We propose a type of photonic-plasmonic antennas capable of focusing light into subwavelength focal point(s) at several wavelengths, which are formed by embedding conventional dimer gap or bow-tie nanoantennas into multiple-periodic gratings. Fano-type coupling between localized surface plasmon resonances of dimer antennas and photonic modes in the gratings adds new functionalities, including multiple-wavelength operation and controllable enhancement of the field intensity in the focal point. Multiple-wavelength operation of nanoantennas provides tremendous opportunities for broadband single-molecule fluorescence and Raman sensing, emission enhancement, and near-field imaging.
© 2010 Optical Society of America
Original Manuscript: November 2, 2009
Revised Manuscript: December 21, 2009
Manuscript Accepted: January 7, 2010
Published: February 11, 2010
Svetlana V. Boriskina and Luca Dal Negro, "Multiple-wavelength plasmonic nanoantennas," Opt. Lett. 35, 538-540 (2010)