Coherent Control of Light Scattering from Nanostructured Materials by Second-Harmonic Generation

Rodrigo, Sergio G.; Harutyunyan, Hayk; Novotny, Lukas

doi:10.1103/physrevlett.110.177405

Cited by 43 publications

(45 citation statements)

References 37 publications

(24 reference statements)

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“…The literature suggests that the interference between different second harmonic modes, and thus their relative phase, plays an important role in the observed emission patterns [42,43]. Especially, it was shown that the phase induced by the fundamental dipolar mode allows controlling the forward and backward second harmonic emission [27,42,44]. For this reason, the multipolar analysis is further refined in Fig.…”

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confidence: 99%

Revealing a Mode Interplay That Controls Second-Harmonic Radiation in Gold Nanoantennas

et al. 2017

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In this work, we investigate the generation of second harmonic light by gold nanorods and demonstrate that the collected nonlinear intensity depends upon a phase interplay between different modes available in the nanostructure. By recording the backward and forward emitted second harmonic signals from nanorods with various lengths, we find that the maximum nonlinear signal emitted in the forward and backward directions is not obtained for the same 2 nanorod length. We confirm the experimental results with the help of full-wave computations done with a surface integral equation method. These observations are explained by the multipolar nature of the second harmonic emission, which emphasizes the role played by the relative phase between the second harmonic modes. Our findings are of a particular importance for the design of plasmonic nanostructures with controllable nonlinear emission and nonlinear plasmonic sensors as well as for the coherent control of harmonic generations in plasmonic nanostructures. Motivated by different specific features, the study of nonlinear optical processes in plasmonic nanostructures has become a vivid field of research [1, 2]. First, the intrinsic nonlinear response of plasmonic materials enables the investigation of subtle nonlinear mechanisms associated with the surface [3, 4], the shape [2], the roughness [5, 6], and the symmetry [2] of plasmonic nanostructures. Second, local field enhancement associated with the plasmon resonances can boost nonlinear processes including second harmonic generation (SHG) [7-9], third harmonic generation [10][11][12], and nonlinear photoluminescence [13][14][15][16], such that these nonlinear signals provide indirect entry to the local field enhancement [17][18][19]. Third, the plasmonic modes associated with a nanostructure are the underlying framework upon which nonlinear processes can be built [20,21]. It is only quite recently that the role played in nonlinear plasmonics by the interaction between the different modes available at the fundamental and harmonic frequencies has been recognized, leading to different multiresonant nanostructure designs that benefit from the interaction of several plasmonic modes at different frequencies [21][22][23][24][25]. This is especially the case for SHG where a dipolar excitation at the fundamental frequency produces a nonlinear signal which is essentially quadrupolar [26].

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Revealing a Mode Interplay That Controls Second-Harmonic Radiation in Gold Nanoantennas

et al. 2017

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“…SH generation from nanostructured metals has received wide interest in the last few years. The dependence of the SH radiation on the polarization of the pump beam and the particle shape has been addressed for metallic colloids as well as for planar arrays of nanoparticles on a substrate [8][9][10][11][12][13][14][15][16][17][18][19][20][21].…”

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Size-dependent second-harmonic generation from gold nanoparticles

et al. 2014

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We experimentally and theoretically investigated the second-harmonic (SH) radiation from spherical gold nanoparticles as function of the particle radius in the range from 40 to 100 nm. By fitting the measured SH intensity to an analytical model, we demonstrated size-dependent second-order susceptibility tensor components, which significantly increase by reducing the size of the particles. Finally, we found new SH polarization diagrams for large particle radii arising from the interference among the different multipolar terms

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“…All-optical coherent control of surface plasmons in single or coupled nanoantennas is of fundamental importance, since they can be viewed as building blocks of plasmonic metamaterials (MMs), metasurfaces and optical components such as sensors, switches, transistors and light sources. Coherent control over the linear [6,10], nonlinear [11] and spatially nonlocal [12] responses of plasmonic nanoantennas has been reported, as well as controlling the directionality of emission, scattering patterns and absorption in nanoparticles (NPs) involving nonlinear processes [13][14][15]. Moreover, coherent control of modal excitations in plasmonic metamolecules are investigated through adjusting the position of an exciting high-energy electron beam over a dolman style resonator [16] or by changing the relative phase of two orthogonally polarized light fields, exciting a triple nanorod structure [17].…”

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Refraction enhancement in plasmonics by coherent control of plasmon resonances

Panahpour¹,

Mahmoodpoor²,

Lavrinenko

2019

Phys. Rev. B

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A plasmonic nanoantenna probed by a plane-polarized optical field in a medium with no gain materials can show zero absorption or even amplification, while exhibiting maximal polarizability. This occurs through coupling to an adjacent nanoantenna in a specially designed metamolecule, which is pumped by an orthogonal optical field with /2  phase shift. The introduced scheme is a classical counterpart of an effect known in quantum optics as enhancement of the index of refraction (EIR). In contrary to electromagnetically induced transparency (EIT), where the medium is rendered highly dispersive at the point of zero susceptibility and minimum absorption, in the EIR the system exhibits large susceptibility and low dispersion at the point of zero or negative absorption. The plasmonic analogue of the EIR allows for coherent control over the polarizability and absorption of plasmonic nanoantennas, offering a novel approach to all optical switching and coherent control of transmission, diffraction and polarization conversion properties of plasmonic nanostructures, as well as propagation properties of surface plasmon polaritons on metasurfaces. It may also open up the way for lossless or amplifying propagation of optical waves in zero-index to high refractive index plasmonic metamaterials. Optical response of surface plasmons are mostly governed by metal and ambient medium parameters, geometry of structures and also by plasmon hybridization, which can result in novel resonance line-shapes, enabling the plasmonic systems to mimic some quantum optical effects such as Fano interference and EIT [1-5]. The functionality of the plasmonic nanostructures is significantly improved through active plasmonics and specifically by all-optical

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Coherent Control of Light Scattering from Nanostructured Materials by Second-Harmonic Generation

Cited by 43 publications

References 37 publications

Revealing a Mode Interplay That Controls Second-Harmonic Radiation in Gold Nanoantennas

Revealing a Mode Interplay That Controls Second-Harmonic Radiation in Gold Nanoantennas

Size-dependent second-harmonic generation from gold nanoparticles

Refraction enhancement in plasmonics by coherent control of plasmon resonances

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