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High-Q Impurity Photon States Bounded by a Photonic Band Pseudogap in an Optically Thick Photonic Crystal Slab

Research Area: Nanophotonics Year: 2012
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
Number: 24 Pages: 245114
Month: December
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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