Modeling of dielectric function in plasmonic quantum dot nanolaser

• Published in: Optical and quantum electronics 2019-12, Vol.51 (12), p.1-13, Article 396
• Main Authors: Jabir, Jamal N., Ameen, S. M. M., Al-Khursan, Amin Habbeb
• Format: Article
• Language: English
• Subjects: Characterization and Evaluation of Materials; CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Computer Communication Networks; Damping; DIELECTRIC MATERIALS; Dielectrics; DIFFUSION BARRIERS; DISPERSION RELATIONS; DISPERSIONS; Electrical Engineering; INDIUM ARSENIDES; INTERFACES; Lasers; LAYERS; METALS; Optical Devices; Optics; Photonics; Physics; Physics and Astronomy; PLASMA; PLASMONS; Polaritons; POLARONS; Propagation; QUANTUM DOTS; RESOLUTION; SENSITIVITY; Silver; SIMULATION; Wetting
• ISSN: 0306-8919; 1572-817X
• DOI: 10.1007/s11082-019-2117-0

In this work we present a model of the dielectric function in plasmonic quantum dot (QD) nanolaser. A metal/semiconductor/metal structure was considered to attain plasmonic nanocavity with active region containing: QD, wetting layer and barrier. The dielectric function was calculated for both metal (Ag) and QD structure. The propagation constant of surface plasmon polariton (SPP) at the interface of Ag/InAs-QD structure was calculated and the dispersion relation of the plasmonic QD structure was evaluated. For frequencies far from plasma one, the gap between real and imaginary parts was large and a deviation from linear relation was obvious. The SPP field was strongly localized at the interface due to the effect of zero-dimensional QD structure which has application in the super-resolution and best sensitivity in optical imaging. Results of propagation length of SPP ( L spp ) also support this. According to the L spp results, the damping in the SPP energy was low in the Ag/InAs-QD compared to that in the Ag/air interface. The obtained results are in the range of experimental ones.