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 B94, 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.
© 2005 Optical Society of America
N. Skivesen, R. Horvath, and H. C. Pedersen, "Peak-type and dip-type metal-clad waveguide sensing," Opt. Lett. 30, 1659-1661 (2005)