Multilayered Nanostructure for Inducing a Large and Tunable Optical Field

Author(s): Jyoti Katyal*

Journal Name: Nanoscience & Nanotechnology-Asia

Volume 10 , Issue 6 , 2020


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Abstract:

Objective: The localized surface plasmon resonance (LSPR) and field enhancement of multilayered nanostructure over single and dimer configuration is studied using finite difference time domain (FDTD) method.

Experimental: In multilayered nanostructure, there exist concentric nanoshells and metallic core which are separated by a dielectric layer. Strong couplings between the core and nanoshell plasmon resonance modes show a shift in LSPR and enhancement in field around nanostructure. The calculation of the electric field enhancement shows a sharp increase in the electric field on the surface of inner core i.e., inside the dielectric layer of Metal-Dielectric-Metal (MDM) structure whereas smaller enhancement on the outer layer of MDM structure is observed.

Results: The Au-Air-Au mono MDM nanostructure shows strong near-field enhancement as compared to bare nanosphere in the infrared region, which have potential applications in surfaceenhanced spectroscopy, whereas Al-Air-Al and Ag-Air-Ag shows potential towards lower wavelength region. On coupling the MDM nanostructure forming a dimer configuration the field enhancement factor increases to 10^8.

Conclusion: As compared to other nanostructures, MDM nanostructure provides both strong field enhancement and wide wavelength tunability therefore promising for surface enhanced Raman spectroscopy (SERS) applications.

Keywords: Multilayered nanostructure, field enhancement, localized surface plasmon resonance, FDTD, MDM, nanoshell plasmon resonance.

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Article Details

VOLUME: 10
ISSUE: 6
Year: 2020
Published on: 30 November, 2020
Page: [840 - 848]
Pages: 9
DOI: 10.2174/2210681209666190828201612
Price: $25

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