Journal article
Optical Chirality from Dark-Field Illumination of Planar Plasmonic Nanostructures
Y Hwang, B Hopkins, D Wang, A Mitchell, TJ Davis, J Lin, XC Yuan
Laser and Photonics Reviews | WILEY-V C H VERLAG GMBH | Published : 2017
Abstract
Dark-field illumination is shown to make planar chiral nanoparticle arrangements exhibit circular dichroism in extinction, analogous to true chiral scatterers. Single oligomers, consisting rotationally symmetric arrangements of gold nanorods, are experimentally observed to exhibit circular dichrosim at their maximum scattering with strong agreement to numerical simulation. A dipole model is developed to show that this effect is caused by a difference in the projection of a nanorod onto the handed orientation of electric fields created by a circularly polarized dark-field normally incident on a glass-air interface. Owing to this geometric origin, the wavelength of the peak chiral response is ..
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Awarded by Natural Science Foundation of Guangdong Province
Funding Acknowledgements
The work is supported by the leading talents of Guangdong province program No. 00201505 and the Natural Science Foundation of Guangdong Province under No. 2016A030312010. This work was performed in part at the Melbourne Centre for Nanofabrication (MCN) in the Victorian Node of the Australian National Fabrication Facility (ANFF). BH acknowledges the discussions on theory and simulation with A.E. Miroshnichenko, Z. Fan, S. Trendafilov and M.R. Shcherbakov, the advice of F. Demming and C. Kremers (CST) on simulations using CST Microwave Studio, and the support from A.E. Miroshnichenko, Y.S. Kivshar and G. Shvets.