Meep Tutorial/Local density of states

From AbInitio

In this example, we will investigate the Purcell enhancement of the local density of states (LDOS), computed in two different ways, for a microcavity. A lossless localized mode yeilds a δ-function spike in the LDOS, whereas a lossy (arising from either small absorption or radiation) localized mode -- a resonant cavity mode -- leads to a Lorentzian peak. The large enhancement in the LDOS at the resonant peak is known as a w: Purcell effect, named after Purcell's proposal for enhancing spotaneous emission of an atom in a cavity (analogous to a microwave antenna resonating in a metal box).