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Enhanced plasmonic behavior of bimetallic (Ag-Au) multilayered spheres.

Peña-Rodríguez O, Pal U - Nanoscale Res Lett (2011)

Bottom Line: In this article we study the plasmonic behavior of some stable, highly biocompatible bimetallic metal-dielectric-metal (MDM) and double concentric nanoshell (DCN) structures.By simply switching the material of the inner structure from Au to Ag, the intensity of their surface plasmon resonance could be increased in the optical transparency region of the human tissues up to 20 and 60 percent for the MDM and DCN, respectively, while the biocompatibility is retained.The obtained results indicate that these novel structures could be highly suitable for surface enhanced Raman scattering and photothermal cancer therapy.

View Article: PubMed Central - HTML - PubMed

Affiliation: Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, Bellaterra, Barcelona, 08193, Spain. ovidio@bytesfall.com.

ABSTRACT
In this article we study the plasmonic behavior of some stable, highly biocompatible bimetallic metal-dielectric-metal (MDM) and double concentric nanoshell (DCN) structures. By simply switching the material of the inner structure from Au to Ag, the intensity of their surface plasmon resonance could be increased in the optical transparency region of the human tissues up to 20 and 60 percent for the MDM and DCN, respectively, while the biocompatibility is retained. The obtained results indicate that these novel structures could be highly suitable for surface enhanced Raman scattering and photothermal cancer therapy.

No MeSH data available.


Schematic representation of the MDM and DCN structures. (a) Schematic representation of the studied MDM and DCN structures (for the MDM r0 = t0 = 0) and (b) their corresponding energy diagrams, representing plasmon hybridization.
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Figure 1: Schematic representation of the MDM and DCN structures. (a) Schematic representation of the studied MDM and DCN structures (for the MDM r0 = t0 = 0) and (b) their corresponding energy diagrams, representing plasmon hybridization.

Mentions: In the present article, we have studied bimetallic MDM structures and DCNs with geometries as shown in Figure 1a, where ri and ti (i = 0, ..., 3) are the radii and thicknesses of the ith layer (for the MDM structure r0 = t0 = 0). The extinction efficiencies for the different configurations were calculated by means of Scattnlay [28], a computer implementation of the algorithm developed by Yang [31] for the calculation of the scattering of EM radiation by a multilayered sphere. Moreover, in order to explain the observed shifts of the SPR, we have used a complementary, mainly qualitative method which has been developed recently: the theory of plasmon hybridization [20]. In this approach the characteristics of the SPR are explained in terms of the interactions between the plasmons of metallic nanostructures with simpler shapes. For instance, the SPR of metallic nanoshells can be understood from the coupling between the plasmons modes of a sphere (/ωs〉) and a cavity (/ωc〉), where two new plasmon oscillation modes are created: a higher energy (antibonding) mode (/ω+〉) and a lower energy (bonding) mode (/ω-〉), corresponding to the antisymmetric and symmetric interactions between the /ωs〉 and /ωc〉 modes, respectively.


Enhanced plasmonic behavior of bimetallic (Ag-Au) multilayered spheres.

Peña-Rodríguez O, Pal U - Nanoscale Res Lett (2011)

Schematic representation of the MDM and DCN structures. (a) Schematic representation of the studied MDM and DCN structures (for the MDM r0 = t0 = 0) and (b) their corresponding energy diagrams, representing plasmon hybridization.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211343&req=5

Figure 1: Schematic representation of the MDM and DCN structures. (a) Schematic representation of the studied MDM and DCN structures (for the MDM r0 = t0 = 0) and (b) their corresponding energy diagrams, representing plasmon hybridization.
Mentions: In the present article, we have studied bimetallic MDM structures and DCNs with geometries as shown in Figure 1a, where ri and ti (i = 0, ..., 3) are the radii and thicknesses of the ith layer (for the MDM structure r0 = t0 = 0). The extinction efficiencies for the different configurations were calculated by means of Scattnlay [28], a computer implementation of the algorithm developed by Yang [31] for the calculation of the scattering of EM radiation by a multilayered sphere. Moreover, in order to explain the observed shifts of the SPR, we have used a complementary, mainly qualitative method which has been developed recently: the theory of plasmon hybridization [20]. In this approach the characteristics of the SPR are explained in terms of the interactions between the plasmons of metallic nanostructures with simpler shapes. For instance, the SPR of metallic nanoshells can be understood from the coupling between the plasmons modes of a sphere (/ωs〉) and a cavity (/ωc〉), where two new plasmon oscillation modes are created: a higher energy (antibonding) mode (/ω+〉) and a lower energy (bonding) mode (/ω-〉), corresponding to the antisymmetric and symmetric interactions between the /ωs〉 and /ωc〉 modes, respectively.

Bottom Line: In this article we study the plasmonic behavior of some stable, highly biocompatible bimetallic metal-dielectric-metal (MDM) and double concentric nanoshell (DCN) structures.By simply switching the material of the inner structure from Au to Ag, the intensity of their surface plasmon resonance could be increased in the optical transparency region of the human tissues up to 20 and 60 percent for the MDM and DCN, respectively, while the biocompatibility is retained.The obtained results indicate that these novel structures could be highly suitable for surface enhanced Raman scattering and photothermal cancer therapy.

View Article: PubMed Central - HTML - PubMed

Affiliation: Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, Bellaterra, Barcelona, 08193, Spain. ovidio@bytesfall.com.

ABSTRACT
In this article we study the plasmonic behavior of some stable, highly biocompatible bimetallic metal-dielectric-metal (MDM) and double concentric nanoshell (DCN) structures. By simply switching the material of the inner structure from Au to Ag, the intensity of their surface plasmon resonance could be increased in the optical transparency region of the human tissues up to 20 and 60 percent for the MDM and DCN, respectively, while the biocompatibility is retained. The obtained results indicate that these novel structures could be highly suitable for surface enhanced Raman scattering and photothermal cancer therapy.

No MeSH data available.