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)


Extraction of optical Bloch modes in a photonic-crystal waveguide

(full pdf)

S. R. Huisman, G. Ctistis, S. Stobbe, J. L. Herek, P. Lodahl, W. L. Vos, and P. W. H. Pinkse
Journal of Applied Physics
vol 111 p033108 february 13, 2012

We perform phase-sensitive near-field scanning optical microscopy on photonic-crystal waveguides.
The observed intricate field patterns are analyzed by spatial Fourier transformations, revealing several guided transverse electric (TE) and transverse magnetic (TM) like modes. Using the reconstruction algorithm proposed by Ha et al. [Opt. Lett. 34, 3776 (2009)], we decompose the measured twodimensional field pattern in a superposition of propagating Bloch modes. This opens new possibilities to study specific modes in near-field measurements. We apply the method to study the transverse behavior of a guided TE-like mode, where the mode extends deeper in the surrounding photonic crystal when the band edge is approached. @copy; 2012 American Institute of Physics.
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