Compact Optical Antenna Coupler for Silicon Photonics Characterized by Third-Harmonic Generation

Themistoklis P.H. Sidiropoulos, Michael P. Nielsen, Tyler R. Roschuk, Anatoly V. Zayats, Stefan A. Maier, Rupert F. Oulton

Research output: Contribution to journalArticleResearchpeer-review

24 Citations (Scopus)


We exploit the strong interaction between a focused free-space beam and an optical antenna to construct a compact and efficient silicon waveguide coupler operating simultaneously in several telecommunications bands. The antenna is a directional coupler tuned by the spacing and relative size of its two constituent nanoparticles. Moreover, the antenna's compact size and short scattering lifetime provide a bandwidth sufficient to couple 200 fs pulses at both 1500 and 1350 nm simultaneously. By measuring the third-harmonic generation (THG) from waveguide-coupled light we verify our estimates of the high in-coupling efficiency of these antennas. Coupling efficiencies were estimated to be as high as 19% and 14% at the wavelengths of 1500 and 1350 nm, respectively. (Chemical Equation Presented).

Original languageEnglish
Pages (from-to)912-916
Number of pages5
JournalACS Photonics
Issue number10
Publication statusPublished - 15 Oct 2014
Externally publishedYes


  • nano-optics
  • nonlinear optics
  • plasmonics
  • silicon photonics
  • third-harmonic generation

Cite this