Evanescent-Vacuum-Enhanced Photon-Exciton Coupling and Fluorescence Collection

Ren, Juanjuan; Gu, Ying; Zhao, Dongxing; Zhang, Fan; Zhang, Tiancai; Gong, Qihuang

doi:10.1103/physrevlett.118.073604

Cited by 74 publications

(61 citation statements)

References 53 publications

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“…An emerging field is to study the nanoscale light-matter interaction between plasmonic mode and few or even single quantum emitters (e.g., atoms, molecules or quantum dots, etc). For example, in the weak coupling regime LSPRs are widely used to enhance fluorescence [6][7][8] and Raman scattering [9][10][11] and to achieve unidirectional emission [12]; in the strong coupling regime the coherent hybridizations between plasmonic resonances and quantum emitters have also been investigated both theoretically [13][14][15][16][17][18] and experimentally [19][20][21][22][23][24][25].Two approaches have been taken to achieve singleemitter strong coupling -lowering the mode volumes and suppressing the dissipation. The former typically requires ultra-fine geometries with nanometer or even subnanometer precision [20,25], posing challenges on fabricating metallic structures and positioning individual quantum emitters.…”

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confidence: 99%

Enhancing Coherent Light-Matter Interactions through Microcavity-Engineered Plasmonic Resonances

Peng

Liu²,

et al. 2017

Phys. Rev. Lett.

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Localized-surface plasmon resonance is of importance in both fundamental and applied physics for the subwavelength confinement of optical field, but realization of quantum coherent processes is confronted with challenges due to strong dissipation. Here we propose to engineer the electromagnetic environment of metallic nanoparticles (MNPs) using optical microcavities. An analytical quantum model is built to describe the MNP-microcavity interaction, revealing the significantly enhanced dipolar radiation and consequentially reduced Ohmic dissipation of the plasmonic modes. As a result, when interacting with a quantum emitter, the microcavity-engineered MNP enhances the quantum yield over 40 folds and the radiative power over one order of magnitude. Moreover, the system can enter the strong coupling regime of cavity quantum electrodynamics, providing a promising platform for the study of plasmonic quantum electrodynamics, quantum information processing, precise sensing and spectroscopy.Metallic nanostructures confine light on the subwavelength scale due to the collective excitation of electrons known as localized-surface plasmon resonances (LSPRs). Ultrasmall mode volumes of the plasmonic resonances down to cubic nanometers make them a powerful platform for fundamental studies and novel applications, such as spaser [1,2], superlens [3] and quantum plasmonics [4,5]. An emerging field is to study the nanoscale light-matter interaction between plasmonic mode and few or even single quantum emitters (e.g., atoms, molecules or quantum dots, etc). For example, in the weak coupling regime LSPRs are widely used to enhance fluorescence [6][7][8] and Raman scattering [9][10][11] and to achieve unidirectional emission [12]; in the strong coupling regime the coherent hybridizations between plasmonic resonances and quantum emitters have also been investigated both theoretically [13][14][15][16][17][18] and experimentally [19][20][21][22][23][24][25].Two approaches have been taken to achieve singleemitter strong coupling -lowering the mode volumes and suppressing the dissipation. The former typically requires ultra-fine geometries with nanometer or even subnanometer precision [20,25], posing challenges on fabricating metallic structures and positioning individual quantum emitters. For the latter, the dipolar plasmonic modes dissipates through both radiation and Ohmic absorption, while the multipole modes are purely absorptive [26]. A better coherence can be achieved by reducing the excitation of multipole modes or enhancing the excitation of dipolar modes. Thus, efforts have been made to tailor the geometry of the metallic nanostructures, for example, elongating a metallic nanoparticle (MNP) to separate the dipolar and multipole resonances [27], and forming dimer or arrays to obtain stronger coupling of a certain dipolar mode [28]. An alternative approach is cancelling the coupling between the emitters and the multipole modes with emitters homogeneously distributed around the metallic structure [29]. Despite of these efforts, the ...

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confidence: 99%

Enhancing Coherent Light-Matter Interactions through Microcavity-Engineered Plasmonic Resonances

Peng

Liu²,

et al. 2017

Phys. Rev. Lett.

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132

120

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“…Finally, several light sources can be simultaneously coupled into the nanowaveguide, enabling specific detection of nanoparticles. The nanofiber-array-based probe can further be extended to study nanoparticle interactions and quantum electromagnetic dynamics 38 , 57 , 58 , 59 , 60 , and the scattering effects can also be used in microscopic techniques 61 , 62 , 63 , 64 , 65 .…”

Section: Discussionmentioning

confidence: 99%

Optically sizing single atmospheric particulates with a 10-nm resolution using a strong evanescent field

Zhi

Tang

et al. 2018

Light Sci Appl

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Although an accurate evaluation of the distribution of ultrafine particulate matter in air is of utmost significance to public health, the usually used PM2.5 index fails to provide size distribution information. Here we demonstrate a low-profile and cavity-free size spectrometer for probing fine and ultrafine particulate matter by using the enhanced particle-perturbed scattering in strong optical evanescent fields of a nanofiber array. The unprecedented size resolution reaches 10 nm for detecting single 100-nm-diameter nanoparticles by employing uniform nanofibers and controlling the polarizations of the probe light. This size spectrometry was tested and used to retrieve the size distribution of particulate matter in the air of Beijing, yielding mass concentrations of nanoparticles, as a secondary exercise, consistent with the officially released data. This nanofiber-array probe shows potential for the full monitoring of air pollution and for studying early-stage haze evolution and can be further extended to explore nanoparticle interactions.

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“…Finally, the quantum emitter (at the hotspots) oriented along the Z axis is chosen because its total decay rate is several dozen times larger than that of X or Y axis oriented dipole emitters. Using the similar module, we have studied the nanoparticle surface plasmon resonance images of electrocatalytic activity 68 , and the efficient emission of single photons and reversible photon-exciton interaction in the GSPs nanostructures 23 , 69 .…”

Section: Methodsmentioning

confidence: 99%

High-contrast switching and high-efficiency extracting for spontaneous emission based on tunable gap surface plasmon

Ren

Duan

et al. 2018

Sci Rep

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Controlling spontaneous emission at optical scale lies in the heart of ultracompact quantum photonic devices, such as on-chip single photon sources, nanolasers and nanophotonic detectors. However, achiving a large modulation of fluorescence intensity and guiding the emitted photons into low-loss nanophotonic structures remain rather challenging issue. Here, using the liquid crystal-tuned gap surface plasmon, we theoretically demonstrate both a high-contrast switching of the spontaneous emission and high-efficiency extraction of the photons with a specially-designed tunable surface plasmon nanostructures. Through varying the refractive index of liquid crystal, the local electromagnetic field of the gap surface plasmon can be greatly modulated, thereby leading to the swithching of the spontaneous emission of the emitter placed at the nanoscale gap. By optimizing the material and geometrical parameters, the total decay rate can be changed from 103γ0 to 8750γ0, [γ0 is the spontaneous emission rate in vacuum] with the contrast ratio of 85. Further more, in the design also enables propagation of the emitted photons along the low-loss phase-matched nanofibers with a collection efficiency of more than 40%. The proposal provides a novel mechanism for simultaneously switching and extracting the spontaneous emitted photons in hybrid photonic nanostructures, propelling the implementation in on-chip tunable quantum devices.

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Evanescent-Vacuum-Enhanced Photon-Exciton Coupling and Fluorescence Collection

Cited by 74 publications

References 53 publications

Enhancing Coherent Light-Matter Interactions through Microcavity-Engineered Plasmonic Resonances

Enhancing Coherent Light-Matter Interactions through Microcavity-Engineered Plasmonic Resonances

Optically sizing single atmospheric particulates with a 10-nm resolution using a strong evanescent field

High-contrast switching and high-efficiency extracting for spontaneous emission based on tunable gap surface plasmon

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