Ultra-sharp plasmonic resonances from monopole optical nanoantenna phased arrays

Shi Qiang Li, Wei Zhou, D. Bruce Buchholz, John B. Ketterson, Leonidas E. Ocola, Kazuaki Sakoda, Robert P.H. Chang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

32 Scopus citations


Diffractively coupled plasmonic resonances possess both ultra-sharp linewidths and giant electric field enhancement around plasmonic nanostructures. They can be applied to create a new generation of sensors, detectors, and nano-optical devices. However, all current designs require stringent index-matching at the resonance condition that limits their applicability. Here, we propose and demonstrate that it is possible to relieve the index-matching requirement and to induce ultra-sharp plasmon resonances in an ordered vertically aligned optical nano-antenna phased array by transforming a dipole resonance to a monopole resonance with a mirror plane. Due to the mirror image effect, the monopole resonance not only retained the dipole features but also enhanced them. The engineered resonances strongly suppressed the radiative decay channel, resulting in a four-order of magnitude enhancement in local electric field and a Q-factor greater than 200.

Original languageEnglish (US)
Article number231101
JournalApplied Physics Letters
Issue number23
StatePublished - Jun 9 2014

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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