title: Slotted photonic crystal nanobeam cavity with an ultrahigh quality factor-to-mode volume ratio.
abstract: We describe the design, fabrication, and characterization of a 1-dimensional silicon photonic crystal cavity with a quality factor-to-mode volume ratio greater than 10(7), which exceeds the highest previous values by an order of magnitude. The maximum of the electric field is outside the silicon in a void formed by a central slot. An extremely small calculated mode volume of 0.0096 (λvac/n)(3) is achieved through the abrupt change of the electric field in the slot, despite which a high quality factor of 8.2 × 10(5) is predicted by simulation. Quality factors up to 1.4 × 10(5) are measured in actual devices. The observation of pronounced thermo-optic bistability is consistent with the strong confinement of light in these cavities.
authors: Paul
authors: P
authors: Seidler
authors: Kevin
authors: K
authors: Lister
authors: Ute
authors: U
authors: Drechsler
authors: Jens
authors: J
authors: Hofrichter
authors: Thilo
authors: T
authors: Stöferle