Optical Sciences

Biomolecules and nanostructures

The Optical Sciences group studies the interaction of light and matter at the nanoscale. We do this by exploring ways to shape light and its environment. It's what we call active and passive control. Our current focus is on the interaction of light with biomolecules and nanostructures. We are part of Twente University's Department of Science and Technology and member of the MESA+ institute.
We participate in the EU-COST actions MP1102: Coherent Raman microscopy (MicroCor) and CM1202: Supramolecular photocatalytic water splitting (PERSPECT-H2O)


Measurement of a band-edge tail in the density of states of a photonic-crystal waveguide

(full pdf)

S.R. Huisman, G. Ctistis, S. Stobbe, A.P. Mosk, J.L. Herek, A. Lagendijk, P. Lodahl, W.L. Vos, and P.W.H. Pinkse
Physical Review B
vol. 86, issue 15, oct 26, 2012

We investigate light transport near the band edge of slow-light photonic-crystal waveguides using phasesensitive near-field microscopy. We obtain and interpret high-resolution band structures, allowing the retrieval of the optical density of states for a one-dimensional periodic system with weak intrinsic disorder. Because of this disorder, the band edge is smeared out and the van Hove singularity is removed. The density of states shows a decaying "tail" in the band gap corresponding to Anderson-localized modes, as predicted by Lifshitz for solid-state systems.
Printable version