title: Bright and dark plasmon resonances of nanoplasmonic antennas evanescently coupled with a silicon nitride waveguide.
abstract: In this work we investigate numerically and experimentally the resonance wavelength tuning of different nanoplasmonic antennas excited through the evanescent field of a single mode silicon nitride waveguide and study their interaction with this excitation field. Experimental interaction efficiencies up to 19% are reported and it is shown that the waveguide geometry can be tuned in order to optimize this interaction. Apart from the excitation of bright plasmon modes, an efficient coupling between the evanescent field and a dark plasmonic resonance is experimentally demonstrated and theoretically explained as a result of the propagation induced phase delay.
authors.forename: Frédéric
authors.initials: F
authors.lastname: Peyskens
authors.forename: Ananth Z
authors.initials: AZ
authors.lastname: Subramanian
authors.forename: Pieter
authors.initials: P
authors.lastname: Neutens
authors.forename: Ashim
authors.initials: A
authors.lastname: Dhakal
authors.forename: Pol
authors.initials: P
authors.lastname: Van Dorpe
authors.forename: Nicolas
authors.initials: N
authors.lastname: Le Thomas
authors.forename: Roel
authors.initials: R
authors.lastname: Baets