Search query: Coupling of quantum dots and cavities

Related papers:

abstract: We investigate the effect of decoherence mechanisms in semiconductor quantum dot cavity systems by performing photoluminescence measurements of InGaAs/GaAs site controlled quantum dots coupled to photonic crystal cavities and comparing the results to a theoretical model.
author_names: C Jarlov

Etienne Wodey

A Lyasota

Milan Calic

Pascal Gallo

Benjamin Dwir

Alok P Rudra

E Kapon
title: Effect of pure dephasing and phonon scattering on the coupling of semiconductor quantum dots to optical cavities
venue: 2015 Conference on Lasers and Electro Optics (CLEO)
year: 2015

abstract: Quantum electrodynamics is rapidly finding a set of new applications in thresholdless lasing, photochemistry, and quantum entanglement due to the development of sophisticated patterning techniques to couple nanoscale photonic emitters with photonic and plasmonic cavities. Colloidal and epitaxial semiconductor nanocrystals or quantum dots (QDs) are promising candidates for emitters within these architectures but are dramatically less explored in this role than are molecular emitters. This perspective reviews the basic physics of emitter cavity coupling in the weak to strong coupling regimes, describes common architectures for these systems, and lists possible applications (in particular, photochemistry) with a focus on the advantages and issues associated with using QDs as the emitters.
author_names: Dana E Westmoreland

Kevin P McClelland

Kaitlyn A Perez

James C Schwabacher

Zhengyi Zhang

Emily A Weiss
title: Properties of quantum dots coupled to plasmons and optical cavities.
venue: The Journal of chemical physics
year: 2019

abstract: Strong coupling originating from excitons of quantum dots and plasmons in nanocavities can be realized at room temperature due to the large electromagnetic field enhancement of plasmons, offering building blocks for quantum information systems, ultralow power switches and lasers. However, most of the current strong coupling effects were realized by the interaction between excitons and far field light excited bright plasmon modes in the visible range. Beyond that, there is still a lack of direct imaging of polariton modes at the nanoscale. In this work, by using cathodoluminescence, ultrastrong coupling with Rabi splitting exceeding 1 eV between bonding breathing plasmons of aluminum (Al) metal insulator metal (MIM) cavities and excited states of CdZnS/ZnS quantum dots was observed in the near ultraviolet (UV) spectrum. Further, the hybridization of the QDs excitons and bonding breathing plasmonic modes is verified by deep subwavelength images of polaritonic modes in real space. Analytic analysis based on the coupled oscillator model and full wave electromagnetic simulations is consistent with our experimental results. Our work not only indicates the great potential of electron excited plasmon modes for strong coupling applications, but also extends the polaritonic frequency to the UV range with Al nanocavities.
author_names: Liangwan Li

Lei Wang

Chenglin Du

Zhongyuan Guan

Yinxiao Xiang

Wei Wu

Mengxin Ren

Xinzheng Zhang

Aiwei Tang

Wei Cai

Jingjun Xu
title: Ultrastrong coupling of CdZnS/ZnS quantum dots to bonding breathing plasmons of aluminum metal insulator metal nanocavities in near ultraviolet spectrum.
venue: Nanoscale
year: 2020

abstract: Confining light in extremely small cavities is crucial in nanophotonics, central to many applications. Employing a unique nanoparticle on mirror plasmonic structure and using graphene film as spacer, we create nanoscale cavities with volumes of only a few tens of cubic nanometers. The ultracompact cavity produces extremely strong optical near fields, which facilitate the formation of single carbon quantum dot in the cavity and simultaneously empowers the strong coupling between the excitons of the formed carbon quantum dot and the localized surface plasmons. This is manifested in the optical scattering spectra, showing magnificent Rabi splitting up to 200 meV at ambient conditions. In addition, we demonstrate that the strong coupling is tuneable with light irradiation. This opens new paradigms of investigating the fundamental light emission properties of carbon quantum dots in the quantum regime and paves the way for many significant applications.
author_names: Joel M Katzen

Christos Tserkezis

Qiran Cai

Luhua Li

Gaehang Lee

Gi-Ra Yi

W R Hendren

Elton J G Santos

Robert M Bowman

Fumin Huang
title: Strong coupling of carbon quantum dots in plasmonic nanocavities.
venue: ACS applied materials interfaces
year: 2020

author_names: T Tian Xia
title: Controlled coupling of semiconductor quantum dots to optical micro cavities
year: 2015

abstract: We report a study of single quantum dots inside photonic crystal cavities with a low temperature scanning near field optical microscope. The spatial maps of single excitonic lines from the quantum dot show the clear signature of coupling to the cavity modes for small detunings. We also show that the near field tip can be used to control the exciton photon coupling at the nanoscale. A general framework for the interpretation of near field maps of single emitters in cavities is proposed.
author_names: Matthias Skacel

Francesco Pagliano

Thang Ba Hoang

Leonardo Midolo

Sartoon Fattahpoor

Lianhe Li

Edmund H Linfield

Andrea Fiore
title: Coupling of single quantum dots to photonic crystal cavities investigated by low temperature scanning near field optical microscopy
year: 2013

abstract: Solid state single photon sources with high purity, high brightness and a large degree of linear polarization are appealing to photonic quantum technologies. However, high performance single photon sources based on InAs/GaAs quantum dots (QDs) so far are operating at near infrared range, which limits the detection efficiency and potential compatibility with atomic quantum memory in visible. Here, we explore GaAs droplet epitaxial QDs emitting in visible to achieve bright, pure and highly polarized single photon emission via coupling to photonic crystal cavities.
author_names: Yuming Wei

Tianming Zhao

Beimeng Yao

Rongbin Su

Ying Yu

Jin Liu

Xuehua Wang
title: Bright and highly polarized single photon sources in visible based on droplet epitaxial GaAs quantum dots in photonic crystal cavities
year: 2019

abstract: We present rigorous and intuitive master equation models to study on demand single photon sources from pulse excited quantum dots coupled to cavities. We consider three methods of source excitation: resonant pi pulse, off resonant phonon assisted inversion, and two photon excitation of a biexciton exciton cascade, and investigate the effect of the pulse excitation process on the quantum indistinguishability, efficiency, and purity of emitted photons. By explicitly modelling the time dependent pulsed excitation process in a manner which captures non Markovian effects associated with coupling to photon and phonon reservoirs, we find that photons of near unity indistinguishability can be emitted with over 90% efficiency for all these schemes, with the off resonant schemes not necessarily requiring polarization filtering due to the frequency separation of the excitation pulse, and allowing for very high single photon purities. Furthermore, the off resonant methods are shown to be robust over certain parameter regimes, with less stringent requirements on the excitation pulse duration in particular. We also derive a semi analytical simplification of our master equation for the off resonant drive, which gives insight into the important role that exciton phonon decoupling for a strong drive plays in the off resonant phonon assisted inversion process
author_names: Chris Gustin

Stephen H Hughes
title: Efficient Pulse Excitation Techniques for Single Photon Sources from Quantum Dots in Optical Cavities
venue: Advanced Quantum Technologies
year: 2019

abstract: The control of quantum coupling between nano objects is essential to quantum technologies. Confined nanostructures, such as cavities, resonators, or quantum dots, are designed to enhance interactions between electrons, photons, or phonons, giving rise to new properties, on which devices are developed. The nature and strength of these interactions are often measured indirectly on an assembly of dissimilar objects. Here, we adopt an innovative point of view by directly mapping the coupling of single nanostructures using scanning tunneling microscopy and spectroscopy (STM and STS) We take advantage of the unique capabilities of STM/STS to map simultaneously the nano object's morphology and electronic density in order to observe in real space the electronic coupling of pairs of In(Ga)As/GaAs self assembled quantum dots (QDs) forming quantum dot molecules (QDMs) Differential conductance maps d I/d V E, x, y) demonstrate the presence of an effective electronic coupling, leading to bonding and antibonding states, even for dissymmetric QDMs. The experimental results are supported by numerical simulations. The actual geometry of the QDMs is taken into account to determine the strength of the coupling, showing the crucial role of quantum dot size and pair separation for device growth optimization.
author_names: Guillemin Rodary

Lorenzo Bernardi

Christophe David

Bruno Fain

Aristide Lemaitre

Jean Christophe Girard
title: Real Space Observation of Electronic Coupling between Self Assembled Quantum Dots.
venue: Nano letters
year: 2019

abstract: In this paper, the properties of emission spectra of dissipative cavities coupled with quantum dots were studied. The effects of the cavity incoherent pump rate on the emission spectra of the system are discussed. We found that the incoherent pump rate can enhance the fluorescence emission in dissipative cavities coupled with quantum dots and the result can be confirmed in experiment. In addition, the effects of the coupling strengths between quantum dot and cavity field, and between the two cavities on the emission spectra of the system also are discussed. Our results show that in the case of no matter resonance or off resonance, the triple peaks should occur in theory when the single mode cavity coupled with a double level system is affected by external coherent fields and we also demonstrate that the Rabi splitting increases with the coupling strengths between quantum dot and cavity field or between the two cavities increase.
author_names: Yang Zhang

Shu-chen Lu
title: Emission spectrum in dissipative cavities coupled with quantum dots
venue: Journal of Physics B: Atomic, Molecular and Optical Physics
year: 2019