Drude Relaxation Rate in Grained Gold Nanoantennas

Chen, Kuo‐Ping; Drachev, Vladimir P.; Borneman, Joshua D.; Kildishev, Alexander V.; Shalaev, Vladimir M.

doi:10.1021/nl9037246

Cited by 183 publications

(193 citation statements)

References 24 publications

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“…In particular it has been shown that the plasmon linewidth of polycrystalline gold NPs is strongly affected by the grain size. 59 We conclude that the collection of polycrystalline NPs have intrinsic dephasing rates around 20% higher than singledomain NPs due to the electron scattering on their crystal defects. This result reveals the important and often neglected role of twins in determining the LSPR linewidth.…”

Section: Localized Surface Plasmon Resonancementioning

confidence: 79%

Size and nanocrystallinity controlled gold nanocrystals: synthesis, electronic and mechanical properties

et al. 2015

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The influence of nanocrystallinity on the electronic and mechanical properties of metal nanoparticles is still poorly understood, due to the difficulty in synthesizing nanoparticles with a controlled internal structure. Here, we report on a new method for the selective synthesis of Au nanoparticles in either a singledomain or a polycrystalline phase maintaining the same chemical environment. We obtain quasi-spherical nanoparticles whose diameter is tunable from 6 to 13 nm with a resolution down to ≈0.5 nm and narrow size distribution (4-5%). The availability of such high-quality samples allows the study of the impact of the particle size and nanocrystallinity on a number of parameters, such as plasmon dephasing time, electronphonon coupling, period and damping time of the radial breathing modes.

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Section: Localized Surface Plasmon Resonancementioning

confidence: 79%

Size and nanocrystallinity controlled gold nanocrystals: synthesis, electronic and mechanical properties

et al. 2015

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“…The imaginary part of the dielectric function 2 ( Figure 1b,d,f) increases monotonically with increasing temperature for all heating cycles. However, for the first cycle the increase in 2 ( Figure 1b) is not uniform which is due to the annealing effects and grain movements that occur at high temperatures 27 . The increase in 2 is more uniform for the subsequent cycles (Figure 1d,f).…”

Section: Resultsmentioning

confidence: 96%

Temperature-dependent optical properties of gold thin films

Reddy

Guler

Kildishev

et al. 2016

Opt. Mater. Express

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175

165

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ABSTRACT:Understanding the temperature dependence of the optical properties of thin metal films is critical for designing practical devices for high temperature applications in a variety of research areas, including plasmonics and near-field radiative heat transfer. Even though the optical properties of bulk metals at elevated temperatures have been studied, the temperature-dependent data for thin metal films, with thicknesses ranging from few tens to few hundreds of nanometers, is largely missing. In this work we report on the optical constants of single-and polycrystalline gold thin films at elevated temperatures in the wavelength range from 370 to 2000 nm. Our results show that while the real part of the dielectric function changes marginally with increasing temperature, the imaginary part changes drastically. For 200-nm-thick single-and polycrystalline gold films the imaginary part of the dielectric function at 500 0 C becomes nearly twice larger than that at room temperature. In contrast, in thinner films (50-nm and 30-nm) the imaginary part can show either increasing or decreasing behavior within the same temperature range and eventually at 500 0 C it becomes nearly 3-4 times larger than that at room temperature. The increase in the imaginary part at elevated temperatures significantly reduces the surface plasmon polariton propagation length and the quality factor of the localized surface plasmon resonance for a spherical particle. We provide experiment-fitted models to describe the temperature-dependent gold dielectric function as a sum of one Drude and two critical point oscillators. These causal analytical models could enable accurate multiphysics modelling of gold-based nanophotonic and plasmonic elements in both frequency and time domains. KEYWORDS: nanophotonics, plasmonics, metamaterials, metal optics, high temperatures, gold thin films, analytical models2 Nanometer-scale field localization is at the heart of metal-based nanophotonics, namely plasmonics [1][2][3][4] . In plasmonic nanostructures, strong field confinement -or so-called 'hot spots' -arise due to the excitation of subwavelength oscillations of free electrons coupled to the incident electromagnetic field at the metal-dielectric interface, known as surface plasmons 5 . Such nanoscale hot spots lead to high energy densities that inevitably increase the local temperature of the plasmonic material under study. Recently, there has been a growing interest in plasmonicsbased local heating applications such as heat-assisted magnetic recording, thermophotovoltaics, and photothermal therapy 6,7 .However, theoretical modeling of plasmonic structures in such local-heating based systems has so far been performed using room-temperature optical constants, i.e. with thermal analysis and optical material properties being decoupled. Therefore, probing the temperature dependence of the optical properties of thin metal films is critical for both gaining an insight into the physical process associated with elevated temperatures and for accurate modeling of ...

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“…Thermal annealing [ 31 ] is utilized to improve the modulation depth of the Fano resonance or to turn off the coupling. In particular, we carry out time-dependent in-situ studies of the plasmonic spectra during heating.…”

Section: Doi: 101002/adma201202109mentioning

confidence: 99%

Large‐Area Low‐Cost Plasmonic Nanostructures in the NIR for Fano Resonant Sensing

et al. 2012

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Large‐area low‐cost plasmonic nanostructures with high‐quality Fano resonances have been fabricated for the first time. Hole‐mask colloidal nanolithography is utilized and the degree of asymmetry of double split‐ring resonators is varied to optimize the modulation depth of the Fano resonances for refractive index sensing. In situ optical spectroscopy during thermal annealing monitors the spectral change to control improvement of sample quality. Liquids with different refractive indices yield experimental sensitivities of up to 520 nm/RIU and figures of merit of 2.9.

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Drude Relaxation Rate in Grained Gold Nanoantennas

Cited by 183 publications

References 24 publications

Size and nanocrystallinity controlled gold nanocrystals: synthesis, electronic and mechanical properties

Size and nanocrystallinity controlled gold nanocrystals: synthesis, electronic and mechanical properties

Temperature-dependent optical properties of gold thin films

Large‐Area Low‐Cost Plasmonic Nanostructures in the NIR for Fano Resonant Sensing

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