Electro-optic modulation in bulk silicon using surface plasmon resonance

Kapil Debnath, Pedro Damas, Liam O'Faolain*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)
1 Downloads (Pure)


We propose and present simulated results for a new design of an optical modulator based on Surface Plasmon Polariton (SPP) resonance. The modulator is realized on a bulk silicon substrate, thus offering an opportunity for front-end integration with electronic circuits. The device consists of a dielectric waveguide evanescently coupled to a SPP mode at the interface between bulk silicon and metal. By using SPP resonance we achieved an ultra-high spectral sensitivity (∼5000 nm/refractive index unit) with large modulation bandwidth (90 nm). For a refractive index change of 0.02, we achieved 100 nm shift in resonance wavelength and a modulation depth of ∼10 dB.

Original languageEnglish
Pages (from-to)31-35
Number of pages5
JournalPhotonics and Nanostructures : Fundamentals and Applications
Early online date10 Dec 2015
Publication statusPublished - 1 Jan 2016


  • Surface plasmons
  • Integrated optoelectronic circuits
  • Modulators
  • Silicon photonics


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