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The penetration depth in a Distributed Bragg Reflector (DBR) co-determinesthe resonance condition, quality factor, and mode volume of DBR-basedmicrocavities. Recent studies have used an incomplete description of thepenetration depth and incorrect equations. We present a complete analysis thatinvolves three different penetration depths. We also present a series ofexperiments on microcavities to accurately determine the frequency and modalpenetration depth of our DBRs and compare these results with theoreticalpredictions. The obtained results are relevant for anyone who models a DBR asan effective hard mirror if lengths of the order of the wavelength arerelevant, as is the case for microcavities.

Microcavity resonance condition, quality factor, and mode volume are determined by different penetration depths