Detuned Electrical Dipoles for Plasmonic Sensing

Andrey B. Evlyukhin, Sergey I. Bozhevolnyi, Anders Pors, Michael G. Nielsen, Ilya P. Radko, Morten Willatzen, Ole Albrektsen

Research output: Contribution to journalJournal articleResearchpeer-review


We demonstrate that a pair of electrical dipolar scatterers resonating at different frequencies, i.e., detuned electrical dipoles, can be advantageously employed for plasmonic sensing of the environment, both as an individual subwavelength-sized sensor and as a unit cell of a periodic array. It is shown that the usage of the ratio between the powers of light scattered into opposite directions (or into different diffraction orders), which peaks at the intermediate frequency, allows one to reach a sensitivity of ≈400 nm/RIU with record high levels of figure of merit exceeding 200. Qualitative considerations are supported with detailed simulations and proof-of-principle experiments using lithographically fabricated gold nanorods with resonances at ∼800 nm.
Original languageEnglish
JournalNano Letters
Issue number11
Pages (from-to)4571-4577
Publication statusPublished - 2010
Externally publishedYes


  • Plasmonics
  • localized surface plasmons
  • plasmonic sensing


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