Research Output per year

## Personal profile

### Research profile

Wilbert IJzerman is a Full Professor and Chair of Illumination Optics at Eindhoven University of Technology (TU/e). The TU/e Scientific Computing and Applications team (CASA), which he leads with dr.ir. Jan ten Thije Boonkkamp. They work on the mathematical-physical description and numerical simulation of illumination systems related to:

- The inverse optical problem. In the optical forward problem, the target distribution is calculated by ray tracing. In the inverse problem, the shape of the optical components is calculated directly given the source and target distribution. CASA aims to solve the inverse optical problem for more complex (industry-relevant) optical configurations that consist of more than one or two optical surfaces. In addition, CASA would like to find other solutions than current convex and concave solutions and to integrate the inverse approach with scattering surfaces.

- Improved optical simulation tools. A method based on Hamiltonian optics using the Liouville equation has significant speed advantages and will be developed further in the TTW Perspective Program ‘Free-Shape Scattering Optics’. CASA will extend the developed method to 3D and prove the applicability to practical problems.

The group’s work has resulted in a new versatile algorithm for mass transport problems that may be solved for arbitrary cost functions as well as improved ray tracing methods that are 1000x faster and 100x more accurate than current state-of-the-art methods.

### Academic background

After finishing his MSc in applied physics in 1995 and MSc in applied mathematics in 1996 Wilbert obtained his PhD in applied mathematics in 2000, all at the University of Twente.

He completed his executive MBA at Rotterdam School of Management in 2011

In addition to his activities at CASA, Prof. IJzerman guides some PhD students on characterization of optical components and the design of scattering materials at the department of Applied Physics at TU/e. He is also the head of the sector Lighting Technology at Signify Research. In this role he is responsible for the long-term technology roadmap and execution thereof for all lighting products. He is (co-)author of over 50 granted US patents. Wilbert is also a Member of the Industrial Advisory Committee of the European Optical Society.

## Fingerprint Fingerprint is based on mining the text of the person's scientific documents to create an index of weighted terms, which defines the key subjects of each individual researcher.

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## Research Output 1997 2019

## A least-squares method for a Monge-Ampère equation with non-quadratic cost function applied to optical design

Yadav, N. K., ten Thije Boonkkamp, J. H. M. & IJzerman, W. L., 1 Jan 2019,*Numerical Mathematics and Advanced Applications ENUMATH 2017.*Radu, F. A., Kumar, K., Berre, I., Nordbotten, J. M. & Pop, I. S. (eds.). Cham: Springer, p. 301-309 9 p. (Lecture Notes in Computational Science and Engineering; vol. 126)

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

## A Monge–Ampère problem with non-quadratic cost function to compute freeform lens surfaces

Yadav, N. K., ten Thije Boonkkamp, J. H. M. & IJzerman, W. L., 27 Mar 2019, In : Journal of Scientific Computing. 80, 1, p. 475-499 25 p.Research output: Contribution to journal › Article › Academic › peer-review

## Computation of double freeform optical surfaces using a Monge–Ampère solver: Application to beam shaping

Yadav, N. K., ten Thije Boonkkamp, J. H. M. & IJzerman, W. L., 15 May 2019, In : Optics Communications. 439, p. 251-259 9 p.Research output: Contribution to journal › Article › Academic › peer-review

## Decay of the electron density and the electron collision frequency between successive discharges of a pulsed plasma jet in N_{2}

van der Schans, M., Platier, B., Koelman, P., van de Wetering, F. M. J. H., van Dijk, J., Beckers, J., Nijdam, S. & IJzerman, W., 27 Mar 2019, In : Plasma Sources Science and Technology. 28, 3, 13 p., 035020Research output: Contribution to journal › Article › Academic › peer-review

## Solving inverse illumination problems with Liouville's equation

van Lith, B. S., ten Thije Boonkkamp, J. H. M. & IJzerman, W. L., 2019,*Numerical Mathematics and Advanced Applications ENUMATH 2017.*Radu, F. A., Kumar, K., Berre, I., Nordbotten, J. M. & Pop, I. S. (eds.). Cham: Springer, p. 311-319 9 p. (Lecture Notes in Computational Science and Engineering; vol. 126)

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

## Student theses

## Fast ray tracing in phase space for optical design

Author: Portegies, J., 31 Jan 2014Supervisor: ten Thije Boonkkamp, J. (Supervisor 1), IJzerman, W. (External coach) & Tukker, T. (External coach)

Student thesis: Master

## Inverse design of cylindrically symmetric reflector with scattering surfaces

Author: Jiang, S., 31 Aug 2017Supervisor: ten Thije Boonkkamp, J. (Supervisor 1) & IJzerman, W. (Supervisor 2)

Student thesis: Master

## Least-squares method for the Monge-Ampère equation with application to calculating lens surfaces in optical systems

Author: Bertens, M., 18 Dec 2017Supervisor: IJzerman, W. (Supervisor 1) & ten Thije Boonkkamp, J. (Supervisor 2)

Student thesis: Master

## Numerical models of light scattering in a dusty plasma

Author: Bertens, M., 2016Supervisor: IJzerman, W. (Supervisor 1), Beckers, J. (Supervisor 2) & Schepers, L. (Supervisor 2)

Student thesis: Bachelor

## Ray-optics analysis of switchable auto-stereoscopic lenticular-based 2D/3D displays

Author: Sluijter, M., 31 Dec 2005Supervisor: IJzerman, W. (Supervisor 1), de Boer, D. (Supervisor 2) & Kroesen, G. (Supervisor 2)

Student thesis: Master