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)


Quantitative photon tunneling and shear-force microscopy of planar waveguide splitters and mixers

(full pdf)

Balistreri MLM, Korterik JP, Veldhuis GJ, Kuipers L, van Hulst NF
vol 89 issue 6: p3307-p3314 MAR 15 2001

A combined photon scanning tunneling and shear-force microscope has been developed to investigate the optical field distribution in a planar waveguide splitter and a multibranch mode mixer. The optical intensity distribution just above the surface of a planar waveguide is mapped with subwavelength resolution by a tapered optical fiber that probes the evanescent field. Simultaneously, the topography of the waveguide is recorded with subnanometer accuracy using a constant-distance feedback system based o­n shear-force detection with a tuning fork sensor. The experimental field patterns are quantitatively compared with field patterns simulated with the two-dimensional finite difference beam propagation method and a-mode solver. Good quantitative agreement between experiment and simulation is obtained. Moreover, the experiment reveals several details in the field distribution that results from incoupling conditions, mask imperfections, waveguide edges, and surface roughness. The surface effects in the optical field distribution are introduced by the use of the constant-distance feedback system. (C) 2001 American Institute of Physics.
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