Journal
ACS NANO
Volume 8, Issue 9, Pages 9286-9294Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn503195n
Keywords
quasicrystal; plasmonic nanoantenna; diffraction grating; surface plasmon polariton; Fourier plane; light management
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Funding
- Knut and Alice Wallenberg Foundation
- Swedish Research Council
- Swedish Foundation for Strategic Research
- Polish National Science Center
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Quasicrystals are structures that possess long-range order without being periodic. We investigate the unique characteristics of a photonic quasicrystal that consists of plasmonic Ag nanodisks arranged in a Penrose pattern. The quasicrystal scatters light in a complex but spectacular diffraction pattern that can be directly imaged in the back focal plane of an optical microscope, allowing us to assess the excitation efficiency of the various diffraction modes. Furthermore, surface plasmon polaritons can be launched almost isotropically through near-field grating coupling when the quasicrystal is positioned close to a homogeneous silver surface. We characterize the dispersion relation of the different excited plasmon modes by reflection measurements and simulations. It is demonstrated that the quasicrystal in-coupling efficiency is strongly enhanced compared to a nanopartide array with the same particle density but only short-range lateral order. We envision that the system can be useful for a number of advanced light harvesting and optoelectronic applications.
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