title: High-Q hybrid 3D-2D slab-3D photonic crystal microcavity.
abstract: The radiation loss in the escaping light cone with a two-dimensional (2D) photonic crystal slab microcavity can be suppressed by means of cladding the low-Q slab microcavity by three-dimensional woodpile photonic crystals with the complete bandgap when the resonance frequency is located inside the complete bandgap. It is confirmed that the hybrid microcavity based on a low-Q, single-defect photonic crystal slab microcavity shows improvement of the Q factor without affecting the mode volume and modal frequency. Whereas 2D slab microcavities exhibit Q saturation with an increase in the number of layers, for the analyzed hybrid microcavities with a small gap between the slab and woodpiles, the Q factor does not saturate.
authors.affiliation: Department of Electrical and Computer Engineering, Fitzpatrick Institute for Photonics, Duke University, Durham, North Carolina 27708-0291, USA. lingling.tang@duke.edu
authors.forename: Lingling
authors.initials: L
authors.lastname: Tang
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Yoshie