Bound state and non-Markovian dynamics of a quantum emitter around a surface plasmonic nanostructure

Wen, Sha-Sha; Huang, Yanyan; Wang, Xiaoyun; Liu, Jie; Li, Yun; Xiu-E, Quan; Yang, Hong; Peng, Jinzhang; Deng, Ke; Zhao, Heping

doi:10.1364/oe.386828

Cited by 19 publications

(16 citation statements)

References 102 publications

(129 reference statements)

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“…This indicates that the (ultra)strong coupling regime of the light-matter interaction between the QE and the WSe 2 layer is attained [12]. Under such coupling conditions, a bound state between the electromagnetic continuum, as modified by the presence of the WSe 2 layer, and the two-level QE is formed [13,14], which results in about 30% of the initial population remaining in the QE at times longer than 60 fs.…”

Section: Resultsmentioning

confidence: 99%

Reversible Population Dynamics at the Nanoscale for a Quantum Emitter Near a WSe2 Monolayer

Thanopulos

Karanikolas

Paspalakis

2020

The 2nd International Online-Conference on Nanomaterials

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The interaction of quantum emitters with photonic antennas created by nanoscale structures may lead to several interesting phenomena with many important potential applications in current and future technology. There are two distinct regimes of light–matter interaction between a quantum emitter and its modified photonic environment, the weak coupling regime and the strong coupling regime, where the quantum emitter has a completely different spontaneous emission response. In the weak coupling regime, an initially excited quantum emitter shows an exponential spontaneous emission dynamic (Markovian response), but the spontaneous decay rate can be markedly different from the free-space vacuum, and can be either enhanced or suppressed due to the Purcell effect. In the strong coupling regime, there is a coherent exchange of energy between the quantum emitter and its modified nanophotonic environment, which manifests itself in non-exponential spontaneous emission dynamics (non-Markovian response). We investigate the spontaneous emission dynamics of a two-level quantum emitter in proximity to an atomically thin tungsten diselenide (WSe2) layer at various distances of the emitter from the layer and various free-space decay rates of the emitter. Depending on the distance and the decay rate value, our studies cover the range of the weak to strong coupling regime of the light–matter interaction between the quantum emitter and the electromagnetic continuum modified by the WSe2 layer. We find that the decay dynamics is Markovian under weak coupling conditions, and it becomes strongly non-Markovian, characterized by oscillatory population emitter dynamics, on the top of the overall population decay, as well as population trapping in the emitter. Besides population evolution, we also discuss the non-Markovian spontaneous emission dynamics using a widely used non-Markovianity measure.

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Section: Resultsmentioning

confidence: 99%

Reversible Population Dynamics at the Nanoscale for a Quantum Emitter Near a WSe2 Monolayer

Thanopulos

Karanikolas

Paspalakis

2020

The 2nd International Online-Conference on Nanomaterials

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“…Meanwhile, quantum light-matter interactions, for example see Refs. [14][15][16][17][82][83][84][85][86][87][88][89], have been the subject of intense theoretical and practical interest. Our method can serve as a robust and valuable tool in this field, when plasmonic effects in mesoscopic metal nanostructure is exploited.…”

Section: Discussionmentioning

confidence: 99%

“…(1) and (2)] can be solved with a commercial software based on the finite-element method (FEM), COMSOL MULTIPHYSICS, which has been widely used in the plasmonic community, for example see Refs. [14,16,53,60,61,[64][65][66][67][68]. For axis symmetric structures, the 2.5D technique can be applied to reduce the computational cost [60,61,66,69].…”

Section: A Convergence and Linewidth By Conventional Quantum Hydrodyn...mentioning

confidence: 99%

“…Plasmonic nanostructure can be used to reduce the size of optical devices and enhance the light-matter interaction for their ability to localize electromagnetic field well below the diffraction limit [1][2][3][4][5][6][7][8][9][10][11][12][13]. Many novel phenomena have been reported, such as quantum emitterplasmon bound state [14,15], reversible decay dynamics [16,17], polarization dependence of fluorescence [18,19], position dependent dipole-dipole interaction [20], enhanced solar energy conversion [21,22], biomedicine [23][24][25], surface-enhanced Raman scattering [26,27], plasmon rulers with ultrahigh sensitivity [28], plasmonic photocatalysis [29], plasmonic nanoantennas [30], sensors [31], plasmon laser [32], nano-optical tweezers [33], etc.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Parameter-free quantum hydrodynamic theory for plasmonics: Electron density-dependent damping rate and diffusion coefficient

Hu¹,

Ren-feng²,

Shan³

et al. 2022

Preprint

Self Cite

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Plasmonics is a rapid growing field, which has enabled both exciting, new fundamental science and inventions of various quantum optoelectronic devices. An accurate and efficient method to calculate the optical response of metallic structures with feature size in the nanoscale plays an important role in plasmonics. Quantum hydrodynamic theory (QHT) provides an efficient description of the free-electron gas, where quantum effects of nonlocality and spill-out are taken into account. In this work, we introduce a general QHT that includes diffusion to account for the size-dependent broadening, which is a key problem in practical applications of surface plasmon. We will introduce a density-dependent diffusion coefficient to give very accurate linewidth. It is a self-consistent method, in which both the ground and excited states are solved by using the same energy functional, with the kinetic energy described by the Thomas-Fermi (TF) and von Weizsäcker (vW) formalisms. We numerically prove that the fraction of the vW should be around 0.4. In addition, our QHT method is stable by introduction of an electron density-dependent damping rate. For sodium nanosphere of various sizes, the plasmon energy and broadening by our QHT method are in excellent agreement with those by density functional theory and Kreibig formula. By applying our QHT method to sodium jellium nanorods of various sizes, we clearly show that our method enables a parameter-free simulation, i.e. without resorting to any empirical parameter such as size-dependent damping rate, diffusing coefficient and the fraction of the vW. It is found that there exists a perfect linear relation between the main longitudinal localized surface plasmon resonance wavelength and the aspect radio. The width decreases with increasing aspect ratio and height. The calculations show that our QHT method provides an explicit and unified way to account for size-dependent frequency shifts and broadening of arbitrarily shaped geometries. It is reliable and robust with great predicability, and hence provides a general and efficient platform to study plasmonics.

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“…Second, for the deep-strong-coupling regime (V > hω eg ) 83 , bound states can be formed of molecular excitation and photons, the approximation in Eq. ( 10) may become inappropriate 84,85 . These issues will be further explored in our future work.…”

Section: Discussionmentioning

confidence: 99%

Simple but accurate estimation of light-matter coupling strength and optical loss for a molecular emitter coupled with photonic modes

Wang,

Chuang,

Hsu

2021

Preprint

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Light-matter coupling strength and optical loss are two key physical quantities in cavity quantum electrodynamics (cQED), and their interplay determines whether light-matter hybrid states can be formed or not in chemical systems. In this study, by using macroscopic quantum electrodynamics (mQED) combined with a pseudomode approach, we present a simple but accurate method which allows us to quickly estimate the light-matter coupling strength and optical loss without free parameters. Moreover, for a molecular emitter coupled with photonic modes (including cavity modes and plasmon polartion modes), we analytically and numerically prove that the dynamics derived from the mQED-based wavefunction approach is mathematically equivalent to the dynamics governed by the cQED-based Lindblad master equation when the Purcell factor behaves like Lorentzians.

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Bound state and non-Markovian dynamics of a quantum emitter around a surface plasmonic nanostructure

Cited by 19 publications

References 102 publications

Reversible Population Dynamics at the Nanoscale for a Quantum Emitter Near a WSe2 Monolayer

Reversible Population Dynamics at the Nanoscale for a Quantum Emitter Near a WSe2 Monolayer

Parameter-free quantum hydrodynamic theory for plasmonics: Electron density-dependent damping rate and diffusion coefficient

Simple but accurate estimation of light-matter coupling strength and optical loss for a molecular emitter coupled with photonic modes

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