Searched for: faculty%3A%22Applied%255C%252BSciences%22
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Ullien, D. (author), Harmsma, P.J. (author), Abdulla, S.M.C. (author), De Boer, B.M. (author), Bosma, D. (author), Sudhölter, E.J.R. (author), De Smet, L.C.P.M. (author), Jager, W.F. (author)
Silicon optical microring resonators (MRRs) are sensitive devices that can be used for biosensing. We present a novel biosensing platform based on the application of polyelectrolyte (PE) layers on such MRRs. The top PE layer was covalently labeled with biotin to ensure binding sites for antibodies via a streptavidin-biotin binding scheme....
journal article 2014
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De Boer, W.D.A.M. (author), Trinh, M.T. (author), Timmerman, D. (author), Schins, J.M. (author), Siebbeles, L.D.A. (author), Greogorkiewicz, T. (author)
We report on investigations of optical generation of carriers in Si nanocrystals embedded in SiO2 matrix by time-resolved induced absorption technique. Results obtained for excitation below and above twice the bandgap energy h??<?2Eg and h??>?2Eg show very similar decay characteristics (within ?resolution ? 100 fs). When intensity of the signal...
journal article 2011
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De Boer, R. (author), Schaap, M. (author), Van der Lijn, F. (author), Vrooman, H.A. (author), De Groot, M. (author), Van der Lugt, A. (author), Ikram, M.A. (author), Vernooij, M.W. (author), Breteler, M.M.B. (author), Niessen, W.J. (author)
Diffusion MRI can be used to study the structural connectivity within the brain. Brain connectivity is often represented by a binary network whose topology can be studied using graph theory. We present a framework for the construction of weighted structural brain networks, containing information about connectivity, which can be effectively...
journal article 2010
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Xu, M. (author), De Boer, D.K.G. (author), Van Heesch, C.M. (author), Wachters, A.J.H. (author), Urbach, H.P. (author)
Polarization gratings can be realized by polarization holographic recording in photoanisotropic materials. In this paper, we study two types of polarization gratings. One is recorded with two orthogonally circularly (OC) polarized beams and the other one with two orthogonally linearly (OL) polarized beams. The interference of both cases is...
journal article 2010
document
Sluijter, M. (author), Xu, M. (author), Urbach, H.P. (author), De Boer, D.K.G. (author)
We study the applicability of geometrical optics to inhomogeneous dielectric nongyrotropic optically anisotropic media typically found in in-plane liquid-crystal configurations with refractive indices no=1.5 and ne=1.7. To this end, we compare the results of advanced ray- and wave-optics simulations of the propagation of an incident plane wave...
journal article 2010
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Seravalli, E. (author), De Boer, M.R. (author), Geurink, F. (author), Huizinga, J. (author), Kreuger, R. (author), Schippers, J.M. (author), Van Eijk, C.W.E. (author)
A two-dimensional position-sensitive dosimetry system based on a scintillating gas detector is being developed for pre-treatment verification of dose distributions in particle therapy. The dosimetry system consists of a chamber filled with an Ar/CF4 scintillating gas mixture, inside which two gas electron multiplier (GEM) structures are mounted ...
journal article 2009
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Sluijter, M. (author), Herzog, A. (author), De Boer, D.K.G. (author), Krijn, M.P.C.M. (author), Urbach, P.H. (author)
For the first time, to our knowledge, we report ray-tracing simulations of an advanced liquid-crystal gradientindex lens structure for application in switchable two-dimensional/three-dimensional (3D) autostereoscopic displays. We present ray-tracing simulations of the angular-dependent lens action. From the results we conclude that the lens...
journal article 2009
document
Sluijter, M. (author), De Boer, D.K.G. (author), Urbach, H.P. (author)
Firm evidence of the biaxial nematic phase in liquid crystals, not induced by a magnetic or electric field, has been established only recently. The discovery of these biaxially anisotropic liquid crystals has opened up new areas of both fundamental and applied research. The advances in biaxial liquid crystal-related topics call for a good...
journal article 2009
document
Sluijter, M. (author), De Boer, D.K.G. (author), Urbach, H.P. (author), Strömer, J. (author), Cennini, G. (author)
conference paper 2009
document
Sluijter, M. (author), De Boer, D.K.G. (author), Urbach, H.P. (author)
We present simulations of a novel liquid-crystal-based electro-optical device that enables a switching effect owing to a backreflection phenomenon. In the simulations, we exploit the optical properties of a liquid-crystal layer with a Freédericksz alignment in an unconventional way. The resulting switching effect of the proposed optical design...
journal article 2008
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Xu, M. (author), De Sio, L. (author), Caputo, R. (author), Umeton, C.P. (author), Wachters, A.J.H. (author), De Boer, D.K.G. (author), Urbach, H.P. (author)
Recently, a novel holographic diffraction grating made of polymer slices alternated to homogeneous films of nematic liquid crystal (POLICRYPS) was realized. We study the optical performance of the POLICRYPS gratings by both numerical simulations and experiments. Characterization of the grating at normal and conical reading mount are performed....
journal article 2008
document
Sluijter, M. (author), De Boer, D.K.G. (author), Braat, J.J.M. (author)
Uniaxial optical anisotropy in the geometrical-optics approach is a classical problem, and most of the theory has been known for at least fifty years. Although the subject appears frequently in the literature, wave propagation through inhomogeneous anisotropic media is rarely addressed. The rapid advances in liquid-crystal lenses call for a good...
journal article 2008
document
Seravalli, E. (author), De Boer, M.R. (author), Geurink, F. (author), Huizenga, J. (author), Kreuger, R. (author), Schippers, J.M. (author), Van Eijk, C.W.E. (author)
journal article 2008
document
Seravalli, E. (author), De Boer, M. (author), Geurink, F. (author), Huizenga, J. (author), Kreuger, R. (author), Schippers, J.M. (author), Van Eijk, C.W.E. (author), Voss, B. (author)
journal article 2008
document
Xu, M. (author), Urbach, H.P. (author), De Boer, D.K.G. (author)
A color and polarization separating backlight can be obtained by using a surface-relief grating made of birefringent material as an outcoupling structure on top of the lightguide. A rigorous finite element diffraction model was applied to study the polarization effect of such a grating. The diffraction of plane waves by the anisotropic grating...
journal article 2007
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De Boer, D.K.G. (author), Urbach, H.P. (author), Xu, M. (author)
Poster presentation Optics Research Group TU Delft in cooperation with Philips and STW
journal article 2006
document
De Boer, R.W.I. (author)
Organic electronics constitute an innovative field, with interesting applications complementary to the silicon semiconductor technology. From a scientific perspective, there is large interest in the fundamental understanding of electrical transport in organic semiconductors. However, a well-developed microscopic description is still lacking, due...
doctoral thesis 2005
document
De Boer, R.W.I. (author), Stassen, A.F. (author), Craciun, M.F. (author), Mulder, C.L. (author), Molinari, A. (author), Rogge, S. (author), Morpurgo, A.F. (author)
We report the observation of ambipolar transport in field-effect transistors fabricated on single crystals of copper- and iron-phthalocyanine, using gold as a high work-function metal for the fabrication of source and drain electrodes. In these devices, the room-temperature mobility of holes reaches 0.3?cm2/V?s in both materials. The highest...
journal article 2005
document
Xu, M. (author), Urbach, H.P. (author), De Boer, D.K.G. (author), Cornelissen, H.J. (author)
The application of wire grid polarizers as efficient polarizing beam splitters for visible light is studied. The large differences between the transmissivity for different polarizations are explained qualitatively by using the theory of metallic wave guides. The results of rigorous calculations obtained by using the finite element method are...
journal article 2005
document
De Boer, R.W.I. (author), Iosad, N.N. (author), Stassen, A.F. (author), Klapwijk, T.M. (author), Morpurgo, A.F. (author)
We investigate the effect of a small leakage current through the gate insulator on the stability of organic single-crystal field-effect transistors (FETs). We find that, irrespective of the specific organic molecule and dielectric used, leakage current flowing through the gate insulator results in an irreversible degradation of the single...
journal article 2005
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