title: Design of a high-Q air-slot cavity based on a width-modulated line-defect in a photonic crystal slab.
abstract: We have presented a novel design of a photonic crystal slab (PCS) nanocavity, in which the electric field of the cavity mode is strongly localized in free space. The feature of the cavity is a linear air slot introduced to the center of the mode-gap confined PCS cavity. Owing to the discontinuity of the dielectric constant, the electric field of the cavity mode is strongly enhanced inside the slot, allowing strong matter-field coupling and large interaction volume in free space. Using finite-difference time-domain method, we calculate the properties of the cavity mode as a function of the slot width. The calculated quality factor is still as high as 2 x 10(5) and the mode volume is as small as 0.14 of a cubic wavelength in a vacuum, even if 200-nm-wide slot is introduced to the PCS.
authors.affiliation: Institute of physics, University of Tokyo, Komaba, Tokyo, Japan. tyamamoto@photon.c.u-tokyo.ac.jp
authors.forename: Takayuki
authors.initials: T
authors.lastname: Yamamoto
authors.forename: Masaya
authors.initials: M
authors.lastname: Notomi
authors.forename: Hideaki
authors.initials: H
authors.lastname: Taniyama
authors.forename: Eiichi
authors.initials: E
authors.lastname: Kuramochi
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Yoshikawa
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Torii
authors.forename: Takahiro
authors.initials: T
authors.lastname: Kuga
mesh_terms: D003198:Computer Simulation; D017076:Computer-Aided Design; D003460:Crystallization / Q000379:methods; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008962:Models, Theoretical; D055095:Optics and Photonics / Q000295:instrumentation*; D017785:Photons; D014159:Transducers