Abstract
Light scattering from chiral plasmonic structures can create near fields with an asymmetry greater than the equivalent circularly polarised light, a property sometimes referred to as superchirality.
Highlights
Using the tools of modern nanofabrication, periodic arrays of complex nanostructures of the same design can be routinely manufactured
In this study we have investigated how surface roughness influences the level of the chiral asymmetries of near fields created by the optical excitation of chiral plasmonic structures
In contrast the localised modes, I–III, which arise through the inductive coupling of the individual rod elements of the gammadion structure would be sensitive to morphological heterogeneity of the real structures
Summary
Using the tools of modern nanofabrication, periodic arrays of complex nanostructures of the same design can be routinely manufactured. Near fields generated by light scattering from nanostructures can, in localised regions of space, possess a greater level of chiral asymmetry than comparable circularly polarised light (CPL), a property sometimes referred to as superchirality Such fields with enhanced chiral asymmetry can be exploited for ultrasensitive detection of chiral (bio)molecules.[4,5,6,7] Numerical simulations used in previous studies to understand the chiral asymmetries of these field have relied on idealised models of the chiral structure.[6,7,8] In this study we have attempted to understand the influence of surface roughness by using a ‘‘real’’ model for the chiral nanostructure, a gammadion, directly derived from atomic force microscopy images, in periodic numerical simulations. This suggests that surface roughness plays a role in determining the effectiveness of a chiral plasmonic structure for bio-detection applications
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