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.

 

Visualization of mode transformation in a planar waveguide splitter by near-field optical phase imaging

(full pdf)

Balistreri MLM, Korterik JP, Kuipers L, van Hulst NF
APPLIED PHYSICS LETTERS
vol 79 issue 7: p910-p912 AUG 13 2001

The gradual transformation of a guided TM00 mode into an "intermediate" double mode by a splitting junction has been investigated with a phase-sensitive photon scanning tunneling microscope. Field profiles and wave vectors of the modes have been directly determined from the phase information. Via a Fourier analysis of the measured phase and amplitude maps the decay of the TM00 mode and buildup of the intermediate mode have been directly visualized. Phase singularities and phase jumps in the transition region underline the mode transformation process. Finally, a partial polarization conversion of the TM modes to TE-polarized modes has been observed. (C) 2001 American Institute of Physics.
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