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金属纳米颗粒具有优异的局域增强效应,通过合理设计阵列结构,使得阵列结构的布洛赫波与单个粒子局域等离子共振(LSPR)耦合,形成阵列结构的表面晶格等离子共振(SLR),能够获得较小的模式体积、较大的品质因数和较高的自发辐射效率。菱形结构的纳米粒子能够有效的集聚电荷,形成较强的偶极子共振,具有优异的激光发射特性、较低的激光阈值和较高的空间一致性。
The metal nanoparticle has excellent local enhancement effect. The surface lattice plasmon resonance (SLR) of the array structure is formed by reasonably designing the array structure so that the Bloch waves of the array structure are coupled with the LSPR of the single particle structure. A smaller mode volume, a larger figure of merit and a higher spontaneous emission efficiency can be obtained. The diamond-shaped nanoparticles can effectively accumulate charges, form strong dipole resonance, have excellent laser emission characteristics, lower laser threshold and higher spatial consistency.