应用米氏理论,对银膜包覆PMMA纳米核壳结构的局域表面等离激元共振行为进行了模拟计算,研究了颗粒尺寸、核壳比等参数对纳米核壳结构局域表面等离激元共振消光光谱的影响;同时将其与实心银纳米球的局域表面等离激元共振光谱行为进行了比较。结果表明,相对于实心银纳米球,银膜包覆PMMA纳米核壳结构的共振峰位更加红移,且共振峰的宽度更窄。这些性能上的提高,是由于纳米PMMA介质核的存在减弱了电子云振荡过程中的滞后效应,利于化学生物传感器方面的应用。 The Mie theory was used to simulate the local surface plasmon resonance behavior of silver-coated PMMA nanoshells. The effects of particle size, core-shell ratio and other parameters on the local surface plasmon resonance Exciton resonance extinction spectroscopy; at the same time, it was compared with the local surface plasmon resonance spectra of solid silver nanospheres. The results show that the resonance peak position of silver shell-coated PMMA nanoshells is more red-shifted and the width of the formant is narrower than that of solid silver nanospheres. These improvements in performance are due to the fact that the presence of the nano-PMMA dielectric weakens the hysteresis effect during the oscillation of the electron cloud and is beneficial to the application of chemical biosensors.