Correlation between Near-Field Enhancement and Dephasing Time in Plasmonic Dimers

Li, Yaolong; Sun, Quan; Zu, Shuai; Shi, Xu; Liu, Yunquan; Hu, Xiaoyong; Ueno, Kosei; Gong, Qihuang; Misawa, Hiroaki

doi:10.1103/physrevlett.124.163901

Cited by 33 publications

(25 citation statements)

References 51 publications

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“…The dephasing time, 𝜏 dephase , is around 15 fs, and consistent with the reported value for gold. 46,47 The dephasing time is largely responsible for the spectral shape on the Stokes side of the spectrum, with shorter dephasing time giving rise to a broader energy distribution. We hypothesize that the monotonic increase of the plasmon dephasing time is likely related to the formation of graphitic carbon species on the sample surface during our measurements.…”

Section: Resultsmentioning

confidence: 99%

The connection between plasmon decay dynamics and the surface enhanced Raman spectroscopy background: Inelastic scattering from non-thermal and hot carriers

Cheng

Zhao

et al. 2021

Journal of Applied Physics

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Recent studies have established that the anti-Stokes Raman signal from plasmonic metal nanostructures can be used to determine the two separate temperatures that characterize carriers inside the metal-the temperature of photoexcited "hot carriers" and carriers that are thermalized with the metal lattice. However, the related signal in the Stokes spectral region has historically impeded surface enhanced Raman spectroscopy (SERS), as the vibrational peaks of adsorbed molecules are always accompanied by the broad background of the metal substrate. The fundamental source of the metal signal, and hence its contribution to the spectrum, has been unclear. Here, we outline a unified theoretical model that describes both the temperature dependent behavior and the broad spectral distribution. We suggest that the majority of the Raman signal is from inelastic scattering directly with non-thermal carriers that have been excited via damping of the surface plasmon. In addition, a significant spectral component (~ 1%) is due to a subpopulation of hot carriers in an elevated thermal distribution. We have performed temperature and power-dependent Raman experiments to show how a simple fitting procedure reveals the plasmon dephasing time, as well as the temperatures of the hot carriers and the metal lattice, in order to correlate these parameters with quantitative Raman analysis of chemical species adsorbed on metal surface.

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Section: Resultsmentioning

confidence: 99%

The connection between plasmon decay dynamics and the surface enhanced Raman spectroscopy background: Inelastic scattering from non-thermal and hot carriers

Cheng

Zhao

et al. 2021

Journal of Applied Physics

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“…The TES dephasing time of each SSH nanochain can be obtained by PEEM, 29,30 through our dynamic measurement of the nanochain length dependence under longitudinally (L) polarized excitation, we find that the dephasing time of plasmonic TESs first increases as the nanochain length increases and then reaches saturation. This result clearly shows that during the TES evolution process, there is coupling between the bulk lattices and the edges, and the coupling affects the TESs dephasing time.…”

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confidence: 90%

Near-Field Imaging and Time-Domain Dynamics of Photonic Topological Edge States in Plasmonic Nanochains

et al. 2021

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Time-domain dynamic evolution properties of topological states play an important role in both fundamental physics study and practical applications of topological photonics. However, owing to the absence of available ultrafast time-domain dynamic characterization methods, studies have mostly focused on the frequency-domain-based properties, and there are few reports demonstrating the time-domain-based properties. Here, we measured the dynamic near-field responses of plasmonic topological structures of gold nanochains with the configuration of the Su−Schrieffer−Heeger model by using ultrahigh spatialtemporal resolution photoemission electron microscopy. The dephasing time of plasmonic topological edge states increases with increasing the bulk lattice number that has a threshold requirement and finally reaches saturation. We directly revealed through simulation that there is a transient bulk state in the evolution of topological edge states, that is, the energy undergoes relaxation from oscillation between the bulk lattice and the edge. This work shows a new perspective of time-domain dynamic topological photonics.

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“…Furthermore, we investigated the local electric-field distribution on the Cd 3 As 2 metasurface using PEEM. The PEEM is a nonscanning high-spatial-resolution instrument that collects photoelectrons to image. , The PEEM is a powerful tool for investigating photonic modes, including surface plasmon polaritons, , dielectric waveguides, , and QCW modes . In our previous work, we demonstrated that the photoemission intensity of Cd 3 As 2 is proportional to the electric field intensity.…”

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confidence: 99%

Metasurface Enabled Photothermoelectric Photoresponse of Semimetal Cd₃As₂ for Broadband Photodetection

et al. 2022

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The artificial engineering of photoresponse is crucial for optoelectronic applications, especially for photodetectors. Here, we designed and fabricated a metasurface on a semimetallic Cd3As2 nanoplate to improve its thermoelectric photoresponse. The metasurface can enhance light absorption, resulting in a temperature gradient. This temperature gradient can contribute to thermoelectric photoresponse through the photothermoelectric effect. Furthermore, power-dependent measurements showed a linearly dependent photoresponse of the Cd3As2 metasurface device, indicating a second-order photocurrent response. Wavelength-dependent measurements showed that the metasurface can efficiently separate photoexcited carriers in the broadband range of 488 nm to 4 μm. The photoresponse near the metasurface boundaries exhibits a responsivity of ∼1 mA/W, which is higher than that near the electrode junctions. Moreover, the designed metasurface device provided an anisotropic polarization-dependent photoresponse rather than the isotropic photoresponse of the original Cd3As2 device. This study demonstrates that metasurfaces have excellent potential for artificial controllable photothermoelectric photoresponse of various semimetallic materials.

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Correlation between Near-Field Enhancement and Dephasing Time in Plasmonic Dimers

Cited by 33 publications

References 51 publications

The connection between plasmon decay dynamics and the surface enhanced Raman spectroscopy background: Inelastic scattering from non-thermal and hot carriers

The connection between plasmon decay dynamics and the surface enhanced Raman spectroscopy background: Inelastic scattering from non-thermal and hot carriers

Near-Field Imaging and Time-Domain Dynamics of Photonic Topological Edge States in Plasmonic Nanochains

Metasurface Enabled Photothermoelectric Photoresponse of Semimetal Cd₃As₂ for Broadband Photodetection

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Correlation between Near-Field Enhancement and Dephasing Time in Plasmonic Dimers

Cited by 33 publications

References 51 publications

The connection between plasmon decay dynamics and the surface enhanced Raman spectroscopy background: Inelastic scattering from non-thermal and hot carriers

The connection between plasmon decay dynamics and the surface enhanced Raman spectroscopy background: Inelastic scattering from non-thermal and hot carriers

Near-Field Imaging and Time-Domain Dynamics of Photonic Topological Edge States in Plasmonic Nanochains

Metasurface Enabled Photothermoelectric Photoresponse of Semimetal Cd3As2 for Broadband Photodetection

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Metasurface Enabled Photothermoelectric Photoresponse of Semimetal Cd₃As₂ for Broadband Photodetection