期刊
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
卷 31, 期 8, 页码 1746-1752出版社
OPTICAL SOC AMER
DOI: 10.1364/JOSAB.31.001746
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资金
- NSFC [61372038]
- National 973 Program [2012CB315705]
- National 863 Program [2011AA010306]
- Postgraduate Innovation Fund of SICE, BUPT, Fund of State Key Laboratory of Information Photonics and Optical Communications (Beijing University of Posts and Telecommunications) China
We demonstrate refractive index sensing using parallel tapered nano-slotted photonic-crystal nano-beam cavities with three-dimensional (3D) finite-difference time-domain (3D-FDTD) simulation. The electric field of the cavity mode is strongly concentrated in the slot region leading to a large light-matter overlap, which is expected to add a significant contribution to sensitivity, and thus we present high refractive-index sensitivity of more than 600 nm/refractive index units. Additionally, the quality (Q)-factor in the proposed design is theoretically investigated, and through tapering the diameter of the pores outside the Bragg mirrors in nano-beam cavities and the width of the adjacent nano-slots, an optimal Q-factor of 11770 is obtained. A high figure of merit (FOM = 4637) of the designed model has been obtained. We anticipate that this geometry is potentially an ideal platform for refractive-index based bio-sensing. (C) 2014 Optical Society of America
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