Harmonic generation at the nanoscale

Bonacina, Luigi; Brevet, Pierre‐François; Finazzi, Marco; Celebrano, Michele

doi:10.1063/5.0006093

Cited by 70 publications

(82 citation statements)

References 187 publications

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“…Molecular aggregates are ubiquitous in nature. They may be found on many occasions, especially in the field of soft matter, where structures like micelles, liposomes, or vesicles are often encountered, and can be used as nanoscale probes for nonlinear optics alongside other nanoparticles [1,2]. The organization of the molecules at the microscopic level in these aggregates defines the properties or the function of these nanostructures.…”

Section: Introductionmentioning

confidence: 99%

Second Harmonic Scattering of Molecular Aggregates

et al. 2021

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A general model is developed to describe the polarization-resolved second harmonic scattering (SHS) response from a liquid solution of molecular aggregates. In particular, the molecular spatial order is introduced to consider the coherent contribution, also known as the retarded contribution, besides the incoherent contribution. The model is based on the description of a liquid suspension of molecular dyes represented by point-like nonlinear dipoles, locally excited by the fundamental field and radiating at the harmonic frequency. It is shown that for a non-centrosymmetrical spatial arrangement of the nonlinear dipoles, the SHS response is very similar to the purely incoherent response, and is of electric dipole origin. However, for centrosymmetrical or close to centrosymmetrical spatial arrangements of the nonlinear dipoles, the near cancellation of the incoherent contribution due to the inversion symmetry rule allows the observation of the coherent contribution of the SHS response, also known as the electric quadrupole contribution. This model is illustrated with experimental data obtained for aqueous solutions of the dye Crystal Violet (CV) in the presence of sodium dodecyl sulfate (SDS) and mixed water-methanol solutions of the dye 4-(4–dihexadecylaminostyryl)-N-methylpyridinium iodide (DiA), a cationic amphiphilic probe molecule with a strong first hyper-polarizability; both CV and DiA form molecular aggregates in these conditions. The quantitative determination of a retardation parameter opens a window into the spatial arrangements of the dyes in the aggregates, despite the small nanoscale dimensions of the latter.

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Section: Introductionmentioning

confidence: 99%

Second Harmonic Scattering of Molecular Aggregates

et al. 2021

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“…In addition, chiral metasurfaces can be applied to demonstrate chiral metamirrors [ 74 ], multi-mode orbital angular momentum (OAM) generators [ 65 ], OAM sensors [ 126 ], intense light sources [ 127 , 128 ], and color filters [ 129 ]. Apart from these applications, another significant application of chiroptical metasurfaces lies in chiral sensing [ 130 , 131 ], which can directly benefit biomedical and pharmaceutical industries. We believe that research in chiroptical metasurfaces will promote further improvement and integration within various different fields.…”

Section: Discussionmentioning

confidence: 99%

Chiroptical Metasurfaces: Principles, Classification, and Applications

Kim

Rana

Kim

et al. 2021

Sensors

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Chiral materials, which show different optical behaviors when illuminated by left or right circularly polarized light due to broken mirror symmetry, have greatly impacted the field of optical sensing over the past decade. To improve the sensitivity of chiral sensing platforms, enhancing the chiroptical response is necessary. Metasurfaces, which are two-dimensional metamaterials consisting of periodic subwavelength artificial structures, have recently attracted significant attention because of their ability to enhance the chiroptical response by manipulating amplitude, phase, and polarization of electromagnetic fields. Here, we reviewed the fundamentals of chiroptical metasurfaces as well as categorized types of chiroptical metasurfaces by their intrinsic or extrinsic chirality. Finally, we introduced applications of chiral metasurfaces such as multiplexing metaholograms, metalenses, and sensors.

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“…[ 4–8 ] Nevertheless, for many nonlinear nanophotonics applications, it is highly desirable to use multiresonant plasmonic devices that can simultaneously enhance multiphoton excitation/emission processes in several different wavelength bands at the same hotspot locations. [ 9–19 ]…”

Section: Introductionmentioning

confidence: 99%

“…[4][5][6][7][8] Nevertheless, for many nonlinear nanophotonics applications, it is highly desirable to use multiresonant plasmonic devices that can simultaneously enhance multiphoton excitation/emission processes in several different wavelength bands at the same hotspot locations. [9][10][11][12][13][14][15][16][17][18][19] For constructing multiresonant plasmonic devices, a general approach is to assemble multiple building-block plasmonic resonators within a very close distance; and the optical coupling between spectrally matched non-orthogonal elementary modes of building blocks can result in multiple hybrid plasmonic modes of different resonance wavelengths that spatially overlap. [20][21][22] Based on the geometrical configuration of building-block resonators, multiresonant plasmonic devices can be classified into three types: 1) in-plane arrangement, [9,11,12,15,18,[23][24][25][26][27] 2) core-shell arrangement, [14,[28][29][30][31][32] and 3) out-of-plane arrangement.…”

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confidence: 99%

Two‐Tier Nanolaminate Plasmonic Crystals for Broadband Multiresonant Light Concentration with Spatial Mode Overlap

Tali

Song

Nam

et al. 2021

Advanced Optical Materials

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scattering, photoluminescence, and electroluminescence. [4][5][6][7][8] Nevertheless, for many nonlinear nanophotonics applications, it is highly desirable to use multiresonant plasmonic devices that can simultaneously enhance multiphoton excitation/emission processes in several different wavelength bands at the same hotspot locations. [9][10][11][12][13][14][15][16][17][18][19] For constructing multiresonant plasmonic devices, a general approach is to assemble multiple building-block plasmonic resonators within a very close distance; and the optical coupling between spectrally matched non-orthogonal elementary modes of building blocks can result in multiple hybrid plasmonic modes of different resonance wavelengths that spatially overlap. [20][21][22] Based on the geometrical configuration of building-block resonators, multiresonant plasmonic devices can be classified into three types: 1) in-plane arrangement, [9,11,12,15,18,[23][24][25][26][27] 2) core-shell arrangement, [14,[28][29][30][31][32] and 3) out-of-plane arrangement. [33][34][35][36][37] Since it is straightforward to create plasmonic systems with accurate nanoscale control of planar geometries by top-down nanolithography, most previous studies have focused on developing in-plane multiresonant plasmonic devices. [9,11,12,15,18,[23][24][25][26][27] Despite the simplicity in design and fabrication, in-plane multiresonant plasmonic devices face two severe limitations due to the planar layout of multiple building-block resonators. 1) The device footprint tends to be large, and accordingly, the surface density of multiresonant hotspots is typically low; 2) Since the nearest-neighbor coupling of elementary modes dominates between in-plane arranged building-block resonators, the planar multiresonant systems usually support a limited number (<4) of hybridized plasmonic modes with spatial overlaps. Recently, Reshef et al. demonstrated that using in-plane plasmonic metasurfaces with a finite out-of-plane dielectric cladding can increase the number of modes by creating several Fabry-Perot-like (FP-like) resonances. [38] However, such a method primarily depends on the broad electric dipolar plasmonic modes, limiting the maximum attainable absorption to 50% [39] and keeping the field enhancement factor relatively small compared to nanogap plasmonic modes. [20] As the second type of multiresonant plasmonic devices, chemically synthesized core-shell metalinsulator-metal (MIM) multilayered nanoparticles can support multiple hybrid modes by mixing the elementary modes at Effective trapping and nanolocalization of different colored photons simultaneously at the same position remain a challenge in nanophotonics research but can boost applications based on nonlinear multiphoton processes. For achieving broadband nanoscale light concentration, a promising strategy is to employ multiresonant plasmonic devices that support multiple hybridized surface plasmon modes with spatial overlap at several different resonance wavelengths. However, high-order plasmonic modes from hybri...

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Harmonic generation at the nanoscale

Abstract: Bonacina et al.

Cited by 70 publications

References 187 publications

Second Harmonic Scattering of Molecular Aggregates

Second Harmonic Scattering of Molecular Aggregates

Chiroptical Metasurfaces: Principles, Classification, and Applications

Two‐Tier Nanolaminate Plasmonic Crystals for Broadband Multiresonant Light Concentration with Spatial Mode Overlap

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