Ultrasensitive biosensors based on long-range surface plasmon polariton and dielectric waveguide modes

作     者：Leiming Wu Jun Guo Hailin Xu Xiaoyu Dai Yuanjiang Xiang 

作者机构：SZU-NUS Collaborative Innovation Center for Optoelectronic Science & Technology Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Optoelectronic EngineeringShenzhen University College of Physics and Energy Shenzhen University 

出 版 物：《Photonics Research》 (光子学研究（英文版）)

年 卷 期：2016年第4卷第6期

页      面：262-266页

核心收录：

学科分类：080202[工学-机械电子工程] 08[工学] 0802[工学-机械工程] 

基　　金：National Natural Science Foundation of China(NSFC)(61505111) Guandong Natural Science Foundation(2015A030313549) Science and Technology Planning Project of Guangdong Province(2016B050501005) Science and Technology Project of Shenzhen(JCYJ20140828163633996,JCYJ20150324141711667) Natural Science Foundation of SZU(201452,201517,827-000051,827-000052,827-000059) 

主　　题：RIU Ultrasensitive biosensors based on long-range surface plasmon polariton and dielectric waveguide modes 

摘      要：An ultrasensitive biosensor based on hybrid structure and composed of long-range surface plasmon polariton(LRSPP) and dielectric planar waveguide(PWG) modes is proposed. Both PWG and LRSPP modes have strong resonances to form strong coupling between the two modes, and the two modes can couple to enhance sensitivity of sensors. In the hybrid structure, PWG is composed of cytop–Si–cytop multilayers and the LRSPP configuration is composed of cytop–metal–sensing medium multilayer slabs. The highest imaging sensitivities of 2264 and3619 RIU-1were realized in the proposed sensors based on Au and Al-monolayer graphene, respectively, which are nearly 1.2 and 1.9 times larger than the 1910 RIU-1sensitivity of the conventional LRSPR sensor(LRSPP sensor). Moreover, it is demonstrated that the PWG-coupled LRSPP biosensor is applicable to the sensing medium,with refractive index in the vicinity of 1.34.