Self-Referencing Plasmonic Array Sensors

Autor:	Simarjeet S. Saini, Reza Kohandani
Rok vydání:	2020
Předmět:	Materials science business.industry Biophysics Physics::Optics Fano resonance 02 engineering and technology Grating 021001 nanoscience & nanotechnology 01 natural sciences Biochemistry 010309 optics Wavelength 0103 physical sciences Optoelectronics Nanometre Surface plasmon resonance 0210 nano-technology business Lithography Refractive index Plasmon Biotechnology
Zdroj:	Plasmonics. 15:1359-1368
ISSN:	1557-1963 1557-1955
DOI:	10.1007/s11468-020-01155-1
Popis:	A self-referencing plasmonic platform is proposed and analyzed. By introducing a thin gold layer below a periodic two-dimensional nano-grating, the structure supports multiple modes including localized surface plasmon resonance (LSPR), surface plasmon resonance (SPR), and Fabry-Perot resonances. These modes get coupled to each other creating multiple Fano resonances. A coupled mode between the LSPR and SPR responses is spatially separated from the sensor surface and is not sensitive to refractive index changes in the surrounding materials or surface attachments. This mode can be used for self-referencing the measurements. In contrast, the LSPR dominant mode shifts in wavelength when the refractive index of the surrounding medium is changed. The proposed structure is easy to fabricate using conventional lithography and electron beam deposition methods. A bulk sensitivity of 429 nm/RIU is achieved. The sensor also has the ability to detect nanometer thick surface attachments on the top of the grating.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::0350218e400b6bc694e9d99f92094bae https://doi.org/10.1007/s11468-020-01155-1 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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