Peak-type and dip-type metal-clad waveguide sensing.
Two types of operation for metal-clad waveguide sensors, peak-type and dip-type operation, are described. The newly discovered peak-type operation [Sens. Actuators B 94, 304 (2003)] can be achieved by use of a few-nanometers-thick cladding of a metal with a large imaginary permittivity, whereas conventional dip-type operation is obtained with a metal cladding with small imaginary permittivity some tens of nanometers thick. Both types of operation are described, and the main differences are illustrated.
Skivesen
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Optics and Plasma Research Department, Risø National Laboratory, DK-4000 Roskilde, Denmark. nina.skivesen@risoe.dk
Horvath
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Pedersen
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