Dear Meep Users, I have doubt on the interpretation and convention of Q-factor and its calculation. It is well known that the harminv gives the resoant modes, their decay rates and Quality factors of a cavity system accurately.
Especially for a photonic cavity, the intrinsic Q factor are of the order of 10^7 to 10^9. MEEP(Harminv) and other commercial software such as CST gives this Q-factor (analyzing pulse decay inside the cavity) correctly. However, the spectroscopic Q-factor (Q=f/del(f)) is always very lesser than the Q(energy decay). I request anyone to tell about the differences between the Q-factor formulas and its origin and usage. For example, is it correct to say that Q=f/del(f) is coupled or a loaded Q-factor ? -- N. Yogesh. Research Scholar, Microwave Lab, Dept. of Physics, IIT Madras, Chennai, INDIA.
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