Design of Aluminum Bowtie Nanoantenna Array with Geometrical Control to Tune LSPR from UV to Near-IR for Optical Sensing
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Design of Aluminum Bowtie Nanoantenna Array with Geometrical Control to Tune LSPR from UV to Near-IR for Optical Sensing Bin Wang 1,2 & Subhash C. Singh 1,3 & Huanyu Lu 1,2 & Chunlei Guo 1,3 Received: 14 July 2019 / Accepted: 3 November 2019 # Springer Science+Business Media, LLC, part of Springer Nature 2019
Abstract Plasmonic nanoantennas have earned strong recognition for their unique capability to confine light from free space into subwavelength dimensions with strong electric field (E-field) enhancement factor due to localized surface plasmon resonance (LSPR). Broad spectral tuning of LSPR from ultraviolet (UV) to near-infrared (NIR) is required for incident light wavelength and material sensitive plasmonic applications in different spectral regions. In this article, we introduced and designed a novel aluminum plasmonic platform consisting of a bowtie nanoantenna (BNA) array with metal-insulator-metal (MIM) configuration where LSPR peak position was broadband tunable from UV to NIR through geometric control of antenna parameters. Furthermore, we designed and numerically analyzed a plasmonic biosensor platform that detected concentration of glycerol in de-ionized (DI) water with a concentration in the range of 0 to 40 wt% (refractive index = 1.333 to 1.368) with a sensitivity of 497 nm/RIU (refractive index units). The designed plasmonic platform can also be used as a surface-enhanced Raman scatting (SERS) substrate with enhancement factor as high as 4.82 × 109 for 1042 nm excitation wavelength. The reported hybrid dielectric-metallic plasmonic nanostructured system is a universal plasmonic platform for a wide range of applications including single-molecule SERS, biosensing, fluorescence microscopy, plasmonic nanocavity, nanolasers, and solid-state lighting. Keywords Aluminum plasmonics . Bowtie nanoantenna . Localized surface plasmon resonance . Tunability . SERS . Plasmonic sensor
Introduction Recently, plasmonic nanoantennas received enough attention owing their unique capability to confine light from free space into sub-wavelength dimensions with strong electric field (Efield) enhancement due to localized surface plasmon resonance (LSPR) [1–11]. Various designs of plasmonic nanoantennas such as Yagi-Uda antennas, spiral Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11468-019-01071-z) contains supplementary material, which is available to authorized users. * Subhash C. Singh [email protected] * Chunlei Guo [email protected] 1
Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
3
The Institute of Optics, University of Rochester, Rochester, NY 14627, USA
nanoantennas, honey-comb antennas, nanodiscs, nanorods, and bowtie antennas with LSPR wavelengths ranging from ultraviolet (UV) to near-infrared (NIR) spectral regions are used for a number of optical and sensing applications, including but not limited to surface-e
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