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Ngene, P. (author), Radeva, T. (author), Westerwaal, R. (author), Schreuders, H. (author), Dam, B. (author)Using the change in the intrinsic optical properties of YMg-based thin films upon exposure to hydrogen, we observe the presence of hydrogen at concentrations as low as 20 ppm just by a change in color. The eye-visible color change circumvents the use of any electronics in this device, thereby making it an inexpensive H2 detector. The detector...conference paper
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Polo, A. (author), Bociort, F. (author), Pereira, S.F. (author), Urbach, H.P. (author)Accurate wavefront aberration measurement are essential for next-generation Extreme Ultraviolet (EUV) Lithography. During the past years several accurate interferometric techniques have been developed, but these techniques have limitation. In this work we discuss a different technique based on the Hartmann Wavefront Sensor that requires no...conference paper
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Booij, S.M. (author), Fähnle, O.W. (author), Meeder, M. (author), Wons, T. (author), Braat, J.J.M. (author)A variation on the fluid jet polishing (FJP) technique, arbitrarily named Jules Verne (JV), will be described in this article. Jules Verne is a glass processing technique that removes material due to the fact that the tool and the surface are in close contact, and a slurry moves in between the tool and the surface. This approach has both...conference paper 2003
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Meeder, M. (author), Mauret, T. (author), Booij, S. (author), Braat, J. (author), Faehnle, O. (author)The possibilities of iTIRM, an in-process surface measurement tool, are explored in this research. Experiments are done to test the applicability for qualifying and optimising finishing processes for optical surfaces. Several optical glasses, different polishing agents and ductile grinding are included in these experiments. It is concluded that...conference paper 2003
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Vdovin, G. (author), De Lima Monteiro, D.W. (author), Akhzar-Mehr, O. (author), Loktev, M. (author), Sakarya, S. (author), Soloviev, O. (author), Sarro, P.M. (author)We present an overview of the results of our recent research in the field of adaptive optical components based on silicon microtechnologies, including membrane deformable mirrors, spatial light modulators, liquid-crystal correctors, wavefront sensors, and both spherical and aspherical micro-optical components. We aim at the realization of...conference paper 2004
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van Driel, E. (author), Bociort, F. (author), Serebriakov, A. (author)We have shown recently that, when certain quite general conditions are satisfied, the set of local minima in the optical merit function space forms a network where they are all connected through optimization paths generated from saddle points having a Morse index of 1. A new global optimization method, that makes use of this linking network to...conference paper 2004
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Serebriakov, A. (author), Maksimov, E. (author), Bociort, F. (author), Braat, J. (author)The subject of birefringence induced by spatial dispersion (BISD), also called intrinsic birefringence, recently became an important issue for 157-nm lithography. For the deep UV range, because of intrinsic absorption, only crystalline materials can be used as optical materials for lens manufacturing. The physical properties of crystals are...conference paper 2004
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Klaassen, T.O. (author), Hovenier, J.N. (author), Fischer, J. (author), Jakob, G. (author), Poglitsch, A. (author), Sternberg, O. (author)A new calorimetric absolute power meter has been developed for THz radiation. This broad band THz power meter measures average power at ambient temperature and pressure, does not use a window, and is insensitive to polarization and time structure of THz radiation. The operation of the power meter is based on the calorimetric method: in order to...conference paper 2004
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Sijbers, J. (author), Den Dekker, A.J. (author)Functional magnetic resonance imaging (fMRI) intends to detect significant neural activity by means of statistical data processing. Commonly used statistical tests include the Student-t test, analysis of variance, and the generalized linear model test. A key assumption underlying these methods is that the data are Gaussian distributed. Moreover,...conference paper 2004
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Jaroszynski, J. (author), Popovic, D. (author), Klapwijk, T.M. (author)Studies of low-frequency resistance noise show that the glassy freezing of the two-dimensional electron system (2DES) in Si in the vicinity of the metal-insulator transition (MIT) persists in parallel magnetic fields B of up to 9 T. At low B, both the glass transition density ng and nc, the critical density for the MIT, increase with B such that...conference paper 2004
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Nazarov, Y.V. (author), Tobiska, J. (author)We discuss how threshold detectors can be used for a direct measurement of the full counting statistics (FCS) of current fluctuations and how to implement Josephson junctions in this respect. We propose a scheme to characterize the full counting statistics from the current dependence of the escape rate measured. We illustrate the scheme with...conference paper 2004
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Dirksen, P. (author), Braat, J. (author), Janssen, A.J.E.M. (author), Leeuwestein, A. (author), Kwinten, H. (author), Van Steenwinckel, D. (author)This study presents an experimental method to determine the resist parameters that are at the origin of a general blurring of the projected aerial image. The resist model includes the effects of diffusion in the horizontal plane and a second cause for image blur that originates from a stochastic variation of the focus parameter. The used...conference paper 2004
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Garini, Y. (author), Kutchoukov, V.G. (author), Bossche, A. (author), Alkemade, P.F.A. (author), Docter, M.W. (author), Verbeek, P.W. (author), Van Vliet, L.J. (author), Young, I.T. (author)Recently, an extraordinary transmission of light through small holes (<200 nm) in a thin metallic film has been described. This phenomenon has been shown to be the result of the photon-plasmon interaction in thin films where a periodic structure (such as a set of holes) is embedded in the film. One of the extraordinary results is that the beam...conference paper 2004
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Müller, M. (author), Schins, J.M. (author), Wurpel, G.W.H. (author)In multiplex CARS microscopy the generated anti-Stokes signal is generated and detected simultaneously over a significant part of the vibrational spectrum. The signal-to-noise ratio of the thus detected spectra is limited only by shot-noise. This principle is demonstrated using a dilution series of 2-propanol in water. It is derived...conference paper 2004
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Shterev, I.D. (author), Lagendijk, I.L. (author), Heusdens, R. (author)Quantization-based watermarking schemes are vulnerable to amplitude scaling. Therefore the scaling factor has to be accounted for either at the encoder, or at the decoder, prior to watermark decoding. In this paper we derive the marginal probability density model for the watermarked and attacked data, when the attack channel consists of...conference paper 2004
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Lichtenauer, J. (author), Setyawan, I. (author), Lagendijk, R. (author)A possible solution to the difficult problem of geometrical distortion of watermarked images in a blind watermarking scenario is to use a template grid in the autocorrelation function. However, the important drawback of this method is that the watermark itself can be estimated and subtracted, or the peaks in the Fourier magnitude spectrum can be...conference paper 2004
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Setyawan, I. (author), Lagendijk, L. (author)We present in this paper the results of our study on the human perception of geometric distortions in images. The ultimate goal of this study is to devise an objective measurement scheme for geometric distortions in images, which should have a good correspondence to human perception of the distortions. The study is divided into two parts. The...conference paper 2004
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- Gamet, J. (author), Pandraud, G. (author), Vonsovici, A.P. (author) journal article 2004
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Young, I.T. (author), Garini, Y. (author), Dietrich, H.R.C. (author), Van Oel, W. (author), Liqui Lung, G. (author)Traditional light sources for fluorescence microscopy have been mercury lamps, xenon lamps, and lasers. These sources have been essential in the development of fluorescence microscopy but each can have serious disadvantages: lack of near monochromaticity, heat generation, cost, lifetime of the light source, and possible distortions due to...conference paper 2004
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Haglmüller, J. (author), Alguel, Y. (author), Mayer, Ch. (author), Matyusshin, V. (author), Bauer, G. (author), Pittner, F. (author), Leitner, A. (author), Aussenegg, F. (author), Schalkhammer, T. (author)Spatially tuned resonant nano-clusters allow high local field enhancement when excited by electromagnetic radiation. A number of phenomena has been described and subsequently applied for the construction of novel nano- and bionano-devices. Easy to manufacture, cost efficient and high throughput transducers using metal cluster resonance...conference paper 2004