Dear Steven and all, Suddenly a weird idea came to my mind. Generally speaking the epsilon or refractive index is considered to be intensity-dependent for Kerr material. If the pump light is finite in time just like a pulse, then the epsilon or refractive index of the material will show a kind of time variation induced by the pump light. So with meep can I directly establish a time-varying function for the epsilon? Is this possible, just equivalently like a kind of Kerr nonlinearity without the pump field? Many thanks for your suggestions and help. Yours sincerely. Zi-Ming Meng
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