In this work, we introduce a spatial filtering mechanism that can be effectively utilized by photonic crystals. The phenomenon utterly expressed here is Rayleigh-Wood’s anomaly. Such a mechanism is realized and optimized via RCWA (Rigorous Coupled Wave Analysis) together with a global optimization algorithm for both s and p polarized inputs. The calculated transmission and reflection spectra of such mechanisms show that the Rayleigh anomaly provides the necessary sharp transmission profile near the critical wavelength from which the diffraction can occur.
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