Abstract- In this paper, wavelength, quality factor (Q) and confined mode distribution in the photonic crystal nanobeam cavity containing tapers with 4 air-holes nearby parabolic form narrowed nanocavity with couple of 9 air-holes mirrors are investigated. A high-Q mode was chosen to be created and enhanced by changing structural parameters of the nanobeam cavity. Variation of lattice constant and tapers, and number of air-holes in the mirrors offer improvements in the quality factors. The Q-values as high as 10410 are obtained by hiring couple of the tapers which their 4 air-holes centers have 25 nm reductions in positions. The results showed that the increasing in the Q-values occur as a consequence of more concentration of mode in the combined parabolic shape nanocavity and air-hole centers displaced tapers, and therefore reduction in diffraction and modal volumes.

Keywords: Photonic Crystal, Fabry- Pérot, Quality Factor, Parabolic Nanobeam, Taper Air-Holes, COMSOL Multiphysics.

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