Dear meep users, By the 3D simulation using MEEP, the transmission property at wavelengths 500~1000nm of 2D periodic array of Au nanoholes has now been achieved, from which an obvious SP resonant wavelength is observed. To theoretically verify the simulation results, the commonly used formula, lambda(SP) = a / sqrt ( i^2 + j^2 ) * sqrt ( epsilon(Au) * epsilon(dielectric) / ( epsilon(Au) + epsilon(dielectric ) ) ), is employed. (a is the array periodicity.)
Then, a question occurs: for the theoretical calculation, how should I set the permittivity of gold? As it is a variable value depending on the wavelength, the permittivity of which wavelength is appropriate for this purpose? Any comments and suggestions are welcomed, and will be highly appreciated. Thanks in advance. Tony Post-doc researcher Freiburg University, Germany
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