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
POLARIZATION CONTRAST IN FLUORESCENCE SCANNING NEAR-FIELD OPTICAL REFLECTION MICROSCOPY(full pdf)
JALOCHA A, VANHULST NF
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
vol 12 issue 9: p1577-p1580 SEP 1995
Polarization contrast is presented in fluorescence images of a Langmuir-Blodgett monolayer obtained with a scanning near-field optical microscope operated in reflection. A tapered optical fiber is used both to excite and to collect the fluorescence. The lateral resolution in the reflection fluorescence image is estimated at 200 nm. Shear-force detection controls the tip-to- surface distance and simultaneously gives a topographic map. Direct correlation between topography and the fluorescent domain is thus obtained. We show that the fluorescence is polarized along the molecular orientation in the Langmuir- Blodgett monolayer. Thus we demonstrate the study of the polarization direction in the reflection mode.