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)

 

Multi-detection and polarisation contrast in scanning near- field optical microscopy in reflection

(full pdf)

Jalocha A, Moers MHP, Ruiter AGT, vanHulst NF
ULTRAMICROSCOPY
vol 61 issue 1-4: p221-p226 DEC 1995

We present a scanning near-field optical microscope operating in reflection suitable for simultaneous bright field and fluorescence imaging. A non-coated pulled optical fibre is used in true reflection mode, i.e. both as emitter and collector. Beam splitters, dichroic mirrors and polarisers are combined to discriminate the different wavelength and polarisation signals. The distance between fibre and sample is controlled by shear force feedback. Bright field and fluorescence images with polarisation contrast of dielectric samples have been obtained with 200 nm lateral resolution. We show the fluorescence polarisation dependence with the molecular orientation in application to Langmuir-Blodgett thin film domains.
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