Manipulation of the dephasing time by strong coupling between localized and propagating surface plasmon modes

Yang, Jinghuan; Sun, Quan; Ueno, Kosei; Shi, Xu; Oshikiri, Tomoya; Misawa, Hiroaki; Gong, Qihuang

doi:10.1038/s41467-018-07356-x

Cited by 98 publications

(83 citation statements)

References 51 publications

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“…The IFRAC measurements suggest that the nonlinear emission stems from multiple localized hot spots on the surface of the nanosponges, but are unable to resolve emission from a single hot spot. For this, we employed interferometric time-resolved photoemission electron microscopy (tr-PEEM) [31][32][33][34][35][36] . Similar to IFRAC, the sample is excited by a pair of few-cycle pulses, centered at~800 nm.…”

Section: Photoelectron Emission From Individual Plasmonic Hot Spotsmentioning

confidence: 99%

Nonlinear plasmon-exciton coupling enhances sum-frequency generation from a hybrid metal/semiconductor nanostructure

Zhong

Vogelsang

et al. 2020

Nat Commun

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The integration of metallic plasmonic nanoantennas with quantum emitters can dramatically enhance coherent harmonic generation, often resulting from the coupling of fundamental plasmonic fields to higher-energy, electronic or excitonic transitions of quantum emitters. The ultrafast optical dynamics of such hybrid plasmon-emitter systems have rarely been explored. Here, we study those dynamics by interferometrically probing nonlinear optical emission from individual porous gold nanosponges infiltrated with zinc oxide (ZnO) emitters. Few-femtosecond time-resolved photoelectron emission microscopy reveals multiple longlived localized plasmonic hot spot modes, at the surface of the randomly disordered nanosponges, that are resonant in a broad spectral range. The locally enhanced plasmonic near-field couples to the ZnO excitons, enhancing sum-frequency generation from individual hot spots and boosting resonant excitonic emission. The quantum pathways of the coupling are uncovered from a two-dimensional spectrum correlating fundamental plasmonic excitations to nonlinearly driven excitonic emissions. Our results offer new opportunities for enhancing and coherently controlling optical nonlinearities by exploiting nonlinear plasmonquantum emitter coupling.

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Section: Photoelectron Emission From Individual Plasmonic Hot Spotsmentioning

confidence: 99%

Nonlinear plasmon-exciton coupling enhances sum-frequency generation from a hybrid metal/semiconductor nanostructure

Zhong

Vogelsang

et al. 2020

Nat Commun

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“…Despite its very simple structure, the peak splitting of the NHoM extinction spectrum has never been observed and reported. Numerous theoretical and experimental studies have been published with similar metal nanoparticles on mirror (NPoM) structures [40][41][42][43][44][45][46][47][48][49]. In many cases, nanosphere on mirror (NSoM) structures were used to obtain very small SP mode nanogaps generated between the metal nanoparticles and metal substrates to obtain strong surface-enhanced Raman spectroscopy (SERS) signals [40][41][42].…”

Section: Comparison With Previously Reported Npommentioning

confidence: 99%

Flexibly tunable surface plasmon resonance by strong mode coupling using a random metal nanohemisphere on mirror

et al. 2020

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AbstractWe propose a unique random metal nanohemisphere on mirror (NHoM) structure to tune the surface plasmon (SP) resonance in a flexible manner. The SP resonance peak was split into two peaks owing to the strong coupling between the SP mode in the metal nanohemisphere and the mirror image mode generated in the metal substrate. This phenomenon is based on the fact that the strong coupling and the induced electromagnetic effects are similar to those pertaining to the Rabi splitting, Fano resonance, and electromagnetically induced transparency, thus providing quantum effect analogies. These phenomena have recently attracted increased attention and have been studied with nanocavities fabricated with top-down nanotechnologies. Compared with previous reports, NHoM structures can be fabricated in a much easier manner and are tunable in rather wider wavelength regions without nanofabrication technologies. The SP resonance peaks were enhanced, sharpened dramatically, and tuned flexibly, based on the optimization of the thickness of the spacer layer between the metal hemisphere and metal substrate. Experimental results were reproduced and were explained based on finite difference time domain (FDTD) simulations. These phenomena have never been observed previously on similar nanosphere on mirror (NSoM) because nanohemispherical structures were required. The NHoM nanocavity structure has a quality factor >200 that is surprisingly high for the localized SP mode of nanoparticles. Flexible tuning of the SP resonance with the use of NHoM is envisaged to lead to the development of new applications and technologies in the field of plasmonics and nanophotonics.

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“…Surface plasmons (SPs), collective electron oscillations of the metallic nanostructure, can tightly confine the incident light into nanoscale 22 , which results in a strongly enhanced local field with ultrasmall mode volume and hence provides an advantaged platform for strong coupling investigations [23][24][25][26][27][28] . In the past decades, many attentions have been paid to plasmon-TMD-exciton systems for studying light-matter interactions, such as plasmon-induced resonance energy transfer 29,30 , tunable photoluminance by plasmon [31][32][33][34][35][36][37] and Fano resonance [38][39][40] .…”

Section: Introductionmentioning

confidence: 99%

Large Rabi splitting obtained in Ag-WS2 strong-coupling heterostructure with optical microcavity at room temperature

Li¹,

Zu²,

Zhang³

et al. 2019

Opto-Electronic Advances

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Manipulation of light-matter interaction is critical in modern physics, especially in the strong coupling regime, where the generated half-light, half-matter bosonic quasiparticles as polaritons are important for fundamental quantum science and applications of optoelectronics and nonlinear optics. Two-dimensional transition metal dichalcogenides (TMDs) are ideal platforms to investigate the strong coupling because of their huge exciton binding energy and large absorption coefficients. Further studies on strong exciton-plasmon coupling by combining TMDs with metallic nanostructures have generated broad interests in recent years. However, because of the huge plasmon radiative damping, the observation of strong coupling is significantly limited at room temperature. Here, we demonstrate that a large Rabi splitting (~300 meV) can be achieved at ambient conditions in the strong coupling regime by embedding Ag-WS 2 heterostructure in an optical microcavity. The generated quasiparticle with part-plasmon, part-exciton and part-light is analyzed with Hopfield coefficients that are calculated by using three-coupled oscillator model. The resulted plasmon-exciton polaritonic hybrid states can efficiently enlarge the obtained Rabi splitting, which paves the way for the practical applications of polaritonic devices based on ultrathin materials.

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Manipulation of the dephasing time by strong coupling between localized and propagating surface plasmon modes

Cited by 98 publications

References 51 publications

Nonlinear plasmon-exciton coupling enhances sum-frequency generation from a hybrid metal/semiconductor nanostructure

Nonlinear plasmon-exciton coupling enhances sum-frequency generation from a hybrid metal/semiconductor nanostructure

Flexibly tunable surface plasmon resonance by strong mode coupling using a random metal nanohemisphere on mirror

Large Rabi splitting obtained in Ag-WS2 strong-coupling heterostructure with optical microcavity at room temperature

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