Numerical investigation of all-optical tunable gyroscope using photonic crystal in nonlinear nanostructures for rotation sensing applications

In this article, the design and numerical analysis of an all-optical tunable gyroscope using photonic crystal in nonlinear nanostructures for rotation sensing applications is investigated. In this proposed structure, the lattice constant, the filling factor, footprint, the radius of the rods and the refractive index of the silicon rods are set as 528 nm, 0.2, 240 µm², 103 nm and 3.46, respectively. In this design, according to the changes in the ratio of output power to input power, the output phase shift is estimated. Due to the creation of nonlinear effects in the coupling rods by increasing the input power to the gyroscope, the output power has decreased in the range of the appearance of the nonlinear effect. The value of nonlinear refractive index in silicon coupling rods is considered 4.47 × 10 ^− 18 m²/W. With the increase of input power, the phase change is almost constant and changes in the range of 120 degrees. In the situation where the nonlinear effects in the structure are activated by increasing the input power, the phase change has a decreasing trend due to the decrease in the output power. This decreasing trend changes from the range of 120° to 44°. According to this phase change, the angular rotation of the gyroscope changes in the range of 78 × 10⁷ deg/h to 200 × 10⁷ deg./h.