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Author: Cecilia Noguez
Requested Type: Oral
Submitted: 2015-03-12 17:34:02

Co-authors: Rafael D.H. Rojas, Raul Esquivel-Sirvent

Contact Info:
UNAM
Instituto de Fisica, Apdo. Pos
Mexico, DF   01000
Mexico

Abstract Text:
Tuning of plasmonic properties of nanoparticles can be achieved by changing shape, size, dielectric function and surrounding environment. Another way of varying the plasmonic properties is combining two or more of the above parameters, for instance, by using metallic nanoshells made of a dielectric core surrounded by a metallic shell or a dielctric core surrounded by alternate shells of metal and dielectrics (nanomatryushkas), and etc. Here, the plasmonic response of nanoshells with different geometries is obtained by using an effective medium theory (EMT) within the quasi static limit. The case of multishell nanospheres, spheroids, as well as nested nanocubes are investigated. The model is extended to study confocal and nonconfocal ellipsoidal nanoshells, as well to study the combination of nested nanospheres with nanospheroids and/or nanocubes. As compared with more computer-intensive methods, such as finite difference time domain method (FDTD) or discrete dipole approximation (DDA), the modified EMT gives fast and accurate results, as compared with experiments and other methodologies.

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