Abstract
Abstract Using 3·391 μm wavelength radiation to excite surface plasmons means that the conventional dimensional constraints imposed upon the dielectric thickness required for coupled surface plasmons is relaxed. Results are presented and analysed for coupled surface plasmons using silver layers spaced by a variable air gap of several micrometres thickness. Adjusting the air gap allows the determination of the dispersion curve for the coupled plasmons as a function of gap thickness down to a gap of about 5 μm.
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