Figure 2

Density plot of the scaled LDOS of (a) a (20,16)nm nanoshell versus frequency ω and the dielectric permittivity of the core ε_c when ε_b = 1.78 and (b) a (20, 16) nm nanoshell versus frequency ω and the dielectric permittivity of the background medium ε_b when ε_c = 5.4.