Nonlinear Symmetry Breaking in Symmetric Oligomers

Rahmani, Mohsen; Shorokhov, Alexander S.; Hopkins, Ben; Miroshnichenko, Andrey E.; Shcherbakov, Maxim R.; Camacho‐Morales, Rocio; Fedyanin, Andrey A.; Neshev, Dragomir N.; Kivshar, Yuri S.

doi:10.1021/acsphotonics.6b00902

Cited by 33 publications

(34 citation statements)

References 59 publications

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“…Tunable plasmonic nanoantennas and metasurfaces have paved the way for many applications of nanoplasmonics ranging from sensors to inter and intrachip communication in optical circuits, particularly in the telecommunication range, for realizing all‐optical circuitry on a chip . Large tunability of plasmonic metasurfaces, due to the sensitivity of the near‐field's surface plasmon resonances to the refractive index of the environment, has been the key advantage for controlling the optical response.…”

Section: Introductionmentioning

confidence: 99%

Reversible Thermal Tuning of All‐Dielectric Metasurfaces

Rahmani

Miroshnichenko

et al. 2017

Adv Funct Materials

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159

124

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All-dielectric metasurfaces provide a powerful platform for a new generation of flat optical devices, in particular, for applications in telecommunication systems, due to their low losses and high transparency in the infrared. However, active and reversible tuning of such metasurfaces remains a challenge. This study experimentally demonstrates and theoretically justifies a novel scenario of the dynamical reversible tuning of all-dielectric metasurfaces based on the temperature-dependent change of the refractive index of silicon. How to design an all-dielectric metasurface with sharp resonances by achieving interference between magnetic dipole and electric quadrupole modes of constituted nanoparticles arranged in a 2D lattice is shown. Thermal tuning of these resonances can cause drastic but reciprocal changes in the directional scattering of the metasurface in a spectral window of 75 nm. This change can result in a 50-fold enhancement of the radiation directionality. This type of reversible tuning can play a significant role in novel flat optical devices including the metalenses and metaholograms.

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Section: Introductionmentioning

confidence: 99%

Reversible Thermal Tuning of All‐Dielectric Metasurfaces

Rahmani

Miroshnichenko

et al. 2017

Adv Funct Materials

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159

124

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“… 40 , 41 , 46 More importantly, these collective interactions significantly influence the efficiency of the SHG from the oligomer structure. 21 − 23 , 58 This is perhaps better seen in the calculated near-field maps of the second-harmonic fields for the oligomers and symmetrically illuminating and matching CVBs.…”

mentioning

confidence: 85%

Collective Effects in Second-Harmonic Generation from Plasmonic Oligomers

et al. 2018

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We investigate collective effects in plasmonic oligomers of different symmetries using second-harmonic generation (SHG) microscopy with cylindrical vector beams (CVBs). The oligomers consist of gold nanorods that have a longitudinal plasmon resonance close to the fundamental wavelength that is used for SHG excitation and whose long axes are arranged locally such that they follow the distribution of the transverse component of the electric field of radially or azimuthally polarized CVBs in the focal plane. We observe that SHG from such rotationally symmetric oligomers is strongly modified by the interplay between the polarization properties of the CVB and interparticle coupling. We find that the oligomers with radially oriented nanorods exhibit small coupling effects. In contrast, we find that the oligomers with azimuthally oriented nanorods exhibit large coupling effects that lead to silencing of SHG from the whole structure. Our experimental results are in very good agreement with numerical calculations based on the boundary element method. The work describes a new route for studying coupling effects in complex arrangements of nano-objects and thereby for tailoring the efficiency of nonlinear optical effects in such structures.

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“…Metals were among the first exploited nanoscale materials to obtain strong optical nonlinear responses [5][6][7][8][9][10][11][18][19][20][21][22][23][24][25] . Metallic nanostructures represent an interesting approach to bridge the gap between conventional and modern optics.…”

Section: Metallic Nanoantennasmentioning

confidence: 99%

“…Metallic nanostructures represent an interesting approach to bridge the gap between conventional and modern optics. Such nanostructures stimulate the oscillation of free electrons on the surface, so-called surface plasmons [5][6][7][8][9][10][11][18][19][20][21][22][23][26][27][28][29][30][31][32] that lead to strong near-field enhancements known as hot-spots that boost both linear and nonlinear characteristics 9,[33][34][35][36][37][38] . Indeed, employing surface plasmons arising at metal-dielectric boundaries allows enhancing nonlinear interactions, because electrons at the surface reside in a non-symmetric environment, where the nonlinearities arise from the asymmetry of the potential confining the electrons at the surface 2,3 .…”

Section: Metallic Nanoantennasmentioning

confidence: 99%

Nonlinear frequency conversion in optical nanoantennas and metasurfaces: materials evolution and fabrication

Rahmani¹,

Leo²,

Brener³

et al. 2018

Opto-Electronic Advances

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Nonlinear frequency conversion is one of the most fundamental processes in nonlinear optics. It has a wide range of applications in our daily lives, including novel light sources, sensing, and information processing. It is usually assumed that nonlinear frequency conversion requires large crystals that gradually accumulate a strong effect. However, the large size of nonlinear crystals is not compatible with the miniaturisation of modern photonic and optoelectronic systems. Therefore, shrinking the nonlinear structures down to the nanoscale, while keeping favourable conversion efficiencies, is of great importance for future photonics applications. In the last decade, researchers have studied the strategies for enhancing the nonlinear efficiencies at the nanoscale, e.g. by employing different nonlinear materials, resonant couplings and hybridization techniques. In this paper, we provide a compact review of the nanomaterials-based efforts, ranging from metal to dielectric and semiconductor nanostructures, including their relevant nanofabrication techniques.

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Nonlinear Symmetry Breaking in Symmetric Oligomers

Cited by 33 publications

References 59 publications

Reversible Thermal Tuning of All‐Dielectric Metasurfaces

Reversible Thermal Tuning of All‐Dielectric Metasurfaces

Collective Effects in Second-Harmonic Generation from Plasmonic Oligomers

Nonlinear frequency conversion in optical nanoantennas and metasurfaces: materials evolution and fabrication

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