一种基于表面等离激元的纳米温度传感器

An Optical Temperature Sensor Based on Surface Plasmon Polariton Resonator

本文基于表面等离激元(Surface Plasmon Polariton,缩写为SPP)共振腔提出了一种新型纳米温度传感器。随着温度的升高,金属的折射率会发生微小的变化,而且,共振腔的整体结构也会发生热膨胀,这都是共振腔共振波长随温度变化的因素。同时,为了放大温度对共振波长的影响,引入了一个热膨胀系数不同的金属双层膜,随着双层膜的形变,共振腔的共振波长随之发生更明显的变化。这种共振波长移动的大小可用于测量温度的变化。此外,本文采用有限元法(Finite Element Method,简称FEM)来计算共振腔的光学特性。据了解,这是第一个基于SPP共振腔热膨胀的纳米光学温度传感器,而且与同等尺度的传感器相比,其拥有较大的灵敏度。

This paper presents a novel optical temperature sensor based on a nanoscale surface plasmon polariton (SPP) resonator. With the increase of temperature, the refractive index of the metal will have small changes, and thermal expansion will occur throughout the structure of the resonant resonator, these are the factors that result in the shift of the resonators’ resonance wavelength with the temperature changing. At the same time, in order to enlarge the temperature's influence on the resonant wavelength, a metal bilayer with different thermal expansion coefficient is introduced, with the deformation of the bilayer, the resonator’s resonance wavelength then will change more obviously. The size ofresonance wavelength can be used to measure the changes of temperature. In addition, The Finite Element Method (FiniteElement Method, FEM for short) is applied to calculate the optical properties of the resonator. As is known to all, itis the first nanoscale optical temperature sensor based on the thermal expansion of the SPP resonators, and compared with the same scale of sensor, it has greater sensitivity.