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提出了一种新的表面等离子体共振传感器,它包含三层结构:棱镜、金属薄膜及二能级介质.通过理论分析发现,与通常表面等离子体共振系统不同,这一物理系统中同时存在两种共振效应(表面等离子体共振和能级间量子跃迁的共振效应),它们共同作用的结果导致一系列新的物理现象,其中一个令人感兴趣的现象是入射光的反射率对外场导致的微小能级移动十分敏感(这一现象是通常的表面等离子体共振系统所不具有的).由于能级移动依赖于外场,所以最终入射光的反射率对外场具有灵敏的响应.本文以外磁场导致能级移动的情况进行了理论计算,结果表明,这种表面等离子体共振系统的入射光的反射率对外加磁场极其敏感.这一特性可以用来测量物质表面附近的微弱磁场,有可能发展成为一种新型检测技术.
A new surface plasmon resonance sensor is proposed, which consists of three layers: prism, metal thin film and two-level medium.It is found through theoretical analysis that, unlike the conventional surface plasmon resonance system, there are two The resonance effect (surface plasmon resonance and resonance effect of energy transition between levels), the result of their interaction leads to a series of new physical phenomena. One of the interesting phenomena is the reflectivity of incident light to the external field (This phenomenon is not typical of surface plasmon resonance systems.) Since the energy level shift depends on the external field, the reflectance of the final incident light has a sensitive response to the external field. Theoretical calculations of the energy level shift show that the reflectance of incident light of this surface plasmon resonance system is extremely sensitive to the applied magnetic field.This property can be used to measure the weak magnetic field in the vicinity of the material surface and may develop into A new detection technique.