|Type of Publication:||Article||Keywords:||photonic crystal, cavity, resonator, band gap, pseudogap, nanophotonics, nanofabrication, quality factor, purcell, thick slab|
|Authors:||Kim, Se-Heon; Homyk, Andrew; Walavalkar, Sameer; Scherer, Axel|
|Journal:||Physical Review B||Volume:||86|
We show that, taking a two-dimensional photonic crystal slab system as an example, surprisingly high quality factors (Q) over 10^5 are achievable, even in the absence of a rigorous photonic band gap. We find that the density of in-plane Bloch modes can be controlled by creating additional photon feedback from a finite-size photonic-crystal boundary that serves as a low-Q resonator. This mechanism enables significant reduction in the coupling strength between the bound state and the extended Bloch modes by more than a factor of 40.
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