Femtosecond-pulsed optical heating of gold nanoparticles

Baffou, Guillaume; Rigneault, Hervé

doi:10.1103/physrevb.84.035415

Cited by 275 publications

(427 citation statements)

References 55 publications

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“…23,24 Another experimental issue is the heating of the nanostructure under strong light illumination. 56 The observation of nonlinear optical processes requires the use of ultrashort laser sources and resonating absorption at the fundamental wavelength can result in nanostructure damages. We have performed complementary simulations considering a fundamental wavelength λ = 800 nm, which corresponds to the operating wavelength of the majority of available femtosecond laser sources.…”

Section: Etallic Nanostructures Supporting Surface Plasmon Resonancmentioning

confidence: 99%

Ultrasensitive Optical Shape Characterization of Gold Nanoantennas Using Second Harmonic Generation

2013

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Second harmonic generation from plasmonic nanoantennas is investigated numerically using a surface integral formulation for the calculation of both the fundamental and the second harmonic electric field. The comparison between a realistic and an idealized gold nanoantenna shows that second harmonic generation is extremely sensitive to asymmetry in the nanostructure shape even in cases where the linear response is barely modified. Interestingly, minute geometry asymmetry and surface roughness are clearly revealed by far-field analysis, demonstrating that second harmonic generation is a promising tool for the sensitive optical characterization of plasmonic nanostructures. Furthermore, defects located where the linear field is strong (e.g., in the antenna gap) do not necessarily have the strongest impact on the second harmonic signal. KEYWORDS: Plasmonics, nonlinear optics, surface integral formulation, realistic nanostructures Furthermore, the coupling between several substructures is a convenient way to control SPR properties.2,3 In particular, bringing two nanostructures in close proximity results in an enhancement by several orders of magnitude of the electric field in the hot spot. This geometry is called a nanoantenna, or an optical antenna, since it represents the optical analogous of microwave and radiowave antennas.4−6 The electromagnetic properties of nanoantennas can be tuned by modifying their geometric parameters (length, shape, and gap dimension) and tailored for specific applications.7 For instance, optical antennas have been designed for studying quantum systems at the single emitter level, Optical antennas are also promising for the observation of nonlinear optical effects that require a high electric field such as that observed in the hot spots.19 Several studies have reported the observation of multiphoton excited luminescence, 20−22 second harmonic generation (SHG), 23,24 third harmonic generation, 25,26 high harmonic generation, 27 and four-wave mixing, 28 as well as ultrafast spectroscopy. 29,30 Recently, a new approach has been proposed to enhance nonlinear conversion in nanoantennas, using structures that are resonant at the several wavelengths involved in the frequency conversion. 31−33Among the different nonlinear parametric optical processes, SHG is the simplest one and has the advantage of being sensitive to the symmetry of the plasmonic nanostructures as well as their spatial arrangement. 34−40 Contrary to the other nonlinear optical processes, it was observed that SHG can be significantly suppressed in centrosymmetric gaps, although the fundamental electric field is strongly enhanced. 41 On the other hand, efficient SHG is observed in asymmetric gaps, such as the one formed in noncentrosymmetric T-shaped gold dimers.42 A clear insight into the impact of the nanoantenna shape on their SHG properties, particularly in the far-field, is therefore required to guide further the development of SHG from nanoantennas for practical applications like nonlinear plasmonics sensing. 4...

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Section: Etallic Nanostructures Supporting Surface Plasmon Resonancmentioning

confidence: 99%

Ultrasensitive Optical Shape Characterization of Gold Nanoantennas Using Second Harmonic Generation

2013

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“…The impact of a Continuous-Wave (CW) illumination on the temperature of a nanoparticle (NP) has been the subject of much research in the last decade [1][2][3][4]. These researches consolidate the actual efforts aiming to evaluate and/or to optimize the potential use of NPs for photothermal therapy or photothermal imaging [5,6], and light-assisted nanomaterial growth [7].…”

Section: Introductionmentioning

confidence: 99%

Temperature of a nanoparticle above a substrate under radiative heating and cooling

Kallel¹,

Carminati²,

Joulain³

2017

Phys. Rev. B

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Controlling the temperature in architectures involving nanoparticles and substrates is a key issue for applications involving micro and nanoscale heat transfer. We study the thermal behavior of a single nanoparticle interacting with a flat substrate under external monochromatic illumination, and with thermal radiation as the unique heat loss channel. We develop a model to compute the temperature of the nanoparticle, based on an effective dipole-polarizability approach. Using numerical simulations, we thoroughly investigate the impacts of various parameters affecting the nanoparticle temperature, such as the nanoparticle-to-substrate gap distance, the incident light wavelength and polarization, or the material resonances. This study provides a tool for the thermal characterization and design of micro or nanoscale systems coupling substrates with nanoparticles or optical antennas.

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“…For pulsed excitation of plasmonic nanoparticles with the same average laser power, heat diffusion and initial transient temperature increase at the nanoparticle surface are different. 45 We therefore characterized the spatial and axial photothermal profiles (Figs. 2a and 2b) and signal-to-noise ratios (SNR, Figs.…”

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confidence: 99%

Single-Particle Absorption Spectroscopy by Photothermal Contrast

et al. 2015

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Removing effects of sample heterogeneity through single-molecule and single-particle techniques has advanced many fields. While background free luminescence and scattering spectroscopy is widely used, recording the absorption spectrum only is rather difficult. Here we present an approach capable of recording pure absorption spectra of individual nanostructures. We demonstrate the implementation of single-particle absorption spectroscopy on strongly scattering plasmonic nanoparticles by combining photothermal microscopy with a supercontinuum laser and an innovative calibration procedure that accounts for chromatic aberrations and wavelength-dependent excitation powers. Comparison of the absorption spectra to the scattering spectra of the same individual gold nanoparticles reveals the blueshift of the absorption spectra, as predicted by Mie theory but previously not detectable in extinction measurements that measure the sum of absorption and scattering. By covering a wavelength range of 300 nm, we are furthermore able to record absorption spectra of single gold nanorods with different aspect ratios. We find that the spectral shift between absorption and scattering for the longitudinal plasmon resonance decreases as a function of nanorod aspect ratio, which is in agreement with simulations.

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Femtosecond-pulsed optical heating of gold nanoparticles

Cited by 275 publications

References 55 publications

Ultrasensitive Optical Shape Characterization of Gold Nanoantennas Using Second Harmonic Generation

Ultrasensitive Optical Shape Characterization of Gold Nanoantennas Using Second Harmonic Generation

Temperature of a nanoparticle above a substrate under radiative heating and cooling

Single-Particle Absorption Spectroscopy by Photothermal Contrast

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