Nonlinear Transient Dynamics of Photoexcited Silicon Nanoantenna for Ultrafast All-Optical Signal Processing

Baranov, Denis G.; Makarov, Sergey; Milichko, Valentin A.; Kudryashov, S. I.; Krasnok, Alex; Belov, Pavel A.

doi:10.48550/arxiv.1603.04397

Cited by 3 publications

(7 citation statements)

References 29 publications

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“…Both these electric and magnetic resonances can be spectrally controlled and engineered independently, and therefore all-dielectric nanostructures offer unique opportunities for the study of nonlinear effects owing to low losses in combination with multipolar optical response of both electric and magnetic nature. Utilizing the Mie-type resonances in resonant subwavelength dielectric geometries has been recently recongnized a promising strategy to gain high efficiencies of nonlinear processes at low mode volumes and design novel functionalities originating from the opticallyinduced magnetic response [47,[172][173][174][175][176][177][178][179][180][181][182][183][184][185]. Particularly, optically magnetic dielectric nanostructures are shown to significantly enhance nonlinear conversion, with the high enhancement observed for excitation of the magnetic dipole resonance.…”

Section: All-dielectric Nanostructuresmentioning

confidence: 99%

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Multipolar nonlinear nanophotonics

Smirnova

Kivshar

2016

Optica

331

282

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Nonlinear nanophotonics is a rapidly developing field with many useful applications for a design of nonlinear nanoantennas, light sources, nanolasers, sensors, and ultrafast miniature metadevices. A tight confinement of the local electromagnetic fields in resonant photonic nanostructures can boost nonlinear optical effects, thus offering versatile opportunities for subwavelength control of light. To achieve the desired functionalities, it is essential to gain flexible control over the near-and far-field properties of nanostructures. Thus, both modal and multipolar analyses are widely exploited for engineering nonlinear scattering from resonant nanoscale elements, in particular for enhancing the near-field interaction, tailoring the far-field multipolar interference, and optimization of the radiation directionality. Here, we review the recent advances in this recently emerged research field ranging from metallic structures exhibiting localized plasmonic resonances to hybrid metal-dielectric and alldielectric nanostructures driven by Mie-type multipolar resonances and optically-induced magnetic response.

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Section: All-dielectric Nanostructuresmentioning

confidence: 99%

“…Later, accelerated reconfiguration of a radiation pattern from dipole-like to unidirectional (Huygens-source scattering) regime mediated by ultrafast (with times scales of about 2.5 ps) generation of electron-hole plasma during laser pulse-nanoantenna interaction was described in Ref. [183].…”

Section: All-dielectric Nanostructuresmentioning

confidence: 99%

Multipolar nonlinear nanophotonics

Smirnova

Kivshar

2016

Optica

331

282

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“…Incident optical pulse enables photoexcitation of EHP within nanoparticles affecting their optical resonances and therefore scattering behavior. Silicon (Si) is chosen as a high-index material due to its high two-photon absorption at optical frequencies resulting in efficient EHP excitation [25]. On the other hand, germanium (Ge) may become the optimal choice in the near-IR due to its attractive nonlinear properties.…”

Section: Modelmentioning

confidence: 99%

“…In order to simulate nonlinear scattering of an optical pulse we adopt our analytical model developed in Ref. [25]. Each spherical nanoparticle is modeled as a combination of electric (p) and magnetic (m) dipole moments.…”

Section: Modelmentioning

confidence: 99%

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Tuning of near‐ and far‐field properties of all‐dielectric dimer nanoantennas via ultrafast electron‐hole plasma photoexcitation

Baranov

Makarov

Krasnok

et al. 2016

Laser & Photonics Reviews

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Achievement of all-optical ultrafast signal modulation and routing by a low-loss nanodevice is a crucial step towards an ultracompact optical chip with high performance. Here, we propose a specifically designed silicon dimer nanoantenna, which is tunable via photoexcitation of dense electron-hole plasma with ultrafast relaxation rate. Basing on this concept, we demonstrate the effect of beam steering up to 20 degrees via simple variation of incident intensity, being suitable for ultrafast light routing in an optical chip. The effect is demonstrated both in the visible and near-IR spectral regions for silicon and germanium based nanoantennas. We also reveal the effect of electron-hole plasma photoexcitation on local density of states (LDOS) in the dimer gap and find that the orientation averaged LDOS can be altered by 50%, whereas modification of the projected LDOS can be even more dramatic almost 500% for transverse dipole orientation. Moreover, our analytical model sheds light on transient dynamics of the studied nonlinear nanoantennas, yielding all temporal characteristics of the proposed ultrafast nanodevice. The proposed concept paves the ways to creation of low-loss, ultrafast, and compact devices for optical signal modulation and routing.

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