DEV Optical Theory Group

24 Sep 2025: Congratulations to Kaiyuan Wang, our PhD student, who had two of his papers accepted today. The first article introduces an approach to design high order EPs using transformation optics principles and was accepted in Laser & Photonics Reviews. The second article, co-authored with Niall Byrnes, was accepted in Optics Letters and discusses how our earlier work on Generalized Wigner Smith perturbation theory can be generalised to account for degenerate systems.

11 Aug 2025: We have a new preprint out on arXiv! Our paper, "Generalized Wigner-Smith theory for perturbations at exceptional and diabolic point degeneracies," introduces a new residue-based perturbation theory to understand and predict how non-Hermitian systems respond to external changes. We believe this offers a powerful framework for precision tuning and inverse design.

4 Aug 2025: As we start a new academic year OTG is joined by a new member, Duo. Although new to his PhD, Duo is not new to the group having previously worked with us as a Global Connect+ Fellow. He has however now graduated from Hanoi University of Science and Technology with his BSc in Electronic and Telecommunication Engineering and come back to Singapore, where his project will be looking at modelling and informatic optimisation of optical imaging and sensing devices.

25 Jul 2025: We are excited to share that our article proposing use of generalised Wigner-Smith operators to analyse resonance shifts in scattering systems has just been published in Newton, the latest physics journal from Cell Publishing. To top things off, we even made the cover!