周期条状结构中长程表面等离子激元噪声特性分析(英文)

Characteristic Analysis of Noise Factor in the Periodic Stripe Long Range Surface Plasmon Polaritons Structure

基于表面等离子激元自发辐射放大噪声系数理论,研究了长程表面等离子激元噪声系数变化规律,设计了嵌有金属条的长程表面等离子结构.数值模拟得到表面等离子及周期条状长程表面等离子的噪声系数变化规律.给出入射波长从0.5μm到1.75μm,每隔0.25μm的噪声特性,发现随着波长的增加噪声系数趋近于常数.仿真结果表明:表面等离子及长程表面等离子自发辐射放大的噪声系数随着增益介质增大而明显增强;周期条状长程表面等离子结构中,随着金属膜厚度以及金属条高度及个数增加导致噪声系数增加,其中金属膜厚度对于其作用较明显.

Through the noise factor theory of amplified spontaneous emission of Surface Plasmon Polaritons （SPPs）, the variations of noise factor of Long Range Surface Plasmon Polaritons（LRSPPs） were studied. And a waveguide structure with strips embedded in the metal film of LRSPPs structure is designed. Numerical simulation is used to get the noise factor variations of SPPs and LRSPPs. In the numerical simulation,incident wavelength ranges from 0.5 /xm to 1.75 /~m, and check the characteristics of noise factors for every 0.25 /~m, the results show that the noise factors approach to a constant value with the increase of wavelength. The simulation results show that the noise factor of the amplified spontaneous emission of the SPPs and the LRSPPs are enhanced apparently with the increase of grain mediums ~ noise factors of periodic stripe LRSPPs are increased as the thicknesses of metal film and the height and the number metal strip are increased, where the impact of the thickness of metal film is relatively evident.