Plasmonic enhancement of second harmonic generation on metal coated nanoparticles

Wunderlich, Sarina; Peschel, Ulf

doi:10.1364/oe.21.018611

Cited by 19 publications

(20 citation statements)

References 68 publications

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“…Second-harmonic generation (SHG) by resonant nanoparticles has recently been actively studied both theoretically [1][2][3][4][5] and experimentally [6][7][8][9][10][11] in order to develop nanosized light sources. The absence of phase matching conditions at the subwavelength scales results in significant drop of the generation efficiency, making the exploitation of resonances in such nanoscale structures the only way to enhance SHG.…”

Section: Introductionmentioning

confidence: 99%

Second-harmonic generation in dielectric nanoparticles with different symmetries

Frizyuk¹

2019

J. Opt. Soc. Am. B

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In this work we study second-harmonic generation a monocrystalline nanoparticle with a non-centrosymmetric crystalline lattice. It was shown that breaking the symmetry of the nanoparticle's shape can significantly affect the second harmonic radiation pattern. We propose a method for explaining and predicting the generated field for arbitrary nanoparticles and provide selection rules for nanoparticles with several different symmetries. IntroductionSecond-harmonic generation (SHG) by resonant nanoparticles has recently been actively studied both theoretically [1-5] and experimentally [6][7][8][9][10][11] in order to develop nanosized light sources. The absence of phase matching conditions at the subwavelength scales results in significant drop of the generation efficiency, making the exploitation of resonances in such nanoscale structures the only way to enhance SHG. During the last few decades, metallic nanostructures supporting localized surface plasmon esonances have been actively studied -while the lattice of typical plasmonic materials has a center of inversion, second harmonic (SH) generation is still possible by surface and nonlocal volume effects [12][13][14][15][16]. In more recent developments, nanoparticles from dielectrics and semiconductors with a non-centrosymmetric crystalline lattice and bulk second order non-linearity [17][18][19][20] have been extensively studied. Mie-resonances supported by these dielectric nanoparticles [21] can lead to several orders of magnitude increase in SHG efficiency compared to metal structures [22]. Despite the large number of studies in this area, the full physical picture explaining SHG enhancement in all-dielectric nanostructures has yet to be identified. Selection rules, i.e. rules that determine the correspondence between the modes excited at the fundamental frequency and the modes at the second harmonic, play one of the most important roles. Selection rules for SHG in nanoparticles from materials that do not have bulk nonlinearity, such as gold, silicon, etc., were studied in detail in [23] for spherical particles, and in [24] for particles of other shapes. Despite the many studies devoted to the investigation of SHG from nanoparticles with bulk nonlinearity, the nature of the multipole composition of the generated fields, as well as the effect of nanoparticle symmetry on it, has not been studied in detail. In most of the works, the results of the SH fields' multipole expansion numerical calculations are presented without an explanation of the physical nature of the appearance of certain modes in the spectrum. The goal of this work is to determine the selection rules for SHG by dielectric nanoparticles with arbitrary symmetries and with a nonlinear susceptibility tensor χ (2) . In particular, we will show that a violation of the symmetry can strongly affect the mode composition and, as a result, the radiation pattern of the SH. Derivation of selection rulesAccording to [21,[25][26][27][28], the field E, which satisfies the Helmholtz equation ∇ 2 E + ε ω c 2 E = 0 ...

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Section: Introductionmentioning

confidence: 99%

Second-harmonic generation in dielectric nanoparticles with different symmetries

Frizyuk¹

2019

J. Opt. Soc. Am. B

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“…As these compounds share the same crystalline structure, they represent an interesting opportunity to investigate how the SHG properties change with the nature of the cation and the anion. Furthermore, as most biological applications of NLO materials in recent years involve powdered samples (Haber et al, 2011;Wunderlich & Peschel, 2013;Bä umner et al, 2010;Staedler et al, 2012), we also optimized a new method to measure the SHG efficiency on a small quantity of powder at different wavelengths of excitation, trying to determine the quadratic coefficient relevant to the second-order susceptibility. Furthermore, we also attempted to assess the reduction of the SH intensity for small quantities of nano-crystals, in order to ascertain the possibility of applications in biological systems.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, structure and non-linear optical properties of new isostructural β-D-fructopyranose alkaline halide metal–organic frameworks: a theoretical and an experimental study

Marabello

Antoniotti

Benzi

et al. 2017

Acta Crystallogr Sect B

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In this work four metal-organic framework isomorphs, based on fructose and alkali-earth halogenides, were investigated to better understand the effect of the size of the cation and the different polarizability of the anion on the calculated hyperpolarizability and optical susceptibility, which are correlated to non-linear optical properties. The compounds were characterized by X-ray diffraction and the first hyperpolarizability and the second-order susceptibility were obtained from theoretical calculations. Furthermore, a new method to measure the second-harmonic (SH) efficiency on a small quantity of powder at different wavelengths of excitation was optimized and an attempt was made to assess the reduction of the SH intensity for small quantities of nano-crystals, in order to ascertain the possibility of applications in biological systems. The results of this work show that both the intrinsic nature of the anion and the induced dissociation of cations and anions by fructose play a role in the second-harmonic generating properties of such compounds.

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“…Surface plasmon polaritons (SPPs) are propagating electromagnetic waves that are confined along metal-dielectric interfaces and are coupled with collective electron oscillations [1]. Due to their subwavelength nature and spatially confined field energy, SPPs can localize guided waves beyond the diffraction limit, and thus their exploitation is promising for applications in integrated optics [2,3], field enhancement [4][5][6], sensing [7,8], and imaging [9,10]. A major pursuit of current plasmonics research is to develop compact and efficient components to manipulate SPP propagation.…”

Section: Introductionmentioning

confidence: 99%

Directional excitation of surface plasmons by dielectric resonators

et al. 2015

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We describe intricate cavity mode structures, that are possible in waveguide devices with two or more guided modes. The main element is interference between the scattered fields of two modes at the facets, resulting in multipole or mode cancelations. Therefore, strong coupling between the modes, such as around zero group velocity points, is advantageous to obtain high quality factors. We discuss the mechanism in three different settings: a cylindrical structure with and without negative group velocity mode, and a surface plasmon device. A general semi-analytical expression for the cavity parameters describes the phenomenon, and it is validated with extensive numerical calculations.

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Plasmonic enhancement of second harmonic generation on metal coated nanoparticles

Cited by 19 publications

References 68 publications

Second-harmonic generation in dielectric nanoparticles with different symmetries

Second-harmonic generation in dielectric nanoparticles with different symmetries

Synthesis, structure and non-linear optical properties of new isostructural β-D-fructopyranose alkaline halide metal–organic frameworks: a theoretical and an experimental study

Directional excitation of surface plasmons by dielectric resonators

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