Radhika V. Nair, Anandajith T. S., Anagha Umesh Menon
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引用次数: 0
Abstract
Ellipsoidal plasmonic particles are of huge importance in the biosensing field due to their orientation-specific light scattering properties and higher area of surface-adhesive interactions. In this paper, we present a computational investigation of the orientation-specific plasmonic properties of graphene-wrapped—Au nano ellipsoids of various aspect ratios and graphene layer thicknesses using the discontinuous Galerkin time domain (DGTD) method. We could observe that both the dipolar and quadrapolar resonances of Au ellipsoids are strongly modulated by graphene layer. Furthermore, we have modelled graphene wrapped Au ellipsoidal nanoarray biosensor with optimized orientation having very high sensitivity (484 nm/RIU) towards refractive index changes associated with various fibrillation stages of beta amyloid (biomarker for Alzheimer’s disease) compared to the bare Au nanoellipsoidal biosensor.
期刊介绍：
Plasmonics is an international forum for the publication of peer-reviewed leading-edge original articles that both advance and report our knowledge base and practice of the interactions of free-metal electrons, Plasmons.
Topics covered include notable advances in the theory, Physics, and applications of surface plasmons in metals, to the rapidly emerging areas of nanotechnology, biophotonics, sensing, biochemistry and medicine. Topics, including the theory, synthesis and optical properties of noble metal nanostructures, patterned surfaces or materials, continuous or grated surfaces, devices, or wires for their multifarious applications are particularly welcome. Typical applications might include but are not limited to, surface enhanced spectroscopic properties, such as Raman scattering or fluorescence, as well developments in techniques such as surface plasmon resonance and near-field scanning optical microscopy.
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