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.

 

EVANESCENT-FIELD OPTICAL MICROSCOPY - EFFECTS OF POLARIZATION, TIP SHAPE AND RADIATIVE WAVES

(full pdf)

VANHULST NF, SEGERINK FB, ACHTEN F, BOLGER B
ULTRAMICROSCOPY
vol 42: p416-p421 part A JUL 1992

Recent results in evanescent-field optical microscopy are presented. A resolution of 30 nm in the lateral directions and 0.1 nm in height has been obtained by suitable tip fabrication. Both the direction of the exciting field and the tip shape are shown to affect the optical coupling efficiency and resolution. Near-field diffraction patterns are observed with high lateral resolution by interference between evanescent and propagating waves.
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