Journal
ADVANCED OPTICAL MATERIALS
Volume 8, Issue 5, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.201900942
Keywords
bonding and antibonding modes; dual band; optical antennas; phase change material; surface enhanced spectroscopy; surface plasmon polariton
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Funding
- Swedish Foundation for International Cooperation in Research and Higher Education, STINT Initiating Grant [IB2017-7026]
- Spanish Ministry of Science, Innovation and Universities [MAT2017-88358-C3-3-R]
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Resonant optical antennas supporting plasmon polaritons (SPPs)-collective excitations of electrons coupled to electromagnetic fields in a medium-are relevant to sensing, photovoltaics, and light-emitting devices, among others. Due to the SPP dispersion, a conventional antenna of fixed geometry, exhibiting a narrow SPP resonance, cannot simultaneously operate in two different spectral bands. In contrast, here it is demonstrated that in metallic disks, separated by a nanometric spacer, the hybridized antibonding SPP mode stays in the visible range, while the bonding one can be pushed down to the mid-infrared range. Such an SPP dimer can sense two materials of nanoscale volumes, whose fingerprint central frequencies differ by a factor of 5. Additionally, the mid-infrared SPP resonance can be tuned by employing a phase-change material (VO2) as a spacer. The dielectric constant of the phase-change material is controlled by heating the material at the frequency of the antibonding optical mode. These findings open the door to a new class of optoelectronic devices able to operate in significantly different frequency ranges in the linear regime, and with the same polarization of the illuminating wave.
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