Polarisation-selective hotspots in metallic ring stack arrays
Brooks, Laura J
Optical Society of America
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Brooks, L. J., Mertens, J., Bowman, R. W., Chikkaraddy, R., Sanders, A., & Baumberg, J. J. (2016). Polarisation-selective hotspots in metallic ring stack arrays. Optics Express, 24 3663-3671. https://doi.org/10.1364/OE.24.003663
We demonstrate a simple, scalable fabrication method for producing large-area arrays of vertically stacked metallic micro-rings, embedded in a deformable polymer sheet. Unusual polarisation-dependent hotspots are found to dominate the reflection images. To understand their origin, the arrays are characterized using point-scanning optical spectroscopy and directly compared to numerical simulations. Individual ring stacks act as microlenses, while polarisation-dependent hotspots arise at the connections between neighbouring stacks, which are comprised of parabolically-arranged parallel gold nanowires. The elastomeric properties of the polymer host opens the door to active control of the optics of this photonic material, through dynamic tuning of the nanowire spacings and array geometry.
Diffraction Gratings, Three-dimensional Fabrication, Multispectral and hyperspectral imaging, Photolithography, Polarization-selective devices, Microstructure Fabrication, Nanophotonics and photonic crystals
We are grateful for funding from the Cambridge NanoDTC, ERC LINASS 320503, and UK EPSRC grants EP/L027151/1 and EP/L015978/1. JM acknowledges support from the Winton Programme for the Physics of Sustainability, RWB thanks Queen’s College Cambridge for financial support, and RC acknowledges support from the Dr. Manmohan Singh scholarship from St. John’s College.
External DOI: https://doi.org/10.1364/OE.24.003663
This record's URL: https://www.repository.cam.ac.uk/handle/1810/253411
Attribution 2.0 UK: England & Wales
Licence URL: http://creativecommons.org/licenses/by/2.0/uk/