A Comparative Study of Coherent and Incoherent Drives in Four-Level Quantum Dot-Based Spaser
arXiv:2309.04451 · doi:10.1088/2040-8986/ad21dc
Abstract
In this article, we theoretically investigate a spaser (surface plasmon amplification by stimulated emission of radiation), which consists of a spherical silver nanoparticle surrounded by four-level gain medium of quantum dots (QDs). The spaser system is pumped coherently and incoherently with the same excitation rate, and the characteristics of coherent localized surface plasmon (LSP) mode, thus produced, are compared for the two pumping scenarios. We provide a detailed analytical expression for the steady state and show that the incoherent pump is more suitable for the continuous spaser mode. The reason is better understood by studying the temporal evolution of number of LSP (N_n ), where the oscillation of LSP starts early for incoherent drive and relaxes to steady state with a large value of N_n. At a large pump rate, spaser curve shows saturation. In addition, we have found that the resonance peak of spaser field is independent of coherent as well as incoherent pumping, while the peak amplitude of field depends on the pump rate.
arXiv comment12 pages, 6 figures
References in corpus (7)
- Spaser as Nanoscale Quantum Generator and Ultrafast Amplifier
- Quantum-Coherence-Enhanced Surface Plasmon Amplification by Stimulated Emission of Radiation
- Limitations of Particle-Based Spasers
- Rabi oscillations in spasers during the nonradiative plasmon excitation
- A Single-Emitter Gain Medium for Bright Coherent Radiation from a Plasmonic Nanoresonator
- Approach for describing spatial dynamics of quantum light-matter interaction in dispersive dissipative media
- Gain-compensated cavities for the dynamic control of light-matter interactions