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)


Shear force imaging of soft samples in liquid using a diving bell concept

(full pdf)

M. Koopman, B. I. de Bakker, M. F. Garcia-Parajo, and N. F. van Hulst
Applied Physics Letters
Vol 83, Issue 24, pp. 5083-5085, Dec 15, 2003

We present a reliable and easy-to-use system, with a perfect analogy to a diving bell, to perform tuning fork based shear force microscopy o­n soft cells in liquid. Using the diving bell concept the tuning fork vibrates in air, while the tip is immersed in solution. In this way Q factors of 200 and higher in liquid are routinely obtained. The force feedback is reliable and stable over hours requiring a minimum adjustment of the set-point during imaging. With this system, tip-sample interaction forces are kept below 350 pN, enabling us to image soft dendritic cells in a buffer solution. ©2003 American Institute of Physics.
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