Probing the chiral nature of electromagnetic fields surrounding plasmonic nanostructures
Barnes, William L.
Physical Review B: Condensed Matter and Materials Physics
American Physical Society
We investigate the chiral properties of near fields around plasmonic nanostructures and their relation to the electromagnetic chirality C. By combining chiral metal nanoparticles with achiral dye molecules and measuring the circular polarization dependence of the enhanced photoluminescence, we find a correlation between the dissymmetry of the luminescence enhancement and the calculated values of C. These effects are strong (∼10−1), despite the weak circular dichroism of the particles (∼10−5). We further show that C represents the chiral selectivity of the near-field coupling between an emitter and a nanoantenna.
Copyright © 2013 American Physical Society
Vol. 88 (4), article 041407(R)