International Workshop on
Optical Wave & Waveguide Theory and Numerical Modelling
OWTNM Workshop Series
OWTNM 2025 — XXXI International Workshop on Optical Wave & Waveguide Theory and Numerical Modelling

Nottingham, UK, April 08–10, 2025
The yearly OWTNM workshop has, since 1992, provided a forum for lively debates, intended to bring forward new ideas in the field of theoretical and computational photonics. Basic physics and novel applications, artificially structured materials and new devices, elegant mathematical techniques and efficient numerical methods to tackle the Maxwell equations form the constantly evolving subjects. These are discussed in a traditionally open and relaxed atmosphere.
Workshop topics
Topics of interest for the OWTNM workshop address the physical understanding, the mathematical description, and the computational treatment of guided as well as non-guided optical waves and related effects in micro- and nanostructures. They include, but are not limited to:
OWTNM workshop format

Over the years, a couple of formal aspects have crystallized as being typical for the OWTNM "format":

Necessarily, the specifics of each new event will depend largely on the preferences and choices of the local organizers, on constraints imposed by the yearly changing location, on a collocated conference, or on other internal or external influences.

Workshop history

The first International Workshop on Optical Waveguide Theory and Numerical Modelling was held in Teupitz, Germany, in 1992. Since then, the annual conference has moved across Europe, with one detour to Australia:

Photo kindly contributed by Hans-Peter Nolting.
OWTNM proceedings
Collections of the one-page papers, or extended abstracts, respectively, as accepted for presentation at the OWTNM workshops, published electronically and/or as a printed booklet, in many cases including the detailed technical program of the events. Links OQE or JLT refer to special issues or topical collections of full papers associated with the respective workshops in Optical and Quantum Electronics, and to an article in the Journal of Lightwave Technology on a solver benchmark initiated at the very first workshop in the series.
OWTNM technical committee

Previous members

For questions on the OWTNM workshop series, or for suggestions concerning this web site, please send your e-mail to Alternatively, you might wish to contact the members of the technical committee directly. Please send any inquiries about the upcoming workshop (e.g. about dates, venue, paper submission, registration, etc.) to the respective local organizers.



The content on the pages at has been prepared with care, in the hope that it will be useful. Please note that all information is provided 'as is' without warranty of any kind, without even the implied warranty of merchantability or fitness for a particular purpose. Responsibility for the contents of all linked external pages rests fully with the owners of the respective sites.

Privacy notice

These are private, noncommercial pages. When you access the site, certain information send by your internet browser will be stored in the server log files. This concerns e.g. the version and type of your browser, the pages that you access, information on the referring page, date and time of the access, and your IP address. In case you contact the site owner by e-mail, your e-mail address will be stored, e.g. for purposes of further correspondence.


… on behalf of the OWTNM technical committee:

Manfred Hammer
University of Paderborn, Warburger Strasse 100, 33098 Paderborn, Germany
Phone: ++49 (0)5251/60-3560, Fax: ++49 (0)5251/60-3524