title: A 1.16-μm-radius disk cavity in a sunflower-type circular photonic crystal with ultrahigh quality factor.
abstract: We present a 1.16-μm-radius disk cavity with ultrahigh quality (Q) factor by embedding the disk into a sunflower-type circular photonic crystal (CPC). The bandgap of the CPC reduces the bending loss of the whispering-gallery mode of the disk, leading to a simulated Q of 10(7), at least an order of magnitude higher than a bare disk of the same size. The design is experimentally verified with a record high loaded Q of 7.4×10(5) measured from an optimized device fabricated on a silicon-on-insulator substrate.
authors.affiliation: Department of Electrical Engineering, Yale University, New Haven, Connecticut 06511, USA.
authors.forename: Xufeng
authors.initials: X
authors.lastname: Zhang
authors.forename: Xiankai
authors.initials: X
authors.lastname: Sun
authors.forename: Hong X
authors.initials: HX
authors.lastname: Tang
mesh_terms: D049329:Nanostructures / Q000737:chemistry*; D055096:Optical Devices; D017785:Photons; D012825:Silicon / Q000737:chemistry
chemical_list: D012825:Silicon