Fig. 1From: Properties of Longitudinal Electromagnetic Oscillations in Metals and Their Excitation at Planar and Spherical SurfacesReal (a) and imaginary (b) parts of the dielectric function of silver according to Johnson and Christy (◇) [20], Lynch and Hunter (+) [16], Weber (△) [21], Hao and Nordlander (dashed line) [22], and Drachev et al. (solid line) [23]Back to article page