Design and modelling of the photonic crystal fano structure for all optical switching applications

Mohammad Hasan Rezaei | Mohammad Hasan Yavari

---

URL :   http://research.shahed.ac.ir/WSR/WebPages/Report/PaperView.aspx?PaperID=116663
Date :  2019/07/05
Publish in :    Optical and Quantum Electronics
DOI :  https://doi.org/10.1007/s11082-019-1954-1
Link :  http://dx.doi.org/10.1007/s11082-019-1954-1
Keywords :Optical switching, Photonic crystal switch, Fano switch, Non linear devices, All optical switching

Abstract :

---

In this paper, the optical Fano switch based on the 2D slab photonic crystal is analyzed. Switching characteristics are improved by manipulating the Q factors of cavities. Modified device with enhanced Fano resonance has lower energy consumption than other previous optical switches. Results show that, the switching contrast is enhanced while the quality factor has remained in its highest value. Therefore, the typical important trade off between switching contrast and quality factor has vanished in the modified structure. The switching contrast is improved from 7 to 34 db in constant Δ𝜆peak−peak of 0.3 nm in the modified structure which leads to decreasing the energy consumption of the device. In the previous devices, the maximum reported contrast is about 20 db for Δ𝜆peak−peak of 0.6 nm. A coupled mode theory for analyzing the structure is developed. The results of finite difference time domain numerical simulation are in good agreement with the theoretical coupled mode theory. Results show that the switching contrast of the modified Fano switch is enhanced two times, consequently the loss is suppressed and the bandwidth is improved.