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Numerical analysis of tunable defect mode in cylindrical photonic crystals configuration


Sahar A. El-Naggar, Truong K. Nguyen, Vigneswaran Dhasarathan*

Source title: 
Microwave and optical technology letters, 2020 (ISI)
Academic year of acceptance: 

In contrast to most of the previous publications that has addressed the dependency of the defect mode on temperature in planner one-dimensional photonic crystal, we study this dependency in cylindrical photonic crystal taking into consideration both thermal-optical and thermal expansion effects. Our analysis, based on the cylindrical transfer matrix, is conducted for both types of polarized electric and magnetic waves. Our structure is composed of arrays of cylindrical coaxial shells of TiO2 and Al2O3 with single defect layer. Numerical results show that the defect mode's wavelength can be effectively tuned, following a linear relation, by changing the temperature for both types of polarized waves. In addition, the peak transmittance is dependent on the number of periods and the starting inner radius. Moreover, decreasing the inner radius is associated with separation between the two polarizations.