Optical generation of intense ultrashort magnetic pulses at the nanoscale

Tsiatmas, A.; Atmatzakis, Evangelos; Papasimakis, Nikitas; Fedotov, V.A.; Luk’yanchuk, Boris; Zheludev, Nikolay I.; Abajo, F. Javier García de

doi:10.1088/1367-2630/15/11/113035

Cited by 21 publications

(29 citation statements)

References 32 publications

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“…We expect bimetallic metamaterials to find applications in refractive index and magnetic field sensing, as well as in compact active components for integrated nanophotonic circuits. In addition, this design has been shown to support transient thermoelectric currents that give rise to magnetic pulses [18,19].…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, changing the wavelength or polarization of the incident light allows one to shift the area of light confinement along the resonator and thus control the MO response. Finally, our approach is based on continuous metallic nanostructures and enables not only to realize complex resonators with prescribed MO and plasmonic response but also to exploit other types of physical response involving thermal and electric effects [18,19].…”

Section: Introductionmentioning

confidence: 99%

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Magneto-optical response in bimetallic metamaterials

et al. 2017

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Abstract:We demonstrate resonant Faraday polarization rotation in plasmonic arrays of bimetallic nano-ring resonators consisting of Au and Ni sections. This metamaterial design allows the optimization of the trade-off between the enhancement of magneto-optical effects and plasmonic dissipation. Nickel sections corresponding to as little as ~6% of the total surface of the metamaterial result in magneto-optically induced polarization rotation equal to that of a continuous nickel film. Such bimetallic metamaterials can be used in compact magnetic sensors, active plasmonic components, and integrated photonic circuits.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Magneto-optical response in bimetallic metamaterials

et al. 2017

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“…Such hybrid systems combine the strong local fields at the plasmonic resonance with the magneto-optical response of ferromagnetic layers leading to magnetic control of the plasmonic response or vice-versa [1,2]. Here we demonstrate direct integration of magneto-optical materials in metamaterial resonators leading to an order of magnitude enhancement of the polar magneto-optical Kerr effect (MOKE).…”

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confidence: 92%

Giant Kerr Rotation Enhancement in Magneto-plasmonic Metamaterials

et al. 2014

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Abstract:We report for the first time an order of magnitude enhancement of Kerr rotation in hybrid plasmonic/ferromagnetic metamaterial resonators. Our results pave the way towards magnetically controlled metamaterials and integrated magneto-plasmonics. Interfacing plasmonic and magneto-optical materials has recently emerged as a promising approach towards active nanoscale optical elements with significant technological implications: optical isolators, modulators, data storage, sensing, imaging, therapy. Such hybrid systems combine the strong local fields at the plasmonic resonance with the magneto-optical response of ferromagnetic layers leading to magnetic control of the plasmonic response or vice-versa [1,2]. Here we demonstrate direct integration of magneto-optical materials in metamaterial resonators leading to an order of magnitude enhancement of the polar magneto-optical Kerr effect (MOKE).The system under study is a periodic array of bi-metallic Au/Ni plasmonic ring resonators, where the gold part provides a strong plasmonic response, while the nickel section is responsible for the magneto-optical effects. Taking into account the high losses of Ni which damp the plasmonic response of the resonators, as well as current manufacturing and measuring limitations, we fix the composition of the rings to ¾ Au and ¼ Ni (see Fig. 1a). The sample was fabricated by a multi-step procedure comprising e-beam lithography, film evaporation, and lift-off processes. The manufactured sample consists of bi-metallic rings with a mean diameter of 200 nm and a cross-section of 50x50 nm 2 . The unit cell is 400x400 nm 2 , while the overall size of the array is 100x100 µm 2 . Polarization azimuth rotation spectra due to the polar magneto-optical Kerr effect in the presence of a BDC=200 mT external magnetic field. Blue points correspond to a 50 nm thick Ni film and red to the bimetallic metamaterial array. Lines serve as guides for the eye. Inset: Numerically simulated electric field map of the metamaterial unit cell at resonance.

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“…For this discovery Seebeck formed a bimetallic loop, and while heating up one of the junctions with a lamp, he observed the deflection of a compass needle nearby. The design proposed in [1] adopts a similar geometry albeit on a much smaller scale and the lamp is replaced with a laser. This scaling down is important for excitation of plasmonic resonances [1,14] and results in nanoscale confinement of the magnetic field.…”

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Novel layout of a bi-metallic nanoring for magnetic field pulse generation from light

et al. 2015

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Recently Tsiatmas et al proposed using a nanoring made of two different metallic sectors to generate a magnetic pulse from a laser pulse [1]. Non-uniform heating of the ring creates very large temperature gradients, which drive thermoelectric currents, and this creates a localized magnetic field. However, heat from the laser pulse may result in the melting of the nanoring. We propose a symmetric structure made of four metallic sectors, which results in a higher magnetic field generation together with a lower lattice temperature. We also show that the magnetic field depends strongly on the size of the metallic sectors and interpret the results with the help of the electromotive forces, the overall ring resistance, and Biot-Savart law.

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Optical generation of intense ultrashort magnetic pulses at the nanoscale

Cited by 21 publications

References 32 publications

Magneto-optical response in bimetallic metamaterials

Magneto-optical response in bimetallic metamaterials

Giant Kerr Rotation Enhancement in Magneto-plasmonic Metamaterials

Novel layout of a bi-metallic nanoring for magnetic field pulse generation from light

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