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- Latkowski, S. (author), Hansel, A. (author), Bhattacharya, N. (author), De Vries, T. (author), Augustin, L. (author), Williams, K. (author), Smit, M. (author), Bente, E. (author) journal article 2015
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Van den Berg, S.A. (author), Van Eldik, S. (author), Bhattacharya, N. (author)Optical frequency combs have developed into powerful tools for distance metrology. In this paper we demonstrate absolute long distance measurement using a single femtosecond frequency comb laser as a multi-wavelength source. By applying a high-resolution spectrometer based on a virtually imaged phased array, the frequency comb modes are resolved...journal article 2015
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Nemati, M. (author), Loozen, G.B. (author), Van der Wekken, N. (author), Van de Belt, G. (author), Urbach, H.P. (author), Bhattacharya, N. (author), Kenjeres, S. (author)A preliminary comparative measurement between particle imaging velocimetry (PIV) and laser speckle contrast analysis (LASCA) to study pulsatile flow using ventricular assist device in a patient-specific carotid artery phantom is reported. These full-field optical techniques have both been used to study flow and extract complementary parameters....journal article 2015
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Whiting, N. (author), Hu, J. (author), Shah, J.V. (author), Cassidy, M.C. (author), Cressman, E. (author), Millward, N.Z. (author), Menter, D.G. (author), Marcus, C.M. (author), Bhattacharya, P.K. (author)Visualizing the movement of angiocatheters during endovascular interventions is typically accomplished using x-ray fluoroscopy. There are many potential advantages to developing magnetic resonance imaging-based approaches that will allow three-dimensional imaging of the tissue/vasculature interface while monitoring other physiologically-relevant...journal article 2015
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Reyes Reyes, A. (author), Hou, Z. (author), Van Mastrigt, E. (author), Horsten, R.C. (author), De Jongste, J.C. (author), Pijnenburg, M.W. (author), Urbach, H.P. (author), Bhattacharya, N. (author)We present a broadband quantum cascade laser-based spectroscopic system covering the region between 850 and 1250 cm?1. Its robust multipass cavity ensures a constant interaction length over the entire spectral region. The device enables the detection and identification of numerous molecules present in a complex gas mixture without any pre...journal article 2014
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Nemati, M. (author), Presura, C.N. (author), Urbach, H.P. (author), Bhattacharya, N. (author)Continuous health monitoring has become a major theme of our aging society. Portable devices play an important role here. Many optical portable devices are susceptible to motion induced artifacts. We have performed an experimental study for detection of fluid pulsation based on multi-exposure speckle images, in presence of motion induced...journal article 2014
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Nemati, M. (author), Wijshoff, R.W.C.G.R. (author), Stijnen, J.M.A. (author), Van Tuijl, S. (author), Bergmans, J.W.M. (author), Bhattacharya, N. (author), Urbach, H.P. (author)We have performed an in vitro and in vivo study, based on laser speckle contrast analysis, to detect fluid pulsation in the presence of artifacts caused by the relative motion between the sample and the illumination source. We observe that the pulsation signal is clearly detectable for a range of motion amplitudes and oscillation frequencies;...journal article 2013
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Cui, M. (author), Zeitouny, M.G. (author), Bhattacharya, N. (author), Van den Berg, S.A. (author), Urbach, H.P. (author)We experimentally demonstrate long distance measurements with a femtosecond frequency comb laser using dispersive interferometry. The distance is derived from the unwrapped spectral phase of the dispersed interferometer output and the repetition frequency of the laser. For an interferometer length of 50 m this approach has been compared to an...journal article 2011
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Zeitouny, M.G. (author), Cui, M. (author), Janssen, A.J. (author), Bhattacharya, N. (author), Van den Berg, S.A. (author), Urbach, H.P. (author)We investigate general properties of the interferograms from a frequency comb laser in a non-linear dispersive medium. The focus is on interferograms at large delay distances and in particular on their broadening, the fringe formation and shape. It is observed that at large delay distances the interferograms spread linearly and that its shape is...journal article 2011
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Zeitouny, M.G. (author), Cui, M. (author), Bhattacharya, N. (author), Urbach, H.P. (author), Van den Berg, S.A. (author), Janssen, A.J.E.M. (author)We have investigated correlation patterns generated by a frequency-comb laser in a dispersive unbalanced Michelson interferometer and apply the developed formalism to the case of distance metrology. Due to group velocity dispersion, the position of the brightest fringe of the correlation pattern, which is used for distance determination, cannot...journal article 2010
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Cui, M. (author), Zeitouny, M.G. (author), Bhattacharya, N. (author), Van den Berg, S.A. (author), Urbach, H.P. (author), Braat, J.J.M. (author)We experimentally demonstrate that a femtosecond frequency comb laser can be applied as a tool for longdistance measurement in air. Our method is based on the measurement of cross correlation between individual pulses in a Michelson interferometer. From the position of the correlation functions, distances of up to 50 m have been measured. We...journal article 2009
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Cui, M. (author), Bhattacharya, N. (author), Urbach, H.P. (author), Van den berg, S.A. (author)We experimentally demonstrate that a stabilized femtosecond frequency comb can be applied as a tool for distance measurement. The scheme is based on optical interference between individual pulses in a Michelson type interferometer. The cross-correlation functions between individual pulses with a distance of around 15 meter and 30 meter are...conference paper 2008
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Zeitouny, M. (author), Bhattacharya, N. (author), Urbach, H.P. (author), Van den Berg, S.A. (author)Frequency and distance metrology have been revolutionized with the arrival of stabilized frequency comb lasers. We discuss several aspects of distance metrology specially the contribution of the dispersion in by air.conference paper 2008
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- Somers, P.A.A.M. (author), Bhattacharya, N. (author) journal article 2007
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Ahn, C.H. (author), Bhattacharya, A. (author), Di Ventra, M. (author), Eckstein, J.N. (author), Frisbie, C.D. (author), Gershenson, M.E. (author), Goldman, A.M. (author), Inoue, I.H. (author), Mannhart, J. (author), Millis, A.J. (author), Morpurgo, A.F. (author), Natelson, D. (author), Triscone, J.M. (author)Application of the field-effect transistor principle to novel materials to achieve electrostatic doping is a relatively new research area. It may provide the opportunity to bring about modifications of the electronic and magnetic properties of materials through controlled and reversible changes of the carrier concentration without modifying the...journal article 2006
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Somers, P.A.A.M. (author), Bhattacharya, N. (author)Phase stepping algorithms are mostly based on three or more interferograms that can either be acquired sequentially, involving some temporal phase stepping mechanism, or in parallel. When a phase step is applied between acquisitions, object phase changes may cause phase errors when calculating phase. A new system that allows the object to change...conference paper 2006
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Vuelban, E.M. (author), Bhattacharya, N. (author), Braat, J.M. (author)Recently, a new type of liquid based deformable mirror has been proposed and demonstrated. The device consists of an array of vertically oriented open capillary channels immersed in a pool of two immiscible liquids and a freefloating reflective membrane, which serves as the reflecting surface. Liquid surface and membrane deformations are...conference paper 2006
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Vuelban, E.M. (author), Bhattacharya, N. (author), Braat, J.J.M. (author)We propose and demonstrate a novel liquid deformable mirror, based on electrocapillary actuation, for highorder wavefront correction. The device consists of a two-dimensional array of vertically oriented microchannels filled with two immiscible liquids, an aqueous electrolyte, and a viscous dielectric liquid, where the dielectric liquid...journal article 2006
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Swinkels, B.L. (author), Bhattacharya, N. (author), Braat, J.J.M. (author)Absolute distance measurements can be performed with an interferometric method that uses only a single tunable laser. This method has one major drawback, because a small target movement of the order of one wavelength during a measurement will be interpreted as a movement of one synthetic wavelength. This effect is usually mitigated by adding a...journal article 2005
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Vuelban, E.M. (author), Bhattacharya, N. (author), Braat, J. (author)We propose and demonstrate a novel liquid based deformable mirror (LDM). The proposed LDM consists of an array of vertically oriented open capillary channels immersed in a pool of two immiscible liquids. A free-floating thin reflective membrane serves as the reflecting surface. By means of jet action, membrane deformation is induced. The control...conference paper 2005
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