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Hybrid Nanodisk Film for Ultra-Narrowband Filtering, Near-Perfect Absorption and Wide Range Sensing

1
College of Physics and Optoelectronics Engineering, Dalian University of Technology, Dalian 116024, China
2
College of Science, North University of China, Taiyuan 030051, China
3
College of mechatronic Engineering, North University of China, Taiyuan 030051, China
4
Department of Chemistry, University of Montréal, Montréal, Quebec H3C 3J7, Canada
*
Author to whom correspondence should be addressed.
Nanomaterials 2019, 9(3), 334; https://doi.org/10.3390/nano9030334
Received: 29 December 2018 / Revised: 7 February 2019 / Accepted: 20 February 2019 / Published: 2 March 2019
The miniaturization and integration of photonic devices are new requirements in the novel optics field due to the development of photonic information technology. In this paper, we report that a multifunctional layered structure of Au, SiO2 and hexagonal nanodisk film is advantageous for ultra-narrowband filtering, near-perfect absorption and sensing in a wide refractive index (RI) region. This hexagonal nanostructure presented two remarkable polarization independent plasmon resonances with near-zero reflectivity and near-perfect absorptivity under normal incidence in the visible and near-infrared spectral ranges. The narrowest full width at half maximum (FWHM) of these resonances was predicted to be excellent at 5 nm. More notably, the double plasmon resonances showed extremely obvious differences in RI responses. For the first plasmon resonance, an evident linear redshift was observed in a wide RI range from 1.00 to 1.40, and a high RI sensitivity of 600 nm/RIU was obtained compared to other plasmonic nanostructures, such as square and honeycomb-like nanostructures. For the second plasmon resonance with excellent FWHM at 946 nm, its wavelength position almost remained unmovable in the case of changing RI surrounding nanodisks in the same regime. Most unusually, its resonant wavelength was insensitive to nearly all structural parameters except the structural period. The underlying physical mechanism was analyzed in detail for double plasmon resonances. This work was significant in developing high-performance integrated optical devices for filtering, absorbing and biomedical sensing. View Full-Text
Keywords: multifunctional; hexagonal nanodisk film; ultra-narrowband filtering; near-perfect absorption; wide RI sensing multifunctional; hexagonal nanodisk film; ultra-narrowband filtering; near-perfect absorption; wide RI sensing
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Cui, W.; Peng, W.; Yu, L.; Luo, X.; Gao, H.; Chu, S.; Masson, J.-F. Hybrid Nanodisk Film for Ultra-Narrowband Filtering, Near-Perfect Absorption and Wide Range Sensing. Nanomaterials 2019, 9, 334.

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