参量变化对长程表面等离子体波特性的影响

发布时间：2018-11-13 13:00

【摘要】：为了掌握长程表面等离子体波的共振角度、共振峰半峰全宽以及衰减峰深度等重要特性,采用棱镜耦合激发介质-金属薄膜-介质对称结构中的长程表面等离子体波,研究了金属膜材料、厚度、介质折射率及介质厚度等参量变化时对长程表面等离子体波特性的影响。结果表明,实验中激发的长程表面等离子体波的衰减峰半峰全宽比传统的窄1~2个数量级;当介质膜厚度为500nm和1300nm时,激发的表面等离子体波的衰减深度只有薄膜厚度为700nm和1000nm时的1/2左右;随着介质膜厚度的增加,半峰全宽减小,金属膜越薄,衰减深度越深,衰减峰的半峰全宽值越小;介质膜折射率的改变对于半峰全宽的影响不明显;金属膜参量的变化将改变共振峰的位置。该研究为长程表面等离子体波的激发及应用于传感领域提供了有效依据,有利于其在波导和生物传感等方面的应用。
[Abstract]:In order to master the resonance angle of the long range surface plasma wave, the full width of the half peak of the resonance peak and the depth of the attenuation peak, the prism coupling is used to excite the long range surface plasma wave in the dielectric-metal thin film-medium symmetric structure. The effects of the parameters such as the thickness of metal film, the refractive index of medium and the thickness of medium on the characteristics of long range surface plasma wave were studied. The results show that the half-width of the attenuation peak of the long-range plasma wave excited in the experiment is 1 ~ 2 orders of magnitude narrower than that of the traditional one. When the thickness of the dielectric film is 500nm and 1300nm, the attenuation depth of the stimulated surface plasma wave is only about 1 / 2 of the thickness of the film when the thickness of the film is 700nm and 1000nm. With the increase of the thickness of the dielectric film, the full width of the half peak decreases, the thinner the metal film, the deeper the attenuation depth, the smaller the full width of the half peak of the attenuation peak, the less the effect of the refractive index of the dielectric film on the full width of the half peak. The change of the metal film parameters will change the position of the resonance peak. This study provides an effective basis for the excitation and application of long range surface plasma waves in the field of sensing, and is beneficial to its applications in waveguides and biosensors.
【作者单位】：上海工程技术大学电子电气工程学院;上海理工大学光电信息与计算机工程学院;
【基金】：国家自然科学基金资助项目(61302181) 上海市自然科学基金资助项目(14ZR1418400,14ZR1418500) 上海市教委科研创新基金资助项目(13YZ111)
【分类号】：O485

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