Optical biosensing with strongly coupled modes of a plasmonic-photonic trimer

What is it about?

We devised a lithography-free plasmonic-photonic hybrid nanostructure to exhibit cavity-mediated Normal-mode splitting phenomena among doubly degenerate Tamm Plasmon Polariton modes. The designed nanostructure manifests three strongly coupled modes, and their exotic dispersion was used to offer a self-reference spectroscopic refractive index sensor at optical frequencies. The distinctive advantages like self-reference, high sensitivity, and the freedom to realize a trade-off between ultrahigh sensitivity and dynamic range of operation make our structure widely relevant in developing field-deployable biosensing platforms.

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