Photoluminescence Properties of Gold Nanorod and <i>J</i>-Aggregate Hybrid Systems Studied by Scanning Near-Field Optical Microscopy

Hasegawa, Seiju; Imura, Kohei

doi:10.1021/acs.jpcc.2c00513

Cited by 4 publications

(3 citation statements)

References 34 publications

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“…Traditionally, the strong coupling (SC) of optical microcavities and excitons has been studied extensively, but it also involves considerable experimental difficulties, such as cryogenic temperatures, ultrahigh vacuum, and production problems. , These problems can be solved well using plasmonic nanocavity systems because they can break through the diffraction limit to localize the light at the nanometer scale. So plasmonic nanocavity can not only enhance the emission of the excitons but also easily achieve SC at room temperature. , Therefore, in recent years, studies on the SC of plasmonic nanocavities and excitons have made big progresses. − …”

Section: Introductionmentioning

confidence: 99%

Strong Coupling of Ag@Au Hollow Nanocube/J-Aggregate Heterostructures by Absorption Spectra

Zhang

et al. 2022

J. Phys. Chem. C

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Achieving strong light−matter interactions at room temperature is critical for the study of quantum optics and advanced quantum applications. In this paper, we constructed a hybrid system composed of Ag@Au hollow nanocubes (HNCs) and J-aggregates to realize the strong plasmon−exciton interaction at room temperature. First, by changing the shell thickness of Ag@ Au HNCs, we tuned the localized surface plasmon resonance wavelength (λ LSPR ) near the exciton peak (575 nm). Furthermore, there is an obvious anticrossing curve in the hybrid structure, and the Rabi splitting is about 179 meV. Finally, the finite-difference time-domain (FDTD) method was utilized to simulate the absorption spectra of the above nanostructure, and the results matched well with the experimental results. We believe that achieving strong interactions lies in decreasing the volume of the local surface plasmon mode of the Ag@Au HNCs, which is approximately 8645 nm 3 . This work may provide a useful reference value for further exploration of basic optical material research or the development of advanced quantum devices.

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Section: Introductionmentioning

confidence: 99%

Strong Coupling of Ag@Au Hollow Nanocube/J-Aggregate Heterostructures by Absorption Spectra

Zhang

et al. 2022

J. Phys. Chem. C

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“…Gold nanorods (125 nm in length and 60 nm in width) were dispersed on a glass substrate, and 1 mmol/L tetraphenylporphyrin tetrasulfonic acid (TPPS) solution was spin-coated at 3000 rpm for 90 s to form TPPS J-aggregates. In this system, the peak splits into upper and lower branches as a consequence of the strong coupling between plasmons excited in gold nanorods and excitons excited in the TPPS J-aggregates. − Figure (a,b) shows the demodulated scattering and absorption spectra of the hybrid system, respectively. The scattering spectrum shows peak-like features near 700 and 740 nm.…”

Section: Resultsmentioning

confidence: 99%

Development of Absorption and Scattering Microspectroscopy Using a Phase-Stepping Method

Fukata,

Shirayama,

Imura

2024

J. Phys. Chem. C

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Nanoparticles with subwavelength dimensions exhibit unique optical properties due to strong light-matter interactions and have received much attention in not only fundamental science but also applied science. The optical properties of the nanoparticles include both light scattering and absorption, and for practical applications, detailed knowledge of the scattering and absorption properties at the single nanoparticle level is indispensable. For this purpose, the development of a novel spectroscopic method for achieving simultaneous measurement of the absorption and scattering properties is desirable. The phasestepping modulation technique enables the demodulation of a spectroscopic component for overlapped components and is promising for this purpose. In this study, we developed a novel spectroscopic technique by combining bright-field optical microscopy with a phase-step modulation method to simultaneously measure the absorption and scattering properties of nanoparticles.

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“…Herein, we develop a novel active probe by grafting a fluorescent nanosphere at the apex of a polymer tip that can act as a microlens [9,10] with the aim of overcoming the lack of stability of the secondary source. Taking advantage of the high intensity of the fluorescent nanosphere and its high sensitivity to the near-field radiation, this active probe enables the range of applications of near-field scanning techniques to be broadened to the nanoscale characterizations of optical properties such as plasmonic hot spots, the photoluminescence properties of gold nanostructures, and optical polarization responses [11,12].…”

mentioning

confidence: 99%

Advanced active polymer probe for near-field optics

Chen¹,

Jiang²,

Issa³

et al. 2023

Opt. Lett.

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We report on a novel, to the best of our knowledge, active probe for scanning near-field optical microscopy (SNOM). A fluorescent nanosphere, acting as the secondary source, is grafted in an electrostatic manner at the apex of a polymer tip integrated into the extremity of an optical fiber. Thanks to the high photostability and sensitivity of the secondary source, the near-field interaction with a gold nanocube is investigated. It is shown that the spatial resolution is well defined by the size of the fluorescent nanosphere. The polarization-dependent near-field images, which are consistent with the simulation, are ascribed to the local excitation rate enhancement. Meanwhile, measurement of the distance-dependent fluorescence lifetime of the nanosphere provides strong evidence that the local density of states is modified so that extra information on nano-emitters can be extracted during near-field scanning. This advanced active probe can thus potentially broaden the range of applications to include nanoscale thermal imaging, biochemical sensors, and the manipulation of nanoparticles.

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Photoluminescence Properties of Gold Nanorod and J-Aggregate Hybrid Systems Studied by Scanning Near-Field Optical Microscopy

Cited by 4 publications

References 34 publications

Strong Coupling of Ag@Au Hollow Nanocube/J-Aggregate Heterostructures by Absorption Spectra

Strong Coupling of Ag@Au Hollow Nanocube/J-Aggregate Heterostructures by Absorption Spectra

Development of Absorption and Scattering Microspectroscopy Using a Phase-Stepping Method

Advanced active polymer probe for near-field optics

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