Figure 1.

Absorption coefficient (colored lines) as a function of photon energy. Solid lines are for α1(ω). Dashed lines are for α3(ω,I), and dotted lines are for α(ω,I) = α1(ω) + α3(ω,I). The results are for R2 = 20 nm, L = 20 nm, P = 0, F = 0, and I = 2×104W/cm2. Several values of the inner radius have been considered.

Barseghyan et al. Nanoscale Research Letters 2012 7:538   doi:10.1186/1556-276X-7-538
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