According to theoretical principles, the Q-factor should be calculated based on the Full Width at Half Maximum (FWHM) of the resonance obtained. Failure to adhere to this principle may necessitate validation of the result. This involves confirming whether the values derived from both the formula and simulation align. Similar challenges arise when using Lumerical, particularly in 2D Photonic Crystal (PhC) structures with line defects and cavities positioned at the center of the waveguide.
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