Plexcitonic Quasi‐Bound States in the Continuum

Zheng, Peng; Raj, Piyush; Mizutani, Takayuki; Szabo, Miklos; Hanson, William A; Barman, Ishan

doi:10.1002/smll.202102596

Cited by 6 publications

(6 citation statements)

References 57 publications

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“…where, A p and A q are the amplitudes of the oscillations, Ω is the angular frequency of the coupled oscillators, and ϕ p and ϕ q are the initial phases of the oscillators. The equations for the amplitudes and angular frequency of the coupled oscillators can be derived from eqn (10) and (11), which are given by:…”

Section: Plexciton Photonicsmentioning

confidence: 99%

“…8,9 The inherent properties of the material, as well as the configuration and environment in which plexcitons, plasmons, and excitons are generated and interact, can significantly influence their observed values. [10][11][12] Therefore, it is essential to perform a meticulous evaluation of the performance metrics relevant to the specific application and to assess the feasibility of incorporating plexcitons into practical devices involved.…”

Section: Introductionmentioning

confidence: 99%

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Plexcitonics: plasmon–exciton coupling for enhancing spectroscopy, optical chirality, and nonlinearity

Chen

Sun

2023

Nanoscale

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Section: Plexciton Photonicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Plexcitonics: plasmon–exciton coupling for enhancing spectroscopy, optical chirality, and nonlinearity

Chen

Sun

2023

Nanoscale

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“…Such a plasmonic substrate was selected because of the well-established fabrication protocol based on the nanosphere lithography and its well-understood optical properties for plasmonic biosensing that have been detailed in our previous studies. [39][40][41][42][43] The fabricated gold nanopyramid array featured a sharp pyramidal geometry arranged hexagonally onto the quartz substrate (Figure 2a). The sharp vertices and edges have been found to contribute to a significant local EM field enhancement for superior SERS applications.…”

Section: Resultsmentioning

confidence: 99%

A Dual‐Modal Single‐Antibody Plasmonic Spectro‐Immunoassay for Detection of Small Molecules

Zheng

Raj

et al. 2022

Small

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Small molecules play a pivotal role in regulating physiological processes and serve as biomarkers to uncover pathological conditions and the effects of therapeutic treatments. However, it remains a significant challenge to detect small molecules given the size as compared to macromolecules. Recently, the newly emerging plasmonic immunoassays based on surface‐enhanced Raman scattering (SERS) offer great promise to deliver extraordinary sensitivity. Nevertheless, they are limited by the intrinsic SERS intensity fluctuations associated with the SERS uncertainty principle. The single transducer that relies on the intensity change is also prone to false signals. Additionally, the prevailing sandwich immunoassay format proves less effective towards detecting small molecules. To circumvent these critical issues, a dual‐modal single‐antibody approach that synergizes both the intensity and shift of the peak‐based immunoassay with Raman enhancement, coined as the INSPIRE assay, is developed for small molecules detection. With two independent transduction mechanisms, it allows better prediction of analyte concentration and attenuation of signal artifacts, providing a new and robust strategy for molecular analysis. With a proof‐of‐concept demonstration for detection of free T4 and testosterone in serum matrix, the authors envision that the INSPIRE assay could be expanded for a wide spectrum of applications in biomedical diagnosis, discovery of new biopharmaceuticals, food safety, and environmental monitoring.

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“…Such asymmetric coupling can be further elaborated by tailoring the coupling strength g pc , which can be feasibly controlled by cavity engineering, such as modifying relative positions of plasmonic nanocavity and microcavity [87] or changing the shapes and sizes of the plasmonic nanostructures such as nanoparticles [88]. Particularly, we focus on Im( + + E 3 e p c ) to estimate the strong coupling regions for the e + p+c system.…”

Section: Effect Of Cavity Shb Locationmentioning

confidence: 99%

Cavity spectral-hole-burning to boost coherence in plasmon-emitter strong coupling systems

Zhou¹,

You²,

Xiong³

et al. 2022

Nanotechnology

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Significant decoherence of the plasmon-emitter (i.e., plexcitonic) strong coupling systems hinders the progress towards their applications in quantum technology due to the unavoidable lossy nature of the plasmons. Inspired by the concept of spectral-hole-burning (SHB) for frequency-selective bleaching of the emitter ensemble, we propose “cavity SHB” by introducing cavity modes with moderate quality factors to the plexcitonic system to boost its coherence. We show that the detuning of the introduced cavity mode with respect to the original plexcitonic system, which defines the location of the cavity SHB, is the most critical parameter. Simultaneously introducing two cavity modes of opposite detunings, the excited-state population of the emitter can be enhanced by 4.5 orders of magnitude within 300 fs, and the attenuation of the emitter’s population can be slowed down by about 56 times. This theoretical proposal provides a new approach of cavity engineering to enhance the plasmon-emitter strong coupling systems’ coherence, which is important for realistic hybrid-cavity design for applications in quantum technology.

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Plexcitonic Quasi‐Bound States in the Continuum

Cited by 6 publications

References 57 publications

Plexcitonics: plasmon–exciton coupling for enhancing spectroscopy, optical chirality, and nonlinearity

Plexcitonics: plasmon–exciton coupling for enhancing spectroscopy, optical chirality, and nonlinearity

A Dual‐Modal Single‐Antibody Plasmonic Spectro‐Immunoassay for Detection of Small Molecules

Cavity spectral-hole-burning to boost coherence in plasmon-emitter strong coupling systems

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