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Electric Field-Induced Enhancement and Inhibition of Excitonic Spontaneous Emission in GaAs Quantum Wells Embedded in Quantum Micro-Cavities,

N. Ochi, Y. Honda, M. Yamanishi, T. Shiotani, Ikuo Suemune

Published May 22, 1992• 1 citation
OpenAlex

Abstract

Abstract : Spontaneous emission of an atom is not an immutable property of an atom but can be controlled by modification of the vacuum field fluctuations surrounding the atom. In fact, inhibition and enhancement of spontaneous emission of atoms both at microwave and optical frequencies have been demonstrated experimentally. It has, also, been demonstrated that spontaneous emission from GaAs quantum wells (QWs) is altered by embedding the QWs between AlAs/AlGaAs distributed Bragg reflectors (DBRs). Such an artificial modification of the spontaneous emission in semiconductor micro-structures is very important, particularly from device use point of view. We may, also expect enhancement and inhibition of spontaneous emission induced by tuning of emission wavelength of atoms or active materials embedded in fixed micro-cavities, instead of variation of micro-cavity structures. In this paper, we demonstrate, for the first time, controllable enhancement and inhibition of excitonic spontaneous emission by dc electric fields applied to a GaAs QW embedded in a pair of AlAs/AlGaAs DBRs.

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One of most important conclusions in cavity-quantum-electrodynamics is that spontaneous emission of an atom can be controlled by squeezing zero-point fluctuations of the photon fields surrounding the atom in both spatial and frequency domains1). As for quantum optoelectronic device application, in addition to quantum control of photon system, it is of great important to dynamically control electron system as well in order to alter spontaneous emissions. This can be easily realized in semiconductor systems by a combined use of distributed Bragg reflectors (DBRs) and the quantum confined Stark effect (QCSE) for control of photon and electron systems, respectively. The main purpose of this talk is to demonstrate our experimental results on physical phenomena originating from quantum control of electron-and photon-systems2)3), and its implications for device-applications4) involving the possibility of a novel scheme for the generation of photon-number squeezed state5).

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Control of spontaneously emitted light lies at the heart of quantum optics. It is essential for diverse applications ranging from lasers, light-emitting diodes, solar cells, and quantum information. According to the quantum electrodynamics theory, the spontaneous emission (SE) of an atom can be a weak-coupling radiation process due to the vacuum fluctuations of electromagnetic field. A suitable modification of inhomogeneous environment is required so that the vacuum fluctuations controlling the SE can be manipulated. Inhibiting unwanted SE and boosting desired ones will promote the novel optoelectronic designs tailored to industrial standard. The local density of states (LDOS) counts the number of electromagnetic modes where photons can be emitted at the specific location of the emitter, and can be interpreted as the density of vacuum fluctuations. The inhibition or enhancement of SE boils down to how the LDOS of photons is controlled. In this work, the SE of the excited atoms in 2D arbitrary inhomogeneous environment has been systematically studied. The LDOS determines the radiation dynamics of a point source (for 3D) or a line source (for 2D). In particular, it also determines the SE rate, and the LDOS is represented by the electric dyadic Green’s function. The numerical solution of the electric Green’s tensor has been accurately obtained by the finite-difference frequency-domain method with the proper approximations of the monopole and dipole sources. The SE of the atoms in the photonic crystal and plasmonic metal plates has been comprehensively and comparatively investigated. For both systems, the SE strongly depends on their respective dispersion relations and could be modified or tuned by the finite-structure or finite-size effects. This work is important for the SE engineering and optimized design of optoelectronic devices.

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Cavity quantum electrodynamics

Partha Ghose

Introduction Ever since 1916/17 when Einstein argued [45] [46] that spontaneous emission must occur if matter and radiation are to achieve thermal equilibrium, physicists have believed that spontaneous emission is an inherent quantum mechanical property of atoms and that excited atoms inevitably radiate. This view, however, overlooks the fact that spontaneous emission is a consequence of the coupling of quantized energy states of atoms with the quantized radiation field, and is a manifestation of quantum noise or of emission ‘stimulated’ by ‘vacuum fluctuations’. An infinity of vacuum states is available to the photon radiated by an excited atom placed in free space, leading to the effective irreversibility of such emissions. If these vacuum states are modified, as for example by placing an excited atom between closely spaced mirrors or in a small cavity (essentially the Casimir effect), spontaneous emission can be greatly inhibited or enhanced or even made reversible. Recent advances in atomic and optical techniques have made it possible to control and manipulate spontaneous emission. A whole new branch of quantum optics called ‘cavity QED’ has developed since 1987 utilizing these dramatic changes in spontaneous emission rates in cavities to construct new kinds of microscopic masers or micromasers that operate with a single atom and a few photons or with photons emitted in pairs in a two-photon transition.

Cambridge University Press eBooks•Apr 29, 1999•0 citations
Abstract : Spontaneous emission of an atom is not an immutable property of an atom but can be controlled by modification of the vacuum field fluctuations surrounding the atom. In fact, inhibition and enhancement of spontaneous emission of atoms both at microwave and optical frequencies have been demonstrated experimentally. It has, also, been demonstrated that spontaneous emission from GaAs quantum wells (QWs) is altered by embedding the QWs between AlAs/AlGaAs distributed Bragg reflectors (DBRs). Such an artificial modification of the spontaneous emission in semiconductor micro-structures is very important, particularly from device use point of view. We may, also expect enhancement and inhibition of spontaneous emission induced by tuning of emission wavelength of atoms or active materials embedded in fixed micro-cavities, instead of variation of micro-cavity structures. In this paper, we demonstrate, for the first time, controllable enhancement and inhibition of excitonic spontaneous emission by dc electric fields applied to a GaAs QW embedded in a pair of AlAs/AlGaAs DBRs.
One of most important conclusions in cavity-quantum-electrodynamics is that spontaneous emission of an atom can be controlled by squeezing zero-point fluctuations of the photon fields surrounding the atom in both spatial and frequency domains1). As for quantum optoelectronic device application, in addition to quantum control of photon system, it is of great important to dynamically control electron system as well in order to alter spontaneous emissions. This can be easily realized in semiconductor systems by a combined use of distributed Bragg reflectors (DBRs) and the quantum confined Stark effect (QCSE) for control of photon and electron systems, respectively. The main purpose of this talk is to demonstrate our experimental results on physical phenomena originating from quantum control of electron-and photon-systems2)3), and its implications for device-applications4) involving the possibility of a novel scheme for the generation of photon-number squeezed state5).
One of most attractive discoveries in cavity-quantum-electrodynamics in a past decade is that spontaneous emission of an atom can be controlled by squeezing zero-point fluctuations of the photon fields surrounding the atom in both spatial and frequency domains1). Considering quantum optoelectronic device-applications, in addition to control of photon system, it is of great important to control electron system as well in order to alter spontaneous emissions. This can be easily realized, by up-date technologies, in semiconductor systems by use of distributed Bragg reflectors (DBRs) and the quantum confined Stark effect (QCSE) for control of photon and electron systems, respectively. The main purpose of this paper is to review our experimental results on physical phenomena originating from control of quantum electron- and photon-systems2), and its possible device-applications
Control of spontaneously emitted light lies at the heart of quantum optics. It is essential for diverse applications ranging from lasers, light-emitting diodes, solar cells, and quantum information. According to the quantum electrodynamics theory, the spontaneous emission (SE) of an atom can be a weak-coupling radiation process due to the vacuum fluctuations of electromagnetic field. A suitable modification of inhomogeneous environment is required so that the vacuum fluctuations controlling the SE can be manipulated. Inhibiting unwanted SE and boosting desired ones will promote the novel optoelectronic designs tailored to industrial standard. The local density of states (LDOS) counts the number of electromagnetic modes where photons can be emitted at the specific location of the emitter, and can be interpreted as the density of vacuum fluctuations. The inhibition or enhancement of SE boils down to how the LDOS of photons is controlled. In this work, the SE of the excited atoms in 2D arbitrary inhomogeneous environment has been systematically studied. The LDOS determines the radiation dynamics of a point source (for 3D) or a line source (for 2D). In particular, it also determines the SE rate, and the LDOS is represented by the electric dyadic Green’s function. The numerical solution of the electric Green’s tensor has been accurately obtained by the finite-difference frequency-domain method with the proper approximations of the monopole and dipole sources. The SE of the atoms in the photonic crystal and plasmonic metal plates has been comprehensively and comparatively investigated. For both systems, the SE strongly depends on their respective dispersion relations and could be modified or tuned by the finite-structure or finite-size effects. This work is important for the SE engineering and optimized design of optoelectronic devices.
Abstract Inhibition and enhancement of spontaneous emission rate, first proposed by Purcell, is discussed in terms of altered density-of-modes in various types of solid-state cavities and the Purcell factor is derived for two-level atomic system. The conditions for observing Purcell factor and experimental findings in micropillars embedded with Quantum Dots (QD)s are discussed. The strong interaction between photons and matter in the form of QD excitons, dispersion relations for ground and excited states separated by Rabi splitting are discussed. Experimental photoluminescence spectra showing anticrossing of exciton lines and cavity lines by temperature and other tuning methods are used to illustrate the strong light-matter interaction. The Jayness–Cummins model based on second quantization is presented to point out Rabi oscillation, Purcell effect, and other novel features. Microcavity structures for observing cavity quantum electrodynamics effects are mentioned. Microcavity lasers predicting thresholdless operation for unity spontaneous emission coupling factors are discussed.
Introduction Ever since 1916/17 when Einstein argued [45] [46] that spontaneous emission must occur if matter and radiation are to achieve thermal equilibrium, physicists have believed that spontaneous emission is an inherent quantum mechanical property of atoms and that excited atoms inevitably radiate. This view, however, overlooks the fact that spontaneous emission is a consequence of the coupling of quantized energy states of atoms with the quantized radiation field, and is a manifestation of quantum noise or of emission ‘stimulated’ by ‘vacuum fluctuations’. An infinity of vacuum states is available to the photon radiated by an excited atom placed in free space, leading to the effective irreversibility of such emissions. If these vacuum states are modified, as for example by placing an excited atom between closely spaced mirrors or in a small cavity (essentially the Casimir effect), spontaneous emission can be greatly inhibited or enhanced or even made reversible. Recent advances in atomic and optical techniques have made it possible to control and manipulate spontaneous emission. A whole new branch of quantum optics called ‘cavity QED’ has developed since 1987 utilizing these dramatic changes in spontaneous emission rates in cavities to construct new kinds of microscopic masers or micromasers that operate with a single atom and a few photons or with photons emitted in pairs in a two-photon transition.