Hi Aaron, > 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. > > > If you only want to verify that you've matched the SP resonance condition, > it's > probably good enough to use the permittivity at a single wavelength. Of > course, > make sure that the theoretical value is the one meep is using. >
Thank you for your reply. I know your meaning, and that's exactly what I want to do now. However, the question is: which single wavelength is appropriate for such purpose? Because the permittivity of gold depends on the wavelength. I have tried a series of calculations with different wavelengths from the aimed spectrum (500~1000nm). The results for different wavelengths differ greatly. Looking forward to any further comments on this problem. Tony
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