Cavity modes are a consequence of constructive interference of EM waves in a particular region. It is common knowledge that the (frequency) linewidth of a cavity resonance is broadened by both homogeneous (energy loss/damping) and inhomogeneous (non-uniform environment) effects. The linewidth due to homogeneous damping is inversely proportional to the lifetime of the cavity mode. I believe that 'integral intensity' of the resonance uniquely defines how much energy is within the mode, and that the integral intensity and the linewidth in combination uniquely define the amplitude of the mode.

I am curious about resonances of destructive interference. They can also be characterized by a linewidth, integral intensity, and an amplitude. However, in this case, the resonance corresponds to the absence of EM modes at a particular frequency. What do linewidth, integral intensity, and amplitude indicate for a resonance of destructive interference? It should be pretty similar, because both cavity modes and destructive interference resonances are the consequence of interference, the only difference is whether the interference is constructive or destructive.

Maybe there are some texts of spectral analysis or characterization of resonances that could help clarify this?

Thanks!

-Ryan

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