Abstract
Chirality is a geometrical property which indicates that the mirror image of a structure cannot be superimposed on itself. Chirality of three-dimensional structures, a very common phenomenon in nature, has received increased interest for the possible application in various nanophotonic technologies. Man-made chiral metamaterials have, for instance, demonstrated to significantly improve biosensing [1]. Transmission measurements on chiral structures are known to differentiate between the way in which right- and left-circularly polarized light interact with these structures, an effect called circular dichroism. This effect has recently been demonstrated on metal helices in the micrometer wavelength regime [2] and on chirally configured metal nanodiscs and metal nanohelices in the nanometer wavelength regime [3, 4]. For visible light applications, however, the fabrication process of complex three-dimensional chiral structures is challenging, where the corresponding structure sizes intrinsically have nanoscale dimensions. Recently, researchers demonstrated the successful downscaling of solid gold helices to the nanoscale using electron beam induced deposition [5]. Here, we use the same fabrication tool to fabricate periodic arrays of chiral core-shell nanohelices (fused silica-cold helices as shown in the inset of fig.1.a.). We investigate circular dichroism at these nanohelices, where the core-shell allows for additional tunability of the optical properties.
© 2015 IEEE
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