摘要
研究了一种平面波导激励的对称型表面等离子体共振(SPR)结构,该结构以一定厚度的介质两侧覆盖金属层为核心。理论分析表明,该结构的TM0模式为表面波。研究了一定波长下不同介质时金属膜间介质厚度与等效折射率之间的关系。采用离子交换技术制备了多模平面波导,对其等效折射率进行了测试,采用平面波导激励对称结构的等离子体表面波(SPW)。分别采用300nm和500nm的介质厚度,对0～70%的甘油溶液进行测试,可激发SPW,说明该结构的折射率匹配可以通过调节两金属薄膜之间的介质厚度来实现,解决了离子交换平面波导导膜等效折射率一般较大,很难与被测介质的折射率匹配激发SPW,进而实现传感的问题。
A symmetric structure of surface plasmon resonance excited by planar waveguide is studied. The structure is the metal layer covering both sides of the media with a certain thickness. The theoretical analysis shows that the TM0 mode of that structure is surface wave and the relationship between the equivalent refractive index and the interval of metal films is studied under a certain wavelength. Ion-exchange technology is used to prepare the multi-mode planar waveguide. The planar waveguide is used to excite the plasmon surface wave of the symmetric structure and its equivalent refractive index is tested. Plasma surface wave is excited when the concentration of glycerin solution is 0--70 ~ and the thickness is 300 nm and 500 nm respectively. Results show that the refractive index matching of this structure can be adjusted by changing the thickness of media. The problem that the equivalent refractive index of ionexchange planar waveguide is large and it is difficult to excite the plasmon surface wave between the metal and the media to achieve sensing is solved.
出处
《光电子．激光》
EI
CAS
CSCD
北大核心
2011年第12期1821-1825,共5页
Journal of Optoelectronics·Laser
基金
国家自然科学基金资助项目(60677032,61077042)
上海市重点学科建设资助项目(S30502)
上海市重点实验室建设资助项目(08DZ2272800)
上海市科委资助项目(10160501700)
上海工程技术大学校教学建设资助项目(p201102003,k201102003)
