High quality factor polychromatic filters based on hybrid photonic structures

In this work, we have investigated theoretically the transmission properties of a hybrid quasi-periodic photonic system, which is a combination of a periodic H(LH)⁵ and a quasi-periodic multilayer structure(QPMS)^P: H(LH)⁵(QPMS)^PH(LH)⁵, where P is the repetitive number of QPMS. Simulation results showed that the number, position and the quality factor of the transmission peaks depend on the repetitive number (P) and the incident angle for both the (TE) and (TM) polarizations. Furthermore, we have studied the influence of two air layers (A) inside the previous structures at the 12^th and 29^th positions:H(LH)⁵A (QPMS)²A H(LH)⁵. The results illustrate that the introducing of the defect layers in our system provides a possible mechanism for optimizing the parameters of the transmission peaks, thus the obtaining of polychromatic filters with a high quality factor (Q) and with a minimum of layers and thickness.