Quadratic Electro-Optic Effect and Electro Absorption Process of Multi-layer Spherical Quantum Dot Enhanced by Metal Nanoparticle

Abstract

In this work, the quadratic electro-optic effects (QEOE) and electro-absorption (EA) process of hybrid structure consisting of metal nanoparticle (MNP) coupled to multi-layer spherical quantum dot (MSQD) are investigated numerically. The energy levels and corresponding wave functions of Schrödinger equation in the effective mass approximation are obtained using the fourth-order RungeKutta method. The effect of MNP in the vicinity of MSQD is calculated by considering local field enhancement. Then, the variation of QEOE and EA process of hybrid system is reported. The results show that the presence of MNP near MSQD enhances the optical nonlinearity. Also, by changing the parameters such as distance between MNP and MSQD, and radius of MNP, the variations of optical nonlinearity are studied.

Electronic Localized States Behaviour in a GaAs/GaAlAs Multi-Quantum Wells with a Geo-Material and a Material Defects

“…However, even if there is a link between photonic and electronic structures in terms of similarity of behavior, it still exists a significant difference between photons in an optical cavity [3] and the behavior of electronic waves in the band of a solid [4]. Semiconductors are used as basic structure in various devices such avalanche photodiodes [5], diode lasers [6], quantum cascade lasers [7], photovoltaics, solar energy harvesting [8], inter-sub-band detectors [9], unipolar avalanche photodiodes [10], and modulators [11]. These are just a few examples of the optoelectronic devices that have been made possible by studying the fundamental physical properties of quantum confinement.…”

Highly entangled photon pairs generated from the biexciton cascade transition in a quantum-dot–metal-nanoparticle hybrid system

“…Although the confined plasmonic modes couple very strongly with matter for large ohmic losses, unfortunately, it is not easy to enter the strongcoupling regime in plasmonic systems [49]. Various quantum optical features of MNP coupling to a variety of QD configurations have been extensively investigated within different approaches for both the weak and strong coupling regimes [47][48][49][50][51][52][53][54][55] In this paper, we study the manipulation of entanglement of the photon pairs emitted from the biexciton cascade coupled to the surface plasmon modes via the changing geometry and other relevant physical parameters of the hybrid system under consideration. In general, there are two fundamental sources of noise, i.e., thermal and quantum noises.…”