Title: Enhancement of local electric field in core-shell orientation of ellipsoidal metal/dielectric nanoparticles
Author(s):

	A.A. Ismail (Department of Physics, Addis Ababa University, P O Box 1176, Addis Ababa, Ethiopia) ,
	A.V. Gholap (Department of Physics, Addis Ababa University, P O Box 1176, Addis Ababa, Ethiopia) ,
	Y.A. Abbo (Department of Physics, Wollega University, P O Box 395, Nekemt, Ethiopia)

In this paper it is shown that the enhancement factor of the local electric field in metal covered ellipsoidal nanoparticles embedded in a dielectric host matrix has two maxima at two different frequencies. The second maximum for the metal covered inclusions with large dielectric core (small metal fraction p) is comparatively large. This maximum strongly depends on the depolarization factor of the core L_z⁽¹⁾, keeping that of the shell L_z⁽²⁾ constant and is less than L_z⁽¹⁾. If the frequency of the external radiation approaches the frequency of surface plasmons of a metal, the local field in the particle considerably increases. The importance of maximum value of enhancement factor |A|² of the ellipsoidal inclusion is emphasized in the case where the dielectric core exceeds metal fraction of the inclusion. The results of numerical computations for typical small silver particles are presented graphically.

Key words: enhancement factor, ellipsoidal nanoinclusion, depolarization factor, local field, resonant frequency
PACS: 42.65.Pc, 42.79.Ta, 78.67.Sc, 78.67.-n

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