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Infrared Propagating Electromagnetic Surface Waves Excited by Induction

Published online by Cambridge University Press:  23 December 2019

Jonathan R. Brescia
Affiliation:
Physics, University of Central Florida, Orlando FL 32816 USAKBRwyle, Beavercreek, OH, 45431
Justin W. Cleary
Affiliation:
Air Force Research Laboratory, Sensors Directorate, RYDH, Wright-Patterson AFB OH 45433 USA
Evan M. Smith
Affiliation:
Air Force Research Laboratory, Sensors Directorate, RYDH, Wright-Patterson AFB OH 45433 USAKBRwyle, Beavercreek, OH, 45431
Robert E. Peale*
Affiliation:
Physics, University of Central Florida, Orlando FL 32816 USA
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Abstract

Propagating inhomogeneous electromagnetic waves called surface plasmon polaritons (SPPs) can be excited by free-space beams on corrugated conducting surfaces at resonance angles determined by corrugation period, permittivity, and optical frequency. SPPs are coupled to and co-propagate with surface charge displacements. Complete electrical isolation of individual conducting corrugations prevents the charge displacement necessary to sustain an SPP, such that excitation resonances of traveling SPPs are absent. However, SPPs can be excited via electric induction if a smooth conducting surface exists below and nearby the isolated conducting corrugations. The dependence of SPP excitation resonances on that separation is experimentally investigated here at long-wave infrared wavelengths. We find that excitation resonances for traveling SPPs broaden and disappear as the dielectric’s physical thickness is increased beyond ~1% of the free-space wavelength. The resonance line width increases with refractive index and optical thickness of the dielectric.

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Copyright
Copyright © Materials Research Society 2019

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