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Study of laser interactions with quantum particles / Tan Kai Shuen

Kai Shuen Tan

Published Jan 1, 2013• 0 citations
OpenAlex

Abstract

In this research, we consider the interaction between an atomic or molecular quantum system (QS) and a metallic nanoparticle (MP). We modelled QS by a three-level lambda system. Under the probe field and control field, the QS become transparent to incident light within a narrow spectrum of frequency, a phenomena known as electro- magnetically induced transparency (EIT). The quantum coherence of the QS under EIT and the strong exciton-plasmon coupling between the QS and MP are dependant on each other. The analytical expressions for the interaction of QS and MP are derived using two methods. First, the QS-MP system is considered as a one-dimensional problem. The ex- pressions derived using this method is not general, however, they provide a simple and more intuitive understanding of the interaction. The second method employed to derive the analytical expressions is by using a vectorial description. Using this model, the exact and general expressions describing the QS-MP system are derived. The density matrix of the QS-MP system was used to obtain numerical results for the dielectric function of QS and MP. The effect of field detuning, distance between the QS and MP, laser field direction and polarization on the dielectric functions are investigated.

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In this research, we consider the interaction between an atomic or molecular quantum system (QS) and a metallic nanoparticle (MP). We modelled QS by a three-level lambda system. Under the probe field and control field, the QS become transparent to incident light within a narrow spectrum of frequency, a phenomena known as electro- magnetically induced transparency (EIT). The quantum coherence of the QS under EIT and the strong exciton-plasmon coupling between the QS and MP are dependant on each other. The analytical expressions for the interaction of QS and MP are derived using two methods. First, the QS-MP system is considered as a one-dimensional problem. The ex- pressions derived using this method is not general, however, they provide a simple and more intuitive understanding of the interaction. The second method employed to derive the analytical expressions is by using a vectorial description. Using this model, the exact and general expressions describing the QS-MP system are derived. The density matrix of the QS-MP system was used to obtain numerical results for the dielectric function of QS and MP. The effect of field detuning, distance between the QS and MP, laser field direction and polarization on the dielectric functions are investigated.
The optical polarization from a hybrid system including a closely spaced spherical SQD (modeled as a three-level V-type system) and a metal nanoparticle which are considered classically and are connected by the dipole–dipole interaction mechanism is investigated. The interaction between the SQD and the MNP shows an interesting optical response. In the weak probe field regime and MNP nonlocality correction, the absorption spectrum of the hybrid system exhibits an EIT window with two absorption peaks and the plasmon-assisted quantum interference plays an important role in the position and amplitude of these peaks, which are intensely altered by including the nonlocal effects. The probe diffraction grating is created based on the excitons-induced transparency by applying a standing-wave coupling field. The results of this study are useful in numerous areas of all-optical communications.
Quantum optics of metallic photonic crystals is studied in this paper. Crystals are made from metallic spheres and a background dielectric material. The refractive index of the metallic spheres depends on the frequencies of the incident light and plasmons whereas the refractive index of the background material is a constant. Crystals are lightly doped with four-level nanoparticles. It is considered that nanoparticles are interacting with the metallic crystals via electron-photon interaction in the dipole approximation. The probe and pump laser fields are applied to monitor the absorption spectrum in the system. Two transparent states are predicted. One is due to the electromagnetically induced transparency and the other is due to the electron-photon interaction. For certain experimental conditions these transparent states merge into one transparent state. The effect of plasmon frequencies has also been studied. It is found that the system can be switched from a transparent state to an absorbing state just by changing the frequency of plasmons. This study can be used to makes new types of optical devices such as switches and optical transistors.
The effect of a nearby metallic particle on the quantum optical properties of a quantum particle in the four-level double Raman configuration is studied using the quantum Langevin approach. We obtain analytical expressions for the correlated quantum fields of Stokes and anti-Stokes photons emitted from the system and perform analysis on how the interparticle distance, the direction of observation or detection, the strengths of controllable laser fields, the presence of surface plasmon resonance, and the number density of the quantum particle affect the quantum spectra of the Stokes and anti-Stokes fields. We explore the physics behind the quantum-particle--metallic-nanoparticle interaction within the dipole approximation, that is, when the interparticle distance is much larger than the sizes of the particles. Our results show the dependence of the spectra on the interparticle distance in the form of oscillatory behavior with damping as the interparticle distance increases. At weaker laser fields the enhancement of quantum fields which manifests itself in the form of a Fano dip in the central peak of the spectra becomes significant. Also, the quantum-particle--metallic-nanoparticle coupling, which is affected by the size of the metallic nanoparticle and the number density of the quantum particle, changes the angular dependence of the spectra by breaking the angular rotational symmetry. In the presence of surface plasmon resonance the oscillatory dependence of the spectra on the interparticle distance and angles of observation becomes even stronger due to the plasmonic enhancement effect.
Abstract We theoretically study the polarization of plasmonic fields in a hybrid nanosystem composed of three different metallic nano ellipsoid and a semiconductor quantum dot. The components of the hybrid nanosystem interact with three electromagnetic fields and one another via dipole-dipole interactions. We derive the density matrix equations at a steady state for the description of the optical properties of the hybrid nanosystem. The polarization of the plasmonic fields induced on the prolate, spherical, and oblate nano ellipsoid is calculated. We find that the polarization of the plasmonic fields depends on the number of the metallic nanoparticles (ellipsoid), the depolarization factor of the metallic nano ellipsoid, the direction of the plasmonic field, and the metallic nano ellipsoid parameters of the hybrid nanosystem. The phenomena of electromagnetically induced transparency (EIT) and electromagnetically induced transparency with amplification (EITA) are obtained in this work.
We numerically investigate the electromagnetically induced transparency (EIT) of a hybrid system consisting of a three-level quantum dot (QD) in the vicinity of vanadium dioxide nanoparticle (VO2NP). VO2NP has semiconductor and metallic phases where the transition between the two phases occurs around a critical temperature. When the QD-VO2NP hybrid system interacts with continuous wave laser fields in an infrared regime, it supports a coherent coupling of exciton–polariton and exciton–plasmon polariton in semiconductor and metal phases of VO2NP, respectively. In our calculations a filling fraction factor controls the VO2NP phase transition. A probe and control laser field configuration is studied for the hybrid system to measure the absorption of QD through the filling fraction factor manipulations. We show that for the VO2NP semiconductor phase and proper geometrical configuration, the absorption spectrum profile of the QD represents an EIT with two peaks and a clear minimum. These two peaks merge to one through the VO2NP phase transition to metal. We also show that the absorption spectrum profile is modified by different orientations of the laser fields with the axis of the QD-VO2NP hybrid system. The innovation in comparison to other research in the field is that robust variation in the absorption profile through EIT is due to the phase transition in VO2NP without any structural change in the QD-VO2NP hybrid system. Our results can be employed to design nanothermal sensors, optical nanoswitches, and energy transfer devices.
A quantum particle strongly interacting with a nearby metallic particle is a fundamental system in nanoplasmonics. The dielectric function of the quantum system can manifest rich quantum nonlinear optics phenomena when the spatial dependence of the vectorial nature of the probing laser field and the dipole moment are considered. We find that the quantum system can exhibit giant gain and giant absorption when the dipole moment orientation and the direction, polarization, and relative phase of the probe field components are properly tuned, especially in the near-field regime. This can be explained as due to the strong interactions between the quantum system and the metallic particle in the near-field regime at surface plasmon resonance. Interestingly, these giant features can be suppressed by a large probe Rabi frequency. The study enables remarkable coherent control of optical properties in quantum nanoplasmonics, useful for enhancing absorption in solar cells and light amplification for lasing and sensing.