The role of Rabi splitting tuning in the dynamics of strongly coupled J-aggregates and surface plasmon polaritons in nanohole arrays

Wang, Hai; Toma, Andréa; Wang, Hai‐Yu; Bozzola, Angelo; Miele, Ermanno; Haddadpour, Ali; Veronis, Georgios; Angelis, Francesco De; Wang, Lei; Chen, Qi‐Dai; Xu, Huailiang; Sun, Hong–Bo; Zaccaria, Remo Proietti

doi:10.1039/c6nr01588c

Cited by 44 publications

(36 citation statements)

References 45 publications

(58 reference statements)

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“…Indeed, the lifetime of hybrid states is sensitive to the coupling strength (the Rabi splitting), which is proportional to the quantity

\sqrt{N / V}

. In this respect, our group has investigated the TA response from a hybrid structure formed by gold nanoholes array and J‐aggregate molecules at variable concentration . The samples were pumped under 560 nm resonant excitation laser pulses corresponding to the wavelength of the upper hybrid band.…”

Section: Dynamics Of Strong Coupling With J‐aggregatesmentioning

confidence: 99%

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Dynamics of Strongly Coupled Hybrid States by Transient Absorption Spectroscopy

Wang

Sun

et al. 2018

Adv Funct Materials

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Since the birth of quantum mechanics the construction and control of novel hybrid quantum states are among the dream targets of scientists. In this regard, due to recent technological advances, hybrid states based on strong coupling occurring between light and matter have become a laboratory reality. For example, it is demonstrated that strong coupling involving microcavities or surface plasmon polaritons shows great potential for novel nanoplasmonic devices such as lasers, all-optical switching, field-effect transistors, and for the evergreen field of quantum computation. Further developments in this field require, however, a better understanding of the underlying mechanisms governing strong coupling, especially from a time-dependent point of view, time-resolved spectroscopy being one of the leading experimental approaches to address this aspect. In this perspective, after a brief introduction of the strong coupling concept, the recent research progress on the dynamics of strongly coupled systems involving J-aggregates, broadly absorptive dyes, semiconductor quantum dots, and perovskite films with either microcavities or surface plasmons polaritons is summarized and discussed. Finally, challenges and perspectives for developing strong coupling concept are further illustrated, with special attention to phonon-photon interaction, as one of the most intriguing topics in condensed matter physics.

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“…Indeed, the lifetime of hybrid states is sensitive to the coupling strength (the Rabi splitting), which is proportional to the quantity

\sqrt{N / V}

Section: Dynamics Of Strong Coupling With J‐aggregatesmentioning

confidence: 99%

“…In both cases, the normalized bleaching dynamics of J‐aggregates on a flat gold film is shown as reference (gray line). All panels reproduced with permission . Copyright 2016, Royal Society of Chemistry.…”

Section: Dynamics Of Strong Coupling With J‐aggregatesmentioning

confidence: 99%

Dynamics of Strongly Coupled Hybrid States by Transient Absorption Spectroscopy

Wang

Sun

et al. 2018

Adv Funct Materials

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“…[ 21–26 ] These geometries have proved to be powerful platforms for such purposes as trapping and manipulation of nano‐objects, [ 27,28 ] sensing applications, [ 29 ] enhancement of Raman signal of small molecules, [ 30 ] and realization of strong light–matter interactions. [ 31–33 ]…”

Section: Introductionmentioning

confidence: 99%

Novel Plasmonic Nanocavities for Optical Trapping‐Assisted Biosensing Applications

Koya

Cunha

Guo

et al. 2020

Advanced Optical Materials

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However, due to the intrinsic low optical response of small objects, there has been a clear trade-off between the size of a material and its response to light. [5] Recently, plasmonic nanostructures have emerged as leading platforms to enhance the weak optical signals of low dimensional materials including quantum dots (QDs), [6] small molecules, [7,8] and 2D monolayers. [9] The plasmonic enhancement of linear and nonlinear optical processes capitalizes on the near-and far-field properties of metallic (e.g., gold and silver) nanostructures. [10] One of the defining features of plasmonic nanostructures is their potential to confine light into deep subwavelength volumes, which has opened a new door to trap and manipulate dielectric, metallic, and biological nano-objects. [11] Moreover, metallic nanostructures are characterized by their capability to amplify the intensity of optical fields by orders of magnitude. The enhancement of local field intensity is attributed to the resonance of plasmon polaritons arising from the coupling of external electromagnetic fields to the collective oscillations of the conduction electrons. [12] A small perturbation (or change in the refractive index) of the near field zone of plasmonic nanostructures leads to significant shift in the plasmon polariton resonance wavelength, which has important implications for surface-enhanced sensing and spectroscopic applications. [13,14] Thus, for the ad-hoc enhancement of optical Plasmonic nanocavities have proved to confine electromagnetic fields into deep subwavelength volumes, implying their potentials for enhanced optical trapping and sensing of nanoparticles. In this review, the fundamentals and performances of various plasmonic nanocavity geometries are explored with specific emphasis on trapping and detection of small molecules and single nanoparticles. These applications capitalize on the local field intensity, which in turn depends on the size of plasmonic nanocavities. Indeed, properly designed structures provide significant local field intensity and deep trapping potential, leading to manipulation of nano-objects with low laser power. The relationship between optical trappinginduced resonance shift and potential energy of plasmonic nanocavity can be analytically expressed in terms of the intercavity field intensity. Within this framework, recent experimental works on trapping and sensing of single nanoparticles and small molecules with plasmonic nanotweezers are discussed. Furthermore, significant consideration is given to conjugation of optical tweezers with Raman spectroscopy, with the aim of developing innovative biosensors. These devices, which take the advantages of plasmonic nanocavities, will be capable of trapping and detecting nanoparticles at the single molecule level.

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“…Confining the light field to small effective volumes in this way enables stronger coupling with the emitter [23,24]. The interaction between plasmonic resonances and the nearby excitonic transition of emitters gives rise to socalled plexcitonic coupling (or plexcitons) [1,[25][26][27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Strong coupling with directional absorption features of Ag@Au hollow nanoshell/J-aggregate heterostructures

Sun

et al. 2019

Nanophotonics

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Tunable plasmon-exciton coupling is demonstrated at room temperature in hybrid systems consisting of Ag@Au hollow nanoshells (HNSs) and J-aggregates. The strong coupling depends on the exciton binding energy and the localized surface plasmon resonance strength, which can be tuned by changing the thickness of the Ag@Au HNS. An evident anticrossing dispersion curve in the coupled energy diagram of the hybrid system was observed based on the absorption spectra obtained at room temperature. In this paper, strong coupling was observed twice (first at lower wavelength and then also at a higher wavelength) via a single preparation process of the Ag@Au HNS system. The first Rabi splitting energy (ħΩ) is 225 meV. Then, the extinction spectra of the bare Ag@Au HNS and the Ag@Au HNS-J-aggregate hybrid system were reproduced by numerical simulations using the finite-difference time domain method, which were in good agreement with the experimental observations. We attributed the strong coupling of the new shell hybrid system to the reduced local surface plasmon (LSP) mode volume of the Ag@Au HNS. This volume is about 1021.6 nm3. The features of the Ag@Au HNS nanostructure with a small LSP mode volume enabled strong light-matter interactions to be achieved in single open plasmonic nanocavities. These findings may pave the way toward nanophotonic devices operating at room temperature.

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The role of Rabi splitting tuning in the dynamics of strongly coupled J-aggregates and surface plasmon polaritons in nanohole arrays

Cited by 44 publications

References 45 publications

Dynamics of Strongly Coupled Hybrid States by Transient Absorption Spectroscopy

Dynamics of Strongly Coupled Hybrid States by Transient Absorption Spectroscopy

Novel Plasmonic Nanocavities for Optical Trapping‐Assisted Biosensing Applications

Strong coupling with directional absorption features of Ag@Au hollow nanoshell/J-aggregate heterostructures

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