Kewes Günter, Herrmann Kathrin, Rodríguez-Oliveros Rogelio, Kuhlicke Alexander, Benson Oliver, Busch Kurt
AG Nanooptik, Institut für Physik, Humboldt-Universität zu Berlin, Newtonstrasse 15, 12489 Berlin, Germany.
AG Theoretische Optik & Photonik, Institut für Physik, Humboldt-Universität zu Berlin, Newtonstrasse 15, 12489 Berlin, Germany.
Phys Rev Lett. 2017 Jun 9;118(23):237402. doi: 10.1103/PhysRevLett.118.237402.
We present a semiclassical analytic model for spherical core-shell surface plasmon lasers. Within this model, we drop the widely used one-mode approximations in favor of fully electromagnetic Mie theory. This allows for incorporation of realistic gain relaxation rates that so far are massively underestimated. Especially, higher order modes can undermine and even reverse the beneficial effects of the strong Purcell effect in such systems. Our model gives a clear view on gain and resonator requirements, as well as on the output characteristics that will help experimenters to design more efficient particle-based spasers.
我们提出了一种用于球形核壳表面等离子体激光器的半经典解析模型。在该模型中，我们摒弃了广泛使用的单模近似，转而采用全电磁米氏理论。这使得能够纳入目前被严重低估的实际增益弛豫率。特别是，高阶模会破坏甚至逆转此类系统中强珀塞尔效应的有益效果。我们的模型清晰地展示了增益和谐振器要求，以及输出特性，这将有助于实验人员设计更高效的基于粒子的受激辐射放大源。
