Abstract
In this work, we demonstrate a kind of new standing wave modes of carrying space beat-frequency effect in an optimized nanopillar array, which can greatly reshape the electric filed distribution and result in high-quality biosensors. The in-depth theoretical research reveals that the mismatch of SPP wave vector and the light wave vector of high-order modes in medium is the crucial factors. The coupling distance, the SPP propagation distance, and the structure parameters also have been systematically investigated. Our results enrich the standing wave modes in nanostructures and give new insights into the fundamental understanding of the standing wave modes.
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