spline interpolation of permittivity
Methods
fun(wavelength, ...)returns a continuous function of the wavelength
permittivity(new.wavelength, ...)predict a single value
predict( sp = NULL, range = span, n = length(epsilon), new.wavelength = NULL, ... )interpolation with splines
raw(range = span)return the raw data as real numbers
spline(...)returns a list of splinefun for the real and imaginary parts