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The effects of Fano resonance on the optical chirality of planar plasmonicnanodevices in the visible wavelength range are experimentally observed andtheoretically explained. The nanodevice consists of a nanodisk at the centerwith six gold nanorods with an orientation angle to exhibit optical chiralityunder dark-field illumination. The chiral response induced by the gold nanorodsare affected by the presence of the nanodisk with different diameters whichcauses Fano resonance. An intriguing change to the opposite selectionpreference of different handedness of the circularly polarized light has beenclearly observed experimentally. This change of the preference is understoodbased on the extended coupled oscillator model. Moreover, electrostaticanalysis and the time-dependent simulations provide a further understanding ofthe phenomenon. The observed and understood effects of Fano resonance onoptical chirality enables effective manipulation of chiral characteristics ofplanar subwavelength nanodevices.

Effects of Fano resonance on optical chirality of planar plasmonic nanodevices