Conditions for loss compensation of surface plasmon polaritons in a metal layer surrounded by an active dielectric: an analytic solution
| Autor: | Stoyan C. Russev, Gichka G. Tsutsumanova, Atanas N. Tzonev |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Active laser medium business.industry Physics::Optics 02 engineering and technology Dielectric Radiation 021001 nanoscience & nanotechnology 01 natural sciences Surface plasmon polariton Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Compensation (engineering) 010309 optics 0103 physical sciences Dissipative system Optoelectronics Electrical and Electronic Engineering 0210 nano-technology business Layer (electronics) Complex plane |
| Zdroj: | Optical and Quantum Electronics. 52 |
| ISSN: | 1572-817X 0306-8919 |
| DOI: | 10.1007/s11082-020-02434-1 |
| Popis: | The propagation length of surface plasmon polaritons (SPP) is limited by the internal losses in the metal and the radiation losses due to the structure imperfections at the interface. These losses can be compensated by introducing material with optical gain (active medium) in the system. The required gain for complete loss compensation depends not only on the dissipative properties of the metal but also on the geometry of the structure. The geometry factor can weaken the gain requirements and one promising system, in this respect, is a metal layer embedded in an active medium. Here we present an analytical solution for this system, which allows to find the curves of exact loss compensation in the complex plane of the dielectric function of the gain medium. These curves determine the minimum required gain of the active medium for lossless SPP propagation. The solution is given for both modes of SPP propagation. This approach is then illustrated and discussed for silver and gold layers embedded in an active media. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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