Effect of core size/shape on the plasmonic response of spherical ZnO@Au core-shell nanostructures embedded in a passive host-matrices of MgF<sub>2</sub>

Gashaw Beyene; Gamachis Sakata; Teshome Senbeta; Belayneh Mesfin; Gashaw Beyene; Gamachis Sakata; Teshome Senbeta; Belayneh Mesfin

doi:10.3934/matersci.2020.6.705

AIMS Materials Science

2020, Volume 7, Issue 6: 705-719. doi: 10.3934/matersci.2020.6.705

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Effect of core size/shape on the plasmonic response of spherical ZnO@Au core-shell nanostructures embedded in a passive host-matrices of MgF₂

1.
Department of Physics, Addis Ababa University, Addis Ababa, Ethiopia
2.
Applied Physics Program, Adama Science and Technology University, Adama, Ethiopia
3.
Department of Physics, Metu University, Metu, Ethiopia

Received: 25 August 2020 Accepted: 13 October 2020 Published: 30 October 2020

In this paper, we investigated the effect of shape and size of core on the plasmonic response of spherical ZnO@Au core-shell nanostructures embedded in a passive host matrices of MgF₂ within the framework of the qausistatic approximation. The absorption cross-section and local field enhancement factor of spherical ZnO@Au core-shell nanostructures are effectively studied by optimizing the parameters for a fixed composite diameter of 20 nm. In this two-layered core-shell nanostructures, four plasmonic resonances are found; the first two resonances associated with ZnO/Au and Au/MgF₂ interfaces, whereas the third and fourth resonances are associated with the transverse and longitudinal modes, respectively. The peaks position and intensity of these resonances are varied by optimizing the shape and size of the core material. The tunability of the plasmon resonances of the composite systems enables it to exhibit very interesting material properties in a variety of applications extending from the visible to infrared spectral regions.
- host-matrix,
- spherical core-shell,
- surface plasmon resonance,
- absorption cross-section,
- dielectrics function,
- polarizability
Citation: Gashaw Beyene, Gamachis Sakata, Teshome Senbeta, Belayneh Mesfin. Effect of core size/shape on the plasmonic response of spherical ZnO@Au core-shell nanostructures embedded in a passive host-matrices of MgF2[J]. AIMS Materials Science, 2020, 7(6): 705-719. doi: 10.3934/matersci.2020.6.705

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Abstract

In this paper, we investigated the effect of shape and size of core on the plasmonic response of spherical ZnO@Au core-shell nanostructures embedded in a passive host matrices of MgF₂ within the framework of the qausistatic approximation. The absorption cross-section and local field enhancement factor of spherical ZnO@Au core-shell nanostructures are effectively studied by optimizing the parameters for a fixed composite diameter of 20 nm. In this two-layered core-shell nanostructures, four plasmonic resonances are found; the first two resonances associated with ZnO/Au and Au/MgF₂ interfaces, whereas the third and fourth resonances are associated with the transverse and longitudinal modes, respectively. The peaks position and intensity of these resonances are varied by optimizing the shape and size of the core material. The tunability of the plasmon resonances of the composite systems enables it to exhibit very interesting material properties in a variety of applications extending from the visible to infrared spectral regions.

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