Enhanced UV/blue fluorescent sensing using metal-dielectric-metal aperture nanoantenna arrays

Ngo, Quang Minh, Ho, Daniel, Pugh, Jon R., Sarua, Andrei and Cryan, Martin J. (2018) Enhanced UV/blue fluorescent sensing using metal-dielectric-metal aperture nanoantenna arrays. Current Applied Physics, 18 (7). pp. 793-798. ISSN 1567-1739

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Official URL: http://dx.doi.org/10.1016/j.cap.2018.04.007


Subwavelength aperture antenna arrays are designed and fabricated for potential applications in fluorescence sensing in the near UV/blue range. They are designed using finite-difference time-domain (FDTD) simulation, fabricated using focused ion beam etching and characterised using angular Fourier spectroscopy. The aperture arrays are formed in the top layer of an aluminum-silica-aluminum trilayer and produce a maximum simulated field intensity enhancement of 5.8 times at 406 nm and highly directive emission with a beamwidth of 8.3 deg. The normal incidence reflection response has been measured and shows reasonable agreement with modelled results. In addition, to investigate higher field intensity enhancements, bowtie aperture arrays are simulated and the influence of parameters such as dielectric gap, position of dipole source, and aperture shape and size are discussed and show enhancements up to 67 times are possible.

Item Type: Article
Uncontrolled Keywords: nanoantennas, aperture arrays, plasmonics
Subjects: H600 Electronic and Electrical Engineering
J500 Materials Technology not otherwise specified
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Paul Burns
Date Deposited: 12 Sep 2019 09:47
Last Modified: 10 Oct 2019 15:18
URI: http://nrl.northumbria.ac.uk/id/eprint/40651

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