Nanocavity Waveguide in Two-Dimensional Photonic Crystal Structure

In this paper, we design a nanocavity waveguide in a two-dimensional (2D) photonic crystal (PhC) structure. Defects have been introduced in the structure of the PhC, namely as cavities. To smoothly localize light in the cavity, the photonic bandgap, transmission spectrum, and resonance modes of the structure have been investigated. In this study, the photonic bandgap, transmission spectrum, and resonance modes of the cavity were analyzed using the Finite-Difference Time-Domain (FDTD) analysis technique. The quality (Q) factor values have been utilized to calculate the light confinement within the cavity structure. With 90 % transmission efficiency, we determined that the Q factor value is approximately ~10
⁵
. This device has the potential to be implemented as passive and active silicon photonics devices due to the advantages of strong light confinement and the small mode volume of the structure.