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Information Optics (WIO), 2010 9th Euro-American Workshop on

Date 12-16 July 2010

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Displaying Results 1 - 25 of 48
  • Nanophotonics for information systems

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (166 KB) |  | HTML iconHTML  

    This paper explores the role of nanotechnology with focus on nanophotonics in dielectric, matal, and semiconductor inhomogeneous metamaterials and devices for optical communications, information and signal processing, and sensing. View full abstract»

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  • Single beam computational 3D microscopy

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1216 KB) |  | HTML iconHTML  

    Three dimensional microscopy allows the reconstruction of both phase and amplitude of the object wavefronts. This in turn sheds information on the optical path length profile of the object. Conventionally 3D microscopy is achieved using two beam interference techniques, which requires adjustment of the beam for high quality interference fringes as well as is more prone to external vibrations. Here we discuss a single beam 3D microscopic technique. The technique works by sampling the volume speckle field generated by putting a diffuser in the path of the probe beam passing through the object at several axial planes and computing the complex amplitude of the object wavefront using angular spectrum approach towards scalar diffraction theory. View full abstract»

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  • Compressive imaging for superresolution from a single exposure

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1033 KB) |  | HTML iconHTML  

    Superresolution is typically achieved by taking multiple slightly different exposures. Here we present a superresolution technique that requires only a single exposure. Inspired by the compressive sensing approach that takes advantage of the information redundancy in typical images we show that true superresolution is feasible from a single exposure. The single shot superresolution system is based on the well known double random phase encoding setup which was broadly investigated for its encryption purposes. It is shown that combining double random phase encoding imaging with a compressive sensing based reconstruction technique, can super-resolve both diffraction and geometrical limited resolution imaging. View full abstract»

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  • Optical devices for label-free detection

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (173 KB) |  | HTML iconHTML  

    Innovation in technology routinely leads the way for discovery in chemistry and biology. Most notably, x-ray diffraction data was instrumental in the elucidation of the structure of DNA. To explore the inherent complexity present in biological systems, existing technologies are being pushed to their limits. Once again, scientists are looking to engineers to create innovative solutions to enable their exploration and discovery. Many of the new methods currently being developed focus on increasing the sensitivity of the detection technique by inventing new devices as well as increasing the specificity of the device by engineering synthetic targeting moieties and improved attachment methods. This presentation will focus on new optical technologies with an emphasis on bio/chem-detection applications. Specifically, the experimental and theoretical optical properties of several new optical devices, which were designed for the express purpose of biological and chemical detection, will be discussed. Additionally, biomolecule attachment strategies which can improve both the stability and specificity of the sensor's surface functionalization will be presented. View full abstract»

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  • Miniaturized spectrometer technologies

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (404 KB) |  | HTML iconHTML  

    VTT has developed new MEMS based spectrometer technologies to meet various spectral sensing demands from UV to thermal IR. New inventions have been made to cover wavelength ranges from 350 nm up to 14 μm and to enlarge apertures of devices for increased throughput. This paper reviews VTT's surface micromachined Fabry-Perot interferometer technologies, highlights their key parameters and describes the related instrumentation. View full abstract»

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  • A 180-nm CMOS time-of-flight 3-D image sensor

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (219 KB) |  | HTML iconHTML  

    We report on the design and the experimental characterization of a new 3-D image sensor, based on a new 120-nm CMOS-compatible photo-detector, which features an internal demodulation mechanism effective up to high frequencies. The distance range covered by our proof-of-concept device spans from 1-m to a few meter, and the resolution is about 1-cm. View full abstract»

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  • Chromatic sharing a binary secret within a host image

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2061 KB) |  | HTML iconHTML  

    A type of Probabilistic Visual Secret Sharing Scheme giving non-expansive and meaningful shadow images is here introduced. A binary secret image is shared from any natural color image by transferring the host content to each shadow and to their combination. View full abstract»

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  • 3D wave field reconstruction from intensity-only data: Variational inverse imaging techniques

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (170 KB) |  | HTML iconHTML  

    We present a variational approach to obtain a reconstruction of module and phase of a 3D wave field from intensity-only measurements on two or more sensor planes at different axial positions. The objective functional consists of a data fidelity term and a regularizer. The fidelity term corresponds to the likelihood function derived for the Gaussian noisy observations of the wave field intensities (powers). The wave field reconstruction is framed as a constrained nonlinear optimization with respect to a 2D object wave field and is based on the augmented Lagrangian technique. The main goal is to design an algorithm which is more efficient and accurate than the conventional ones such as the well-known Gerchberg-Saxton algorithms and their multiple modifications. As a further development we discuss a variational approach using a transform domain prior on phase and module of the 2D object wave field. View full abstract»

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  • Capture, processing, and display of real-world 3D objects using digital holography

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (112 KB) |  | HTML iconHTML  

    “Digital holography for 3D and 4D real-world objects' capture, processing, and display” (acronym “Real 3D”) is a research project funded under the Information and Communication Technologies theme of the European Commission's Seventh Framework Programme, and brings together nine participants from academia and industry (see www.digitalholography.eu). This three-year project marks the beginning a long-term effort to facilitate the entry of a new technology (digital holography) into the three-dimensional capture and display markets. Its progress at the end of year 2 is summarised. View full abstract»

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  • 3D Holoscopic video content capture, manipulation and display technologies

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (302 KB) |  | HTML iconHTML  

    The aim of this paper is to provide an overview of the 3D Holoscopic imaging technology which is used employed as part of a three-dimensional imaging system, allowing the display of full colour images with continuous parallax within a wide viewing zone. View full abstract»

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  • Displaying digital holograms of real-world objects on a mobile device using tilt-based interaction

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (390 KB) |  | HTML iconHTML  

    Holography is a well-known technique for sensing and displaying real-world three-dimensional (3D) objects. Reconstructions from digital holograms are typically displayed with regular two-dimensional (2D) screens and therefore lot of the 3D specific information is not passed on to the viewer during the display process. Mobile devices have interesting possibilities for displaying 3D data interactively. In this study, we show how nine viewers evaluated hologram reconstructions with a tilt based display system incorporated into a mobile device. View full abstract»

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  • Liquid crystal spatial light modulators in optical metrology

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2619 KB) |  | HTML iconHTML  

    We provide an overview over recent applications of electronically addressed liquid crystal spatial light modulators (SLM) in the field of optical metrology. Three particular examples are considered: A shear interferometer, a setup for phase retrieval from a set of intensity measurements and a digital holographic sensor which allows for the electronic adaption of the reference wave. View full abstract»

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  • Exploring shot noise and Laser Doppler imagery with Heterodyne Holography

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (519 KB) |  | HTML iconHTML  

    Heterodyne Holography is a variant of Digital Holography, where the optical frequencies of signal and reference arms can be freely adjusted by acousto-optic modulators. Heterodyne Holography is an extremely versatile and reliable holographic technique, which is able the reach the shot noise limit in sensitivity at very low levels of signal. Frequency tuning enables Heterodyne Holography to become a Laser Doppler imaging technique that is able to analyze various kinds of motion. View full abstract»

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  • Invisibility cloaking in weak scattering

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (138 KB) |  | HTML iconHTML  

    We consider invisibility cloaking of a slab object in scalar wave theory within the first-order Born approximation. We show that in the forward direction cloaking is achieved for any object slab and incident field, whereas in the backward direction cloaking is possible at least for self-imaging fields. In both cases the scattering potential of the cloak slab depends on that of the object slab. The method of object-dependent cloaking using weak slab scatterers can be a useful addition to existing cloaking methods, for instance, in atmospheric optics and biophotonics. View full abstract»

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  • On feasibilities of the use of spatial polarization modulation for estimating coherence of optical fields

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1032 KB) |  | HTML iconHTML  

    New approach is proposed for estimating the degree of coherence of optical waves. The possibility of transformation of spatial polarization distribution in measured intensity distribution for estimating the degree of correlation of superposing vector waves linearly polarized at the incidence plane is shown. View full abstract»

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  • Methods for modeling nonparaxial fields

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (139 KB) |  | HTML iconHTML  

    Two techniques for describing the propagation of monochromatic and quasi-monochromatic nonparaxial fields, particularly focused ones, are presented in this talk. The first is based on a nonparaxial generalization of the Wigner function, while the second is based on the definition of a complete orthonormal basis of fields that are closed form solutions of Maxwell's equations and can be regarded as nonparaxial generalizations of Laguerre-Gaussian beams. View full abstract»

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  • Fractal diffraction and focusing properties of binary phase gratings

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (415 KB) |  | HTML iconHTML  

    We observed, that a simple binary phase grating under certain circumstances exhibits pronounced focusing properties. In the paraxial approximation, the on-axis intensity as a function of the grating duty cycle shows a perfect fractal behavior. We discuss the properties of lens scaling and phase binarization in the paraxial, the non-paraxial and the rigorous case. Furthermore, we investigate the optimal focusing conditions for binary phase gratings. Also, possible applications in light concentration, image scanning and wave-front sensing are discussed. View full abstract»

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  • Diffractive control of femtosecond pulses

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (382 KB) |  | HTML iconHTML  

    We make a review of our main results in the field of femtosecond pulses diffracted by diffractive optical elements (DOEs). These results show how amplitude and/or phase DOEs can be used to change the spectral and temporal characteristics of the diffracted pulses. We experimentally demonstrate that shaped pulses diffracted by DOEs are useful in nonlinear optics or chemical applications. View full abstract»

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  • SRS microscopy as a low-invasive 3D bioimaging technique

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (415 KB) |  | HTML iconHTML  

    We introduce stimulated Raman scattering microscopy which allows us to visualize unstained live cells with high sensitivity and high contrast. The shot-noise limited sensitivity can be achieved based on high-frequency lock-in detection using subharmonically synchronized two-color pulses. View full abstract»

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  • Spectral interferometry for the characterization of ultra-short light pulses: SPIRIT Wideband

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (926 KB) |  | HTML iconHTML  

    Recent developments in femtosecond Optics and applications have fostered deep interest on characterization of ultra-short pulses. Unlike iterative methods, spectral shearing interferometry provides complete real-time information of ultra-short optical signals. Spectral interferometry resolved in time (SPIRIT) is a passive and self-referenced characterization technique that has shown to be suitable for a variety of pulse conditions. SPIRIT Wideband represents a novel configuration aimed for the measurement of a few optical cycle pulses. We present the experimental scheme of SPIRIT Wideband and report preliminary experimental results dealing with the characterization of a few femtosecond pulses. View full abstract»

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  • Reconfigurable holographic lithography for photonic structure fabrication

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1085 KB) |  | HTML iconHTML  

    We present a reconfigurable holographic approach for the fabrication of scalable complex structures of 3D photonic crystals (PCs) as well as photonic quasicrystals (PQCs) by a single step optical induction of refractive index modulation. By means of a spatial light modulator (SLM)-assisted approach we generate these reconfigurable and spatially tunable complex structures. The fabricated nonlinear photonic lattices in SBN:Ce photorefractive medium are analyzed by plane wave guiding, momentum space spectroscopy, and far field diffraction pattern imaging. View full abstract»

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  • Qualities of 3-D images

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1100 KB) |  | HTML iconHTML  

    Among various parameters related with the quality of 3-D images, the perceived image depth and depth resolution are the most important parameters in 3-D images because they characterize the image. These parameter values are mostly determined by the stereo camera characteristics. However, the different view image mixing regions in the multiview 3-D imaging methods can improve the parameter values but many image defects can be introduced. View full abstract»

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  • The information content of aberrated- and non aberrated images generated by coherently- or incoherently illuminated objects

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (191 KB) |  | HTML iconHTML  

    The calculation of the information content of an ideal image rests on two different mathematical approaches: The expansion of the field into either the a) coherent modes, or b) into the the sampling functions occurring at the r.h.s. of 1. The coherent mode approach leads to analytical results for a few special cases only, (rectangular- circular apertures), whereas the sampling method can be generalised in such a way that the distribution of the sampling points is known explicitly for al possible shapes of the apertures, thus obtaining optimal sampling!. View full abstract»

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  • Current status of ultra-realistic communication research in NICT

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (425 KB) |  | HTML iconHTML  

    National Institute of Information and Communications Technology (NICT) is conducting ultra-realistic communication research since 2006. The aim of the research is to create a sense of “being there” for natural and realistic communication by developing 3D image/sound technology and multisensory interfaces, and also by investigating human perceptual and cognitive mechanisms in order to develop measurement techniques. For 3D image technology, NICT is focused on developing glasses-free 3D display systems such as with electronic holography, a super multi-view display and a handheld box-shaped 3D display based on the integral photography technique. In this paper, the current status of our research is described. View full abstract»

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  • Progress and perspectives in digital holographic microscopy applied to life sciences

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1713 KB) |  | HTML iconHTML  

    Digital holographic microscopy (DHM) is a technique that allows obtaining, from a single recorded hologram, quantitative phase image of living cell with interferometric accuracy. Specifically the optical phase shift induced by the specimen on the transmitted wave front can be regarded as a powerful endogenous contrast agent, depending on both the thickness and the refractive index of the sample. The quantitative phase images allow the derivation of highly relevant cell parameters, including dry mass density and spatial distribution. Thanks to a decoupling procedure, cell thickness and intracellular refractive index can be measured separately. Consequently, cell morphology, shape as well as cell membrane fluctuations can be accurately monitor. As far as red blood cell are considered, Mean corpuscular volume (MCV) and mean corpuscular hemoglobin concentration (MCHC), two highly relevant clinical parameters, have been measured non-invasively at a single cell level. The DHM nanometric axial and microsecond temporal sensitivities have permitted to measure the red blood cell membrane fluctuations (CMF) over the whole cell surface. In addition, the development of live-cell multimodality microscope combining fluorescence with digital holographic microscopy is presented. The biophysical cell parameters derived from the quantitative phase information in combination with the numerous different specific fluorescent cellular probes allow to this multimodality microscope to address various important issues in cell biology. View full abstract»

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