Journal
IEEE PHOTONICS TECHNOLOGY LETTERS
Volume 29, Issue 16, Pages 1281-1284Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2016.2542347
Keywords
Photonic crystal; resonators; optical sensing and sensor
Funding
- National 973 Program [2012CB315705]
- SICE, Beijing University of Posts and Telecommunications (BUPT), China
- BUPT Excellent Ph.D. Students Foundation [CX2015202]
- State Key Laboratory of Information Photonics and Optical Communications, BUPT, China [IPOC2015ZC02]
- National Natural Science Foundation of China [61372038]
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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 x 10(7) has been obtained. Successive infiltrations by liquids with different refractive indices yield a high bulk sensitivity of 415 nm/RIU. A high figure of merit of 4122 and the ultra-compact sensing part of 11.2 mu mx0.8 mu m are obtained, which is potentially an ideal platform for lab-on-chip sensors array.
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