Dynamically reconfigurable metal-semiconductor Yagi-Uda nanoantenna

Savelev, Roman S.; Sergaeva, Olga; Baranov, Denis G.; Krasnok, Alex; Alù, Andrea

doi:10.1103/physrevb.95.235409

Cited by 21 publications

(19 citation statements)

References 44 publications

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“…By using f = 0.4 and a blueshift of 140 nm, and f = 0.65 and a blueshift of 90 nm, we obtain the best matching of simulated scattering peaks with experimental data of a-Si:H NP(40) (radius of~185 nm), a-Si:H NP(20) (radius of~160 nm), and a-Si:H NP(10) (radius of 207 nm), respectively. The optical response of fabricated spherical a-Si:H NPs with dielectric permittivity ε a-Si:H and radius R are calculated by the Mie light scattering theory 72,73 , which gives the following expression for normalized SCS for particles made of a nonmagnetic material:…”

Section: Resultsmentioning

confidence: 99%

“…Analytical and numerical simulations. The optical response of a Si nanoparticle with dielectric permittivity ε = n 2 (n is the refractive index of the nanoparticle material) and a radius R located in the free space can be treated via Mie light scattering theory 72,73 , which gives the following expression for normalized scattering [Q sct ¼ P sct =ðπR 2 IÞ] cross section for particles made of a nonmagnetic material:…”

Section: Discussionmentioning

confidence: 99%

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Suppressing material loss in the visible and near-infrared range for functional nanophotonics using bandgap engineering

Wang¹,

Krasnok²,

Lepeshov³

et al. 2020

Nat Commun

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All-dielectric nanostructures have recently opened exciting opportunities for functional nanophotonics, owing to their strong optical resonances along with low material loss in the near-infrared range. Pushing these concepts to the visible range is hindered by their larger absorption coefficient, thus encouraging the search for alternative dielectrics for nanophotonics. Here, we employ bandgap engineering to synthesize hydrogenated amorphous Si nanoparticles (a-Si:H NPs) offering ideal features for functional nanophotonics. We observe significant material loss suppression in a-Si:H NPs in the visible range caused by hydrogenation-induced bandgap renormalization, producing strong higher-order resonant modes in single NPs with Q factors up to ~100 in the visible and near-IR range. We also realize highly tunable all-dielectric meta-atoms by coupling a-Si:H NPs to photochromic spiropyran molecules. ~70% reversible all-optical tuning of light scattering at the higher-order resonant mode under a low incident light intensity is demonstrated. Our results promote the development of high-efficiency visible nanophotonic devices.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Suppressing material loss in the visible and near-infrared range for functional nanophotonics using bandgap engineering

Wang¹,

Krasnok²,

Lepeshov³

et al. 2020

Nat Commun

Self Cite

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“…Because of their distinct properties, RDNs have been proposed for high‐harmonic generation, photonic topological insulators, boosting the luminescence from quantum emitters such as NV‐centers in nanodiamonds, quantum dots, perovskites, dye molecules, and carbon nanotubes . In addition, resonant dielectric nanostructures have been used for scattering engineering, ultrafast switchers and modulators, optical interconnections on a chip, light trapping structures, colored metasurfaces, and enhanced Raman scattering . Interesting photonic phenomena such as Fano resonances, Purcell effect, and strong coupling have been shown in dielectric nanostructures as well.…”

Section: Introductionmentioning

confidence: 99%

Spectroscopy and Biosensing with Optically Resonant Dielectric Nanostructures

Krasnok

Caldarola

Bonod

et al. 2018

Advanced Optical Materials

131

123

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Resonant dielectric nanoparticles made of materials with large positive dielectric permittivity, such as Si, GaP, GaAs, have become a powerful platform for modern light science, enabling various fascinating applications in nanophotonics and quantum optics. In addition to light localization at the nanoscale, dielectric nanostructures provide electric and magnetic resonant responses throughout the visible and infrared spectrum, low dissipative losses and optical heating, low doping effect, and absence of quenching, which are interesting for spectroscopy and biosensing applications. This review presents state‐of‐the‐art applications of optically resonant high‐index dielectric nanostructures as a multifunctional platform for light–matter interactions. Nanoscale control of quantum emitters and applications for enhanced spectroscopy including fluorescence spectroscopy, surface‐enhanced Raman scattering, biosensing, and lab‐on‐a‐chip technology are surveyed. The theoretical background underlying these effects is described, realizations of specific resonant dielectric nanostructures and hybrid excitonic systems are overviewed, and an outlook of the challenges in this field, which remain open to future research, is provided.

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“… 13 . In particular, by changing the relative size of the core respect to the particle size, it is possible to tune the spectral position of the electric and magnetic resonances and consequently, to govern the above mentioned SDCs 22 , 23 . These nanostructures can have applications in solar energy harvesting devices 24 – 26 , metamaterials 27 or sensing 22 , among others.…”

Section: Introductionmentioning

confidence: 99%

Light guiding and switching using eccentric core-shell geometries

Barreda

Gutiérrez

Sanz

et al. 2017

Sci Rep

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High Refractive Index (HRI) dielectric nanoparticles have been proposed as an alternative to metallic ones due to their low absorption and magnetodielectric response in the VIS and NIR ranges. For the latter, important scattering directionality effects can be obtained. Also, systems constituted by dimers of HRI dielectric nanoparticles have shown to produce switching effects by playing with the polarization, frequency or intensity of the incident radiation. Here, we show that scattering directionality effects can be achieved with a single eccentric metallo-HRI dielectric core-shell nanoparticle. As an example, the effect of the metallic core displacements for a single Ag-Si core-shell nanoparticle has been analyzed. We report rotation of the main scattering lobe either clockwise or counterclockwise depending on the polarization of the incident radiation leading to new scattering configurations for switching purposes. Also, the efficiency of the scattering directionality can be enhanced. Finally, chains of these scattering units have shown good radiation guiding effects, and for 1D periodic arrays, redirection of diffracted intensity can be observed as a consequence of blazing effects. The proposed scattering units constitute new blocks for building systems for optical communications, solar energy harvesting devices and light guiding at the nanoscale level.

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Dynamically reconfigurable metal-semiconductor Yagi-Uda nanoantenna

Cited by 21 publications

References 44 publications

Suppressing material loss in the visible and near-infrared range for functional nanophotonics using bandgap engineering

Suppressing material loss in the visible and near-infrared range for functional nanophotonics using bandgap engineering

Spectroscopy and Biosensing with Optically Resonant Dielectric Nanostructures

Light guiding and switching using eccentric core-shell geometries

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