Optical Sciences

Biomolecules and nanostructures

The Optical Sciences group studies the interaction of light and matter. Our current focus is on detection and sensing/imaging with an emphasis on the development of integrated photonics. We are part of Twente University's Department of Science and Technology and member of the MESA+ institute.

 

Reflection type near field optical and atomic force microscope




(A. Jalocha)
For imaging of highly reflecting or opaque sample we have designed and realised a reflection type near-field optical set-up. The fibre probe is illuminated using an Ar-laser, while the reflected light (bright field and fluorescence) is separated using (dichroic) beamsplitters and polarisation optics. Langmuir-Blodgett monolayers and mixtures of fluorescent latex spheres have been imaged in reflection, simultaneously with shear force, absorption and polarised fluorescence contrast. Interestingly we found chemically specific adhesion contrast in the shear force signal.
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