Yang Daquan, Tian Huiping, Ji Yuefeng
The State Key Laboratory of Information Photonics and Optical Communications, Beijing 100876, China.
Opt Express. 2011 Oct 10;19(21):20023-34. doi: 10.1364/OE.19.020023.
We present nanoscale photonic crystal sensor arrays (NPhCSAs) on monolithic substrates. The NPhCSAs can be used as an opto-fluidic architecture for performing highly parallel, label-free detection of biochemical interactions in aqueous environments. The architecture consists of arrays of lattice-shifted resonant cavities side-coupled to a single PhC waveguide. Each resonant cavity has slightly different cavity spacing and is shown to independently shift its resonant peak (a single and narrow drop) in response to the changes in refractive index. The extinction ratio of well-defined single drop exceeds 20 dB. With three-dimensional finite-difference time-domain (3D-FDTD) technique, we demonstrate that the refractive index sensitivity of 115.60 nm/RIU (refractive index unit) is achieved and a refractive index detection limit is approximately of 8.65×10-5 for this device. In addition, the sensitivity can be adjusted from 84.39 nm/RIU to 161.25 nm/RIU by changing the number of functionalized holes.
我们展示了在单片衬底上的纳米级光子晶体传感器阵列（NPhCSAs）。NPhCSAs可用作光流体结构，用于在水性环境中对生化相互作用进行高度并行、无标记检测。该结构由与单个光子晶体（PhC）波导侧面耦合的晶格移位谐振腔阵列组成。每个谐振腔具有略有不同的腔间距，并且显示出响应于折射率的变化而独立地移动其谐振峰（单个且狭窄的下降）。明确的单个下降的消光比超过20 dB。利用三维时域有限差分（3D-FDTD）技术，我们证明该器件实现了115.60 nm/RIU（折射率单位）的折射率灵敏度，折射率检测极限约为8.65×10-5。此外，通过改变功能化孔的数量，灵敏度可从84.39 nm/RIU调整到161.25 nm/RIU。
