Abstract
Strong electric field enhancement in a metal nanoslit with THz field illumination is hardly calculated using the standard simulation packages. It is explained by the considerable difference of the values of nano sizes of the slit and the wavelength of the incident radiation (up to 10000 times). Therefore, significant computational resources or/and the home‐made simulation code is needed. We offer the simple single‐parameter model as an alternative to the time consuming calculations. The single parameter can be calculated either from the experimental or simulation data (one reference point is necessary to determine one parameter). Then we can find the field enhancement for different slit geometries and light wavelengths.
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