Design of a high-Q air-slot cavity based on a width-modulated line-defect in a photonic crystal slab
2008; Optica Publishing Group; Volume: 16; Issue: 18 Linguagem: Inglês
10.1364/oe.16.013809
ISSN1094-4087
AutoresTakayuki Yamamoto, Masaya Notomi, Hideaki Taniyama, Eiichi Kuramochi, Yutaka Yoshikawa, Yoshio Torii, Takahiro Kuga,
Tópico(s)Optical Coatings and Gratings
ResumoWe 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.
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