Aperiodic nanoplasmonic devices for directional colour filtering and sensing

Matthew S. Davis (), Wenqi Zhu, Ting Xu (), Jay K. Lee, Henri J. Lezec and Amit Agrawal ()
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Matthew S. Davis: Center for Nanoscale Science and Technology, National Institute of Standards and Technology
Wenqi Zhu: Center for Nanoscale Science and Technology, National Institute of Standards and Technology
Ting Xu: Nanjing University
Jay K. Lee: Syracuse University
Henri J. Lezec: Center for Nanoscale Science and Technology, National Institute of Standards and Technology
Amit Agrawal: Center for Nanoscale Science and Technology, National Institute of Standards and Technology

Nature Communications, 2017, vol. 8, issue 1, 1-10

Abstract: Abstract Exploiting the wave-nature of light in its simplest form, periodic architectures have enabled a panoply of tunable optical devices with the ability to perform useful functions such as filtering, spectroscopy, and multiplexing. Here, we remove the constraint of structural periodicity to enhance, simultaneously, the performance and functionality of passive plasmonic devices operating at optical frequencies. By using a physically intuitive, first-order interference model of plasmon-light interactions, we demonstrate a simple and efficient route towards designing devices with flexible, multi-spectral optical response, fundamentally not achievable using periodic architectures. Leveraging this approach, we experimentally implement ultra-compact directional light-filters and colour-sorters exhibiting angle- or spectrally-tunable optical responses with high contrast, and low spectral or spatial crosstalk. Expanding the potential of aperiodic systems to implement tailored spectral and angular responses, these results hint at promising applications in solar-energy harvesting, optical signal multiplexing, and integrated sensing.

Date: 2017
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DOI: 10.1038/s41467-017-01268-y

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