dispersion spectrum
    
    spectrum_dispersion(cluster, material, medium = 1.33, Incidence = 0,
  Axes = "z", polarisation = c("linear", "circular"), method = c("solve",
  "cg", "oos"), Nsca = 50, maxiter = 30, tol = 1e-04, progress = FALSE)
    
     Arguments
    
      - cluster
 
      - list describing a cluster
 
      - material
 
      - list
 
      - medium
 
      - medium refractive index
 
      - Incidence
 
      - angular directions of incident field
 
      - Axes
 
      - incident field rotation axis
 
      - polarisation
 
      - linear or circular polarisation
 
      - method
 
      - linear system (solve), conjugate-gradient (cg), or order-of-scattering (oos)
 
      - Nsca
 
      - number of quadrature points in calculation of csca
 
      - maxiter
 
      - integer termination of iterative solver
 
      - tol
 
      - double, tolerance of iterative solver
 
      - progress
 
      - logical, display progress bar
 
    
    
    Value
    data.frame
    
    Details
    dispersion spectrum
    
    Note
    The incident wavevector is along the z direction.