectral lines in the range of 610nm to 680nm that Full Width Half Maximum (FWHM) is less than 4nm. We use two transparent materials f ...
BEST OF - Edmund Optics
BEST OF - Edmund Optics

... The transmission properties of a coating are dependent upon the wavelength of light being used, the substrate’s index of refraction, the index of refraction of the coating, the thickness of the coating, and the angle of the incident light. The coating is designed so that the relative phase shift bet ...
Development of an Orbital Angular Momentum Sorter for High
Development of an Orbital Angular Momentum Sorter for High

... Recently, it has been shown that laser light beams can be given a property, orbital angular momentum (OAM), that offers this possibility [2, 3]. In contrast to polarization encoding, the number of possible OAM states of a light beam is limited only by practical considerations. Thus, OAM-encoding can ...
Optical limiting in a periodic materials with relaxational nonlinearity Xue Liu,
Optical limiting in a periodic materials with relaxational nonlinearity Xue Liu,

... wide range of proposed photonic devices [4-8], among which nonlinear PBG optical limiters have emerged as showing potential due to their compact structure and straightforward fabrication process. Earlier work on PBG optical limiters was based on exploiting transverse and longitudinal modulation inst ...
Syllabus
Syllabus

... • “Introduction to aberrations in optical imaging systems,” J Sasian, Cambridge University Press • Roland Shack’s class notes (in the class web site) • http://fp.optics.arizona.edu/sasian/opti518/ Office hours • By email appointment ...
as PDF
as PDF

... wavelength range across the width of the detector array LD. There are a large range of diode array detectors specifically designed for spectrometers. In general, if you need a compact spectrometer you should aim for a short detector (typically 1/4” or 6.4 mm). However, if you require a broad spectra ...
Chapter15 - cloudfront.net
Chapter15 - cloudfront.net

... • If monochromatic light is used, the light from the two slits produces a series of bright and dark parallel bands, or fringes, on a viewing screen. ...
Biology 177: Principles of Modern Microscopy
Biology 177: Principles of Modern Microscopy

... TIRFM versus Confocal Microscopy • Confocal not limited to plane at interface, can go deeper • TIRFM has thinner optical section (100 nm vs 600 nm) • TIRFM, like two photon, only excites sample at focal plane • TIRFM is cheaper to implement than confocal ...
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Optical coherence tomography



Optical coherence tomography (OCT) is an established medical imaging technique that uses light to capture micrometer-resolution, three-dimensional images from within optical scattering media (e.g., biological tissue). Optical coherence tomography is based on low-coherence interferometry, typically employing near-infrared light. The use of relatively long wavelength light allows it to penetrate into the scattering medium. Confocal microscopy, another optical technique, typically penetrates less deeply into the sample but with higher resolution.Depending on the properties of the light source (superluminescent diodes, ultrashort pulsed lasers, and supercontinuum lasers have been employed), optical coherence tomography has achieved sub- micrometer resolution (with very wide-spectrum sources emitting over a ~100 nm wavelength range).Optical coherence tomography is one of a class of optical tomographic techniques. A relatively recent implementation of optical coherence tomography, frequency-domain optical coherence tomography, provides advantages in signal-to-noise ratio, permitting faster signal acquisition. Commercially available optical coherence tomography systems are employed in diverse applications, including art conservation and diagnostic medicine, notably in ophthalmology and optometry where it can be used to obtain detailed images from within the retina. Recently it has also begun to be used in interventional cardiology to help diagnose coronary artery disease. It has also shown promise in dermatology to improve the diagnostic process.
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