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.

 

NEAR-FIELD OPTICAL MICROSCOPY IN TRANSMISSION AND REFLECTION MODES IN COMBINATION WITH FORCE MICROSCOPY


VANHULST NF, MOERS MHP, BOLGER B
JOURNAL OF MICROSCOPY-OXFORD
vol 171: p95-p105 part 2 AUG 1993

Near-field optical microscopy is the optical alternative of the various types of scanning probe microscopes. The technique overcomes the classical diffraction limit in conventional optical microscopy. In this paper the concepts of near-field optics (NFO) are introduced, followed by a short review of current trends in NFO microscopy. Specifically, developments concerning the efficiency and versatility of both aperture and dielectric probe types are discussed. We present our advances in NFO microscopy, using both fibres and integrated silicon nitride (SiN) structures as dielectric probes. The use of an SIN probe as a combined optical and force sensor is shown to be advantageous, as it provides a feedback mechanism and allows direct comparison between topography and electric effects. Images of technical and biological samples are presented with a lateral resolution down to 20 nm, depending o­n the microscopical arrangement used.
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