A novel biosensor with enhanced sensitivity based on grating coupled double-layered porous silicon waveguide  

作　　者：吕小毅 莫家庆 张红燕 钟福如 贾振红 

机构地区：[1]Postdoctoral Station of Computer Science and Technology,Xinjiang University [2]Colleges of Information Science and Engineering,Xinjiang University [3]School of Electronic and Information Engineering,Xi'an Jiaotong University [4]School of Physics,Xinjiang University

出　　处：《Optoelectronics Letters》2012年第3期179-181,共3页光电子快报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No.60968002);the China Postdoctoral Science Foundation (No.2011M501501)

摘　　要：The enhanced sensitivity of a guided mode biosensor is analyzed by employing double-layered porous silicon grating structures. The grating-coupled waveguide structure consists of two porous silicon grating layers with different refractive indices. simulations are carried out by changing the refractive index, which is due to the binding of biological molecules on the porous silicon pore can increase the refractive index of porous silicon. The numerical results show that this novel guided mode biosensor with a double-layered grating can provide not only a very high sensitivity but also a better reflectivity characteristic.

关 键 词：Guided electromagnetic wave propagation Porous silicon Refractive index WAVEGUIDES 

分 类 号：TP212.3[自动化与计算机技术—检测技术与自动化装置]