Lü Xiao-yi,Mo Jia-qing,Zhang Hong-yan,Zhong Fu-ru,Jia Zhen-hong.A novel biosensor with enhanced sensitivity based on grating coupled double-layered porous silicon waveguide[J].Optoelectronics Letters,2012,8(3):179-181 A novel biosensor with enhanced sensitivity based on grating coupled double-layered porous silicon waveguide Author Name Affiliation Lü Xiao-yi  Postdoctoral Station of Computer Science and Technology, Xinjiang University, Urumqi 830046, China  Mo Jia-qing  Colleges of Information Science and Engineering, Xinjiang University, Urumqi 830046, China；School of Electronic and Information Engineering, Xi’an Jiaotong University, Xi’an 710049, China  Zhang Hong-yan  School of Physics, Xinjiang University, Urumqi 830046, China  Zhong Fu-ru  Colleges of Information Science and Engineering, Xinjiang University, Urumqi 830046, China  Jia Zhen-hong  Colleges of Information Science and Engineering, Xinjiang University, Urumqi 830046, China  Abstract:       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. Hits: 4189 Download times: 549 This work has been supported by the National Natural Science Foundation of China (No.60968002) and the China Postdoctoral Science Foundation (No.2011M501501). View Full Text    Download reader