Dynamically Modulating the Surface Plasmon Resonance of Doped Semiconductor Nanocrystals

García, Guillermo; Buonsanti, Raffaella; Runnerstrom, Evan L.; Mendelsberg, Rueben J.; Llordés, Anna; Anders, André; Richardson, Thomas J.; Milliron, Delia J.

doi:10.1021/nl202597n

Cited by 515 publications

(628 citation statements)

References 29 publications

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“…Such a tunability also exists in doped semiconductors where the resonance frequency instead is controlled by the doping level (as shown experimentally in [23]). In Fig.…”

Section: Resultsmentioning

confidence: 74%

Size-dependent nonlocal effects in plasmonic semiconductor particles

Maack¹,

Mortensen²,

Wubs³

2017

EPL

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Localized surface plasmons (LSP) in semiconductor particles are expected to exhibit spatial nonlocal response effects as the geometry enters the nanometer scale. To investigate these nonlocal effects, we apply the hydrodynamic model to nanospheres of two different semiconductor materials: intrinsic InSb and n-doped GaAs. Our results show that the semiconductors indeed display nonlocal effects, and that these effects are even more pronounced than in metals. In a 150 nm InSb particle at 300 K, the LSP frequency is blueshifted 35%, which is orders of magnitude larger than the blueshift in a metal particle of the same size. This property, together with their tunability, makes semiconductors a promising platform for experiments in nonlocal effects.

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“…Such a tunability also exists in doped semiconductors where the resonance frequency instead is controlled by the doping level (as shown experimentally in [23]). In Fig.…”

Section: Resultsmentioning

confidence: 74%

Size-dependent nonlocal effects in plasmonic semiconductor particles

Maack¹,

Mortensen²,

Wubs³

2017

EPL

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“…18 These novel types of NCs could also be used for solar cells which harvest the infrared portion of the solar spectrum, or in smart windows that transmit or block visible light and heat, therefore improving the energy efficiency of buildings. 14 The reversible tunability of the LSPRs is arguably one of the strongest points in favour of semiconductor NCs, as compared to metals. This could be exploited for realising waveguide modulators and switches at telecommunication wavelengths.…”

Section: Introductionmentioning

confidence: 99%

New materials for tunable plasmonic colloidal nanocrystals

2014

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We present a review on the emerging materials for novel plasmonic colloidal nanocrystals. We start by explaining the basic processes involved in surface plasmon resonances in nanoparticles and then discuss the classes of nanocrystals that to date are particularly promising for tunable plasmonics: nonstoichiometric copper chalcogenides, extrinsically doped metal oxides, oxygen-deficient metal oxides and conductive metal oxides. We additionally introduce other emerging types of plasmonic nanocrystals and finally we give an outlook on nanocrystals of materials that could potentially display interesting plasmonic properties.

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“…They investigated the strong influence of self--doping on the plasmonic response of the nanoparticles, and in particular, on their tunability. Recently, the plasmonic response in heavily doped metal and transition metal oxides nanocrystals has also been described [37,38]. While ultrafast plasmonics has been studied extensively in noble metal nanoparticles, not much is known instead about the recently developed heavily--doped semiconductor nanocrystals that likewise exhibit localized surface plasmon resonance.…”

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confidence: 99%

Plasmonics in heavily-doped semiconductor nanocrystals

et al. 2013

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Abstract:Heavily--doped semiconductor nanocrystals characterized by a tunable plasmonic band have been gaining increasing attention recently. Herein, we introduce this type of materials focusing on their structural and photo--physical properties. Beside their continuous--wave plasmonic response, depicted both theoretically and experimentally, we also review recent results on their transient ultrafast response. This was successfully interpreted by adapting models of the ultrafast response of noble metal nanoparticles. IntroductionThe optical features exhibited by metallic nano--systems have been the subject of an intensive theoretical and experimental research, resulting in applications in several fields, from surface--enhanced spectroscopy, to biological and chemical nano--sensing [1]. Such developments are primarily due to the localized surface plasmon resonance (LSPR), which results in intense optical absorption and scattering as well as sub--wavelength localization of large electrical fields in the vicinity of the nano--object [2--10]. The plasmonic response of these metallic nanostructures is strongly dependent on the type of metal of which they are made, on the dielectric function of the surrounding medium, on the particle shape and, even if to a lesser extent, on the particle size. Nanoparticles of several metals, such as Ag, Au, Cu and Pt, exhibiting plasmonic response in the ultraviolet and in the visible regions of the spectrum have been successfully synthesized in the past decades [11--15]. Elongated metallic nanoparticles have been shown to exhibit plasmonic response in the near infrared, due to excitation of the longitudinal plasmon mode [16--18]. It has been recently reported that direct optical excitation of the metal by intense femtosecond laser pulses induces an ultra--fast modulation of the plasmonic resonance, which can be used for ultra--fast modulation of signals [19], paving the way to ultrafast active plasmonics. A quantitative investigation of such dynamical features is therefore crucial for the development of a new generation of ultra--fast nano--devices. Pump--probe spectroscopy, giving access to the electronic excitation and subsequent relaxation processes in the material, is to date the most suitable tool for the experimental study of the ultrafast dynamical features exhibited by plasmonic nanostructures. So far, several noble metal structures have been investigated, including spherical nanoparticles [20--22] and nanorods [23], revealing that the physical processes of excitation and relaxation are actually similar to those observed in bulk (i.e. in thin films) metallic systems, that are the electron--electron, the electron--phonon and the phonon--phonon interactions [24,25].

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Dynamically Modulating the Surface Plasmon Resonance of Doped Semiconductor Nanocrystals

Cited by 515 publications

References 29 publications

Size-dependent nonlocal effects in plasmonic semiconductor particles

Size-dependent nonlocal effects in plasmonic semiconductor particles

New materials for tunable plasmonic colloidal nanocrystals

Plasmonics in heavily-doped semiconductor nanocrystals

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