Searched for: subject%3A%22Birefringence%22
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Lut, Jasper-Jan (author)
Drones that perform complex autonomous movements require a perfect estimate of their current position. However, internal measurement unit (IMU) errors introduce drift in this estimate, leading to significant discrepancies between the predicted and actual location. Various solutions have been proposed to calibrate the IMU, including methods...
master thesis 2023
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Owen, C.C. (author), Hendrikse, H. (author)
The manual application of universal (Rigsby) stage techniques is commonly used to determine the fabric of thin sections of ice viewed with crossed-polarized light. This process can require hours of focus in cold conditions to identify the c-axis of each grain in a thin section. Automated ice texture and fabric methods of several forms exist...
journal article 2023
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Soman, Rohan (author), Fazzi, L. (author), Nokhbatolfoghahai, A. (author), Groves, R.M. (author), Ostachowicz, Wieslaw (author)
To perform active structural health monitoring (SHM), guided waves (GW) have received great interest as they can inspect large areas with a few sensors and are sensitive to barely-visible structural damages. Fiber Bragg grating (FBG) sensors offer several advantages such as small size, low weight and ability to be embedded but their use has...
conference paper 2022
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Fazzi, L. (author), Rajabzadeh, Aydin (author), Milazzo, Alberto (author), Groves, R.M. (author)
Loads applied transversely on the external surface of waveguides change their circular cross-sectional geometry generating birefringence. Due to this effect the reflected spectrum of a Fibre Bragg grating (FBG) undergoes a splitting of the single peak of the Bragg wavelength. In this work, we employed the Transfer Matrix Method (TMM) for x-...
conference paper 2019
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Spiesz, E.M. (author), Thorpe, Chavaunne T. (author), Thurner, Philipp J. (author), Screen, Hazel R.C. (author)
Structure-function relationships in tendons are directly influenced by the arrangement of collagen fibres. However, the details of such arrangements in functionally distinct tendons remain obscure. This study demonstrates the use of quantitative polarised light microscopy (qPLM) to identify structural differences in two major tendon...
journal article 2018
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Kislaya, A. (author), Sciacchitano, A. (author)
The use of optical diffusers for the reduction of peak-locking errors in particle image velocimetry is investigated. The working principle of the optical diffusers is based on the concept of birefringence, where the incoming rays are subject to different deflections depending on the light direction and polarization. The performances of the...
journal article 2018
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Huang, Z. (author)
Heterogeneity is a general feature in biological system. In order to avoid possible misleading effects of ensemble averaging, and to ensure a correct understanding of the biological system, it is very important to look into individuals, such as a single bio-molecule or a single cell, for details. The size of a single bio-molecule/cell typically...
doctoral thesis 2012
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Diedenhofen, S.L. (author), Algra, R.E. (author), Bakkers, E.P.A.M. (author), Gómez Rivas, J. (author)
The propagation of light in layers of vertically aligned nanowires is determined by their unique and extreme optical properties. Depending on the nanowire filling fraction and their diameter, layers of nanowires form strongly birefringent media. This large birefringence gives rise to sharp angle dependent peaks in polarized reflection. We...
journal article 2011
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Chimento, P.F. (author), Kuzmin, N.V. (author), Bosman, J. (author), Alkemade, P.F.A. (author), 'T Hooft, G.W. (author), Eliel, E.R. (author)
We have experimentally studied the polarization-dependent transmission properties of a nanoslit in a gold film as a function of its width. The slit exhibits strong birefringence and dichroism. We find, surprisingly, that the transmission of the polarization parallel to the slit only disappears when the slit is much narrower than half a...
journal article 2011
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Mu, C. (author), Cornelissen, H.J. (author), Bociort, F. (author), Liebig, T. (author)
A new approach is described to couple light from high-power blue LEDs (1x1mm2) into a thin large area light guide using a dielectric interference multilayer as an angular filter. The goal is to achieve large area luminaires such as backlight systems. The method overcomes the drawback of structuring holes or recessions in light guides when using...
conference paper 2011
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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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Dündar, M.A. (author), Kicken, H.H.J.E. (author), Silov, A.Y. (author), Nötzel, R. (author), Karouta, F. (author), Salemink, H.W.M. (author), Van der Heijden, R.W. (author)
Mode-dependent shifts of resonant frequencies of cavities in liquid crystal (LC) infiltrated planar photonic crystals (PhC) are experimentally observed when the temperature is varied across the LC ordering transition. The shifts can be in opposite directions, even for two very similar nearly degenerate modes. The behavior is attributed to the...
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
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Xu, M. (author)
Diffraction gratings are being used to manipulate light in many different applications, such as in flat panel display systems, modern lighting systems, and optical recording. Diffraction gratings can be made polarization selective due to form birefringence. An alternative approach to polarization selective gratings is to use birefringent...
doctoral thesis 2009
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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
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Sluijter, M. (author), De Boer, D.K.G. (author), Urbach, H.P. (author), Strömer, J. (author), Cennini, G. (author)
conference paper 2009
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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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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
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Serebriakov, A. (author), Bociort, F. (author), Braat, J. (author)
In the year 2001 it was reported that the birefringence induced by spatial dispersion (BISD), sometimes also called intrinsic birefringence, had been measured and calculated for fluorides CaF2 and BaF2 in the deep UV range. It was also shown that the magnitude of the BISD in these cubic crystals is sufficiently large to cause serious problems...
conference paper 2005
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Sevenhuijsen, P.J. (author)
The measurement of deformations remains an important discipline for the development and evaluation of structures. The report gives a survey of the most important measurement methods now available. Aspects of light which are vital for the understanding of optical methods are treated because these methods become more and more important. The...
report 1982
Searched for: subject%3A%22Birefringence%22
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