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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 planar waveguide-excited symmetric surface plasmon resonance (SPR) structure is studied. The structure is centered on a metal layer covered on both sides of a certain thickness of the medium. Theoretical analysis shows that TMO mode of this structure is surface wave. The relationship between the thickness of the metal film and the equivalent refractive index of different media under certain wavelength is studied. A multi-mode planar waveguide was fabricated by ion exchange technique. Its equivalent refractive index was tested. The planar waveguide was used to excite the symmetrical structure of the plasma surface wave (SPW). Respectively using 300nm and 500nm media thickness, testing 0 to 70% glycerol solution can stimulate SPW, indicating that the refractive index matching of the structure can be achieved by adjusting the thickness of the medium between the two metal films to solve the ion exchange plane Waveguide guide film equivalent refractive index is generally larger, it is difficult to match the refractive index of the measured medium excitation SPW, and then realize the sensor problem.