Journal
MODERN PHYSICS LETTERS B
Volume 37, Issue 26, Pages -Publisher
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S0217984923500938
Keywords
Nanosensor; bimetallic nanoshell; localized surface plasmon
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Due to the increasing importance of nanosensors in the early diagnosis of diseases, researchers propose a structure consisting of plasmonic nanoshells with spherical and ellipsoidal geometry to calculate the refractive index changes. The sensitivity of the nanosensor is computed and factors such as geometry, material, dimensions, thickness, and surrounding environment are studied. The results show that ellipsoidal nanoshells are more sensitive to RI changes, and bimetallic nanoshells can exponentially increase the sensitivity of the nanosensor.
Due to the increasing importance of nanosensors in the early diagnosis of diseases, the need for high-performance nanosensors is one of the goals of researchers. In this paper, a structure consisting of plasmonic nanoshells with spherical and ellipsoidal geometry has been proposed to calculate the refractive index (RI) changes in the range of 1-3. The sensitivity of the proposed nanosensor has been computed, and the effective factors on the performance of the nanosensor, including geometry, material, core dimensions, shell thickness, and RI of the surrounding environment are studied. To this end, various nanostructures have been modeled using the boundary element method. It has been shown that ellipsoidal nanoshells are more sensitive to RI changes than spherical nanoshells. Also, the results show that nanoshells with a core and shell made of plasmonic metals (bimetallic nanoshell) can exponentially increase the sensitivity of the nanosensor.
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