Non-polarizing guided-mode resonance grating filter for telecommunications

Abstract A five-layer grating structure is designed to generate polarization-independent filter in the telecom band. It is demonstrated theoretically that in the five-layer grating structure, by adjusting the thickness of the interlayer sandwiched between two dielectric layers with high permittivity, the resonance wavelengths of transverse magnetic (TM)- and transverse electric (TE)-polarized light can locate at the same wavelength with the same guide-mode resonance structure parameters and the filter efficiency can achieve above 95%. The influence of incident angle and thickness of the interlayer on the shift of reflective peak are discussed. The peak locations for both TE and TM are proved to have a linear relation with the thickness of interlayer.

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