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We describe the design and the characterization of high-$Q$ coupled photonic crystal nanobeam cavities for biosensing with 3-D finite-difference time-domain simulation. The majority of optical field localizes in the slotted low-index area, which contributes to a strong light-matter interaction. By introducing a parabolic modulated radius tapering structure, a calculated high quality factor of $1.14\times 10^{7}$ ...
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