Plasmonic-photonic cavity for high-efficiency single-photon blockade

Lu, Yu‐Wei; Liu, Jingfeng; Liao, Zeyang

doi:10.1007/s11433-021-1712-2

Cited by 26 publications

(14 citation statements)

References 44 publications

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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%

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

Hu¹,

Ren-feng²,

Shan³

et al. 2022

Preprint

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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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Section: Discussionmentioning

confidence: 99%

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

Hu¹,

Ren-feng²,

Shan³

et al. 2022

Preprint

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“…Previous study has shown that the atom-photon quasi-bound state (qBS) can form in this kind of dissipation-mediated cQED system with ω a = ω c and 14) by finding the condition of a purely real eigenvalue, which is shown to yield the highest single-photon efficiency [31,32]. In order to achieve the best 1PB performance, in the following study we will apply the aforementioned condition of atom-photon qBS.…”

Section: Effective Atom-photon Interaction and Chiralitymentioning

confidence: 99%

Single-photon blockade in quasichiral atom–photon interaction: simultaneous high purity and high efficiency

Lu¹,

Liu²,

Li³

et al. 2022

New J. Phys.

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We investigate the single-photon blockade (1PB) in the quasichiral regime of atom-photon interaction, where the effective coupling between the cavity and the atom is bidirectional but asymmetrical, achieved by coupling to a dissipative environment. A synthetic magnetic current Φ is induced in the closed-loop coupling, which breaks down the reciprocity of atom-photon interaction and results in an asymmetrical or even unidirectional effective coupling between two selected quantum states. As an example, we couple the single-atom cavity-QED (cQED) system to a strongly dissipative plasmonic cavity. We find that in the quasichiral regime, the unconventional photon blockade (UPB) and the conventional photon blockade (CPB) realize simultaneously in the condition of maximum chirality (Φ = π/2 and 3π/2). As a result, 1PB in the quasichiral regime can combine the advantages of both UPB and CPB, demonstrating the perfect single-photon purity, higher efficiency, non-oscillating time dynamics as well as lower requirement of mode coupling to achieve UPB. Our work paves the way for single-photon blockade towards practical applications and reveals the intriguing quantum-optics phenomena in the quasichiral light-matter interaction.

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“…Furthermore, one can obtain the LDOS of target nanophotonic structure that owns desirable quantum effects of EPs for EM design. This is important for structure optimization, especially for these consisting of absorbing and dispersing medium like the plasmonicphotonic cavity [76][77][78][79], where the coupling rate between cavity modes is hard to evaluate, contract to the ES microcavity studied in this work. On the other hand, the quantum-optics properties of a given nanophotonic structure are predictable, by parametrizing the extended cascaded QME (Eq.…”

Section: Is the Spectral Density Of Es Microcavity The Correlation Fu...mentioning

confidence: 99%

Anomalous spontaneous emission dynamics at chiral exceptional points

Lu¹,

Zhao²,

Li³

et al. 2022

Preprint

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An open quantum system operated at the spectral singularities where dimensionality reduces, known as exceptional points (EPs), demonstrates distinguishing behavior from the Hermitian counterpart. Based on the recently proposed microcavity with exceptional surface (ES), we report and explain the peculiar quantum dynamics in atom-photon interaction associated with EPs: cavity transparency, decoherence suppression beyond the limitation of Jaynes-Cummings (JC) system, and the population trapping of lossy cavity. An analytical description of the local density of states (LDOS) for ES microcavity is derived from an equivalent cavity quantum electrodynamics (QED) model, which goes beyond the single-excitation approximation and allows exploring the quantum effects of EPs on multiphoton process by parametrizing the extended cascaded quantum master equation. It reveals that a square Lorentzian term in LDOS induced by second-order EPs interferes with the linear Lorentzian profile, giving rise to cavity transparency for atom with special transition frequency in the weak coupling regime. This additional contribution from EPs also breaks the limit on dissipation rate of JC system bounded by bare components, resulting in the decoherence suppression with anomalously small decay rate of the long-time dynamics and the Rabi oscillation. Remarkably, we find that the cavity population can be partially trapped at EPs, achieved by forming a bound dressed state in the limiting case of vanishing atom decay. Our work unveils the exotic phenomena unique to EPs in cavity QED systems, which opens the door for controlling light-matter interaction at the quantum level through non-Hermiticity, and holds great potential in building high-performance quantum-optics devices.

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Plasmonic-photonic cavity for high-efficiency single-photon blockade

Cited by 26 publications

References 44 publications

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

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

Single-photon blockade in quasichiral atom–photon interaction: simultaneous high purity and high efficiency

Anomalous spontaneous emission dynamics at chiral exceptional points

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