document

Compact collimators for high brightness blue LEDs using dielectric multilayers

Cornelissen, H.J. (author), Ma, H. (author), Ho, C. (author), Li, M. (author), Mu, C. (author)

A novel method is presented to inject the light of millimeter-sized high-brightness blue LEDs into light guides of submillimeter thickness. Use is made of an interference filter that is designed to pass only those modes that will propagate in the light guide by total internal reflection. Other modes are reflected back to the LED cavity and...

conference paper 2011

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Ray-optics analysis of inhomogeneous optically anisotropic media

Sluijter, M. (author)

When the optical behavior of light in a medium depends on the direction in which light is traveling, the medium is called optically anisotropic. Light is an electromagnetic wave and in this thesis, we discuss the electromagnetic theory on optical anisotropy. We do this with the assumption that the wavelength of light approaches zero. The field...

doctoral thesis 2010

document

On maximum field components in the focal point of a lens

Urbach, H.P. (author), Pereira, S.F. (author), Broer, D.J. (author)

We determine field distributions in the pupil of a high NA lens, that give, for a given power incident on the lens, the maximum electric field amplitude in focus in a specific direction. We consider in particular the cases of maximum longitudinal and maximum transverse components. The distribution of the maximum longitudinal component in the...

conference paper 2009

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Finding order in the design landscape of simple optical systems

Van Grol, P. (author), Bociort, F. (author), Van Turnhout, M. (author)

Contrary to the frequent tacit assumption that the local minima of a merit function are points scattered more or less randomly over the design landscape, we have found that, at least for simple imaging systems (doublets with three and triplets with five variables) all design shapes we have observed thus far form a strictly ordered set of points,...

conference paper 2009

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Finding new local minima in lens design landscapes by constructing saddle points

Bociort, F. (author), Van Turnhout, M. (author)

journal article 2009

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Ray-tracing simulations and applications of liquid crystal beam control devices

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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Saddle-point construction in the design of lithographic objectives, part 2: Application

Marinescu, O. (author), Bociort, F. (author)

journal article 2008

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Saddle-point construction in the design of lithographic objectives, part 1: Method

Marinescu, O. (author), Bociort, F. (author)

journal article 2008

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Compensation and optimization of dispersion in nulling interferometry

Spronck, J.F.P. (author), Los, J.W.N. (author), Pereira, S.F. (author)

The optical properties of materials are wavelength-dependent. This property, called dispersion, affects the performance of a wide-band nulling interferometer by inducing wavelength-dependent phase differences between the arms of the interferometer. In this paper, we analyze the influence of dispersion in nulling interferometers for exoplanet...

conference paper 2008

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Correlation functions formed by a femtosecond pulse interferometer

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

document

Theoretical study of long distance measurement using frequency comb laser

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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Optimization of extreme ultraviolet mirror systems comprising high-order aspheric surfaces

Marinescu, O. (author), Bociort, F. (author)

journal article 2008

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Design of a polarization nulling interferometer for exoplanet detection

Spronck, J. (author), Vosteen, L.L.A. (author), Pereira, S.F. (author), Braat, J.J.M. (author)

We present the design of a new testbed experiment to demonstrate nulling interferometry using polarization properties. This three-beam set-up is perfectly symmetric with respect to the number of reflections and transmissions and should therefore allow a high rejection ratio in a wide spectral band.

conference paper 2007

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Vectorial analysis of polarization issues in multi-axial nulling interferometers for exoplanet detection

Spronck, J. (author), Pereira, S.F. (author), Braat, J.J.M. (author)

We show the theoretical limitations of a multi-axial nulling interferometer with respect to longitudinal polarization. We furthermore analyze the filtering capabilities of a single-mode fiber in this case.

conference paper 2007

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Practical guide to saddle-point construction in lens design

Bociort, F. (author), Van Turnhout, M. (author), Marinescu, O. (author)

Saddle-point construction (SPC) is a new method to insert lenses into an existing design. With SPC, by inserting and extracting lenses new system shapes can be obtained very rapidly, and we believe that, if added to the optical designer’s arsenal, this new tool can significantly increase design productivity in certain situations. Despite the...

conference paper 2007

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Predictability and unpredictability in optical system optimization

Van Turnhout, M. (author), Bociort, F. (author)

Local optimization algorithms, when they are optimized only for speed, have in certain situations an unpredictable behavior: starting points very close to each other lead after optimization to different minima. In these cases, the sets of points, which, when chosen as starting points for local optimization, lead to the same minimum (the so...

conference paper 2007

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Designing lithographic objectives by constructing saddle points

Marinescu, O. (author), Bociort, F. (author)

Optical designers often insert or split lenses in existing designs. Here, we present, with examples from Deep and Extreme UV lithography, an alternative method that consists of constructing saddle points and obtaining new local minima from them. The method is remarkable simple and can therefore be easily integrated with the traditional design...

conference paper 2006

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Development of a liquid based deformable mirror

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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Looking for order in the optical design landscape

Bociort, F. (author), Van Turnhout, M. (author)

Poster presentation Optics Research Group TU Delft in cooperation with STW The presence of multiple local minima in the merit function landscape is one of the main difficulties in optical system design, especially for systems with many variables. By considering saddle points, we find a certain degree of order in the design landscape that...

journal article 2006

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Estimating resist parameters in optical lithography using the extended Nijboer-Zernike theory

Dirksen, P. (author), Braat, J. (author), Janssen, A.J.E.M. (author)

journal article 2006