Abstract
The optical properties of metal nanoparticles, enhanced by plasmonic resonances, hold great promise for nanoscale photonics applications such as optical-wavelength antennae and subwavelength lenses. Additional functionality can be obtained from the polarization properties of such structures. To this end, optically-active, chiral nanostructures that can rotate polarization are eagerly sought. Indeed, certain designs only tens of nm thick can exhibit extremely high specific rotations [1]. In addition, chiral symmetry breaking of L-shaped nanoparticles has been shown to lead to strong optical-activity effects in the linear and second-order optical responses [2]. In this paper, we show by polarization-sensitive second-harmonic generation (SHG) that T-shaped metal nanodimers with a nanogap exhibit strong optical activity. The effects are explained by chiral coupling between the horizontal and vertical arms of the dimers, which strongly depends on the gap size.
© 2007 IEEE
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