Maria Timofeeva

We fabricate hybrid nanodimers made of gold and barium titanate nanoparticles by a pick-and-place technique. By overlapping their resonances, we achieve 100-times enhancement of the second-harmonic signal at the hybridized mode while reshaping its polarization. © 2019 The Author(s)

Barium titanate

Harmonic Analysis

10.23919/cleo.2019.8749650

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Switching Second-Harmonic Forward to Backward Emission via GaAs Nanoantennas

Conference on Lasers and Electro-Optics (2020)

Lei Xu Grégoire Saerens Maria Timofeeva Daria A. Smirnova Irina Volkovskaya

Switching forward-to-backward linear scattering of nanoantennas is a process of major importance. Here, we demonstrate the first nonlinear switching of forward to backward second harmonic generation, via engineering the nonlinear-tensors of the (110)-GaAs nanoantennas.

Harmonic

Harmonic Analysis

10.1364/cleo_si.2020.sw3n.2

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Photovoltaic properties of GaAs:Be nanowire arrays

Semiconductors (2013)

A. D. Bouravleuv Daria V. Beznasyuk E. P. Gilstein Maria Tchernycheva Andrés de Luna Bugallo

10.1134/s1063782613060079

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Anapoles in Free-Standing III–V Nanodisks Enhancing Second-Harmonic Generation

Nano Letters (2018)

Maria Timofeeva Lukas Lang Flavia Timpu Claude Renaut A. D. Bouravleuv

Nonradiating electromagnetic configurations in nanostructures open new horizons for applications due to two essential features: lack of energy losses and invisibility to the propagating electromagnetic field. Such radiationless configurations form a basis for new types of nanophotonic devices, where a strong electromagnetic field confinement can be achieved together with lossless interactions between nearby components. In our work, we present a new design of free-standing disk nanoantennas with nonradiating current distributions for the optical near-infrared range. We show a novel approach to create nanoantennas by slicing III-V nanowires into standing disks using focused ion beam milling. We experimentally demonstrate the suppression of the far-field radiation and the associated strong enhancement of the second-harmonic generation from the disk nanoantennas. With a theoretical analysis of the electromagnetic field distribution using multipole expansions in both spherical and Cartesian coordinates, we confirm that the demonstrated nonradiating configurations are anapoles. We expect that the presented procedure to design and produce disk nanoantennas from nanowires become one of standard approaches to fabricate controlled chains of standing nanodisks with different designs and configurations. These chains can be an essential building blocks for new types of lasers and sensors with low power consumption.

Nanophotonics

10.1021/acs.nanolett.8b00830

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Citations (124)

Anapoles in Disk Nanoantennas Fabricated from III-V Nanowires for Enhancement Second Harmonic Generation

Maria Timofeeva Lukas Lang Claude Renaut Flavia Timpu I. V. Shtrom

Harmonic

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Réflexions sur une électronique analogique de courant : super transistor OPA86X et amplificateur direct à transimpédance à base de GMR

HAL (Le Centre pour la Communication Scientifique Directe) (2011)