When terahertz radiation irradiate to the surface of metal sub-wavelength holes array, there will be transmission peak at
some frequency because of the surface plasmon resonant. This is the property of selecting transmission of metal
sub-wavelength holes array. Many factors affect this property, such as the lattice constant of the array, dielectric of the
medium, the thickness of the medium and so on. We mainly discuss the influence of the frequency and intensity of the
transmission peak by the thickness of the medium. When the medium film is attached to both sides of the array, we
found the changing of the thickness of the medium affect the frequency and intensity of the transmission peak: When the
thickness of the medium is increasing, the frequency of the transmission peak becomes lower and the intensity decreases.
We also found that when the film is thin (for example 54μm), the intensity of the transmission peak is greater than that of
no medium film. This phenomenon shows that attaching thin film to both sides of the holes array will enhance the
selecting transmission property.
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