期刊
APPLIED PHYSICS LETTERS
卷 105, 期 6, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4867254
关键词
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资金
- Rowland Institute at Harvard
- National Natural Science Foundation of China [61372038]
- National 973 Program [2012CB315705]
- BUPT Excellent Ph.D. Students Foundation, P. R. China [CX201212, CX201331]
- China Scholarship Council (CSC) [201206470026]
- AFOSR [FA9550-09-1-0669-DOD35CAP]
We experimentally demonstrate a label-free sensor based on nanoslotted parallel quadrabeam photonic crystal cavity (NPQC). The NPQC possesses both high sensitivity and high Q-factor. We achieved sensitivity (S) of 451 nm/refractive index unit and Q-factor >7000 in water at telecom wavelength range, featuring a sensor figure of merit >2000, an order of magnitude improvement over the previous photonic crystal sensors. In addition, we measured the streptavidin-biotin binding affinity and detected 10 ag/mL concentrated streptavidin in the phosphate buffered saline solution. (C) 2014 AIP Publishing LLC.
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