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

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Title: Anapoles in Free-Standing III-V Nanodisks Enhancing Second-Harmonic Generation.
Authors: Timofeeva, Maria1 mtimo@phys.ethz.ch, Lang, Lukas1, Timpu, Flavia1, Renaut, Claude1, Bouravleuv, Alexei2, Shtrom, Igor2, Cirlin, George3, Grange, Rachel1 grange@phys.ethz.ch
Source: Nano Letters. 6/13/2018, Vol. 18 Issue 6, p3695-3702. 8p.
Subjects: Nanostructures, Energy dissipation, Electromagnetic fields, Optical antennas, Ion beams, Energy consumption
Abstract: Nonradiating electromagnetic configurations in nanostructures open new horizons for applications due to two essential features: a lack of energy losses and invisibility to the propagating electromagnetic field. Such radiationless configurations form a basis for new types of nanophotonic devices, in which 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 creating 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 of designing and producing disk nanoantennas from nanowires becomes one of the standard approaches to fabricating controlled chains of standing nanodisks with different designs and configurations. These chains can be essential building blocks for new types of lasers and sensors with low power consumption. [ABSTRACT FROM AUTHOR]
Copyright of Nano Letters is the property of American Chemical Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: <searchLink fieldCode="AR" term="%22Timofeeva%2C+Maria%22">Timofeeva, Maria</searchLink><relatesTo>1</relatesTo><i> mtimo@phys.ethz.ch</i><br /><searchLink fieldCode="AR" term="%22Lang%2C+Lukas%22">Lang, Lukas</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Timpu%2C+Flavia%22">Timpu, Flavia</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Renaut%2C+Claude%22">Renaut, Claude</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Bouravleuv%2C+Alexei%22">Bouravleuv, Alexei</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Shtrom%2C+Igor%22">Shtrom, Igor</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Cirlin%2C+George%22">Cirlin, George</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Grange%2C+Rachel%22">Grange, Rachel</searchLink><relatesTo>1</relatesTo><i> grange@phys.ethz.ch</i>
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  Data: <searchLink fieldCode="JN" term="%22Nano+Letters%22">Nano Letters</searchLink>. 6/13/2018, Vol. 18 Issue 6, p3695-3702. 8p.
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  Data: Nonradiating electromagnetic configurations in nanostructures open new horizons for applications due to two essential features: a lack of energy losses and invisibility to the propagating electromagnetic field. Such radiationless configurations form a basis for new types of nanophotonic devices, in which 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 creating 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 of designing and producing disk nanoantennas from nanowires becomes one of the standard approaches to fabricating controlled chains of standing nanodisks with different designs and configurations. These chains can be essential building blocks for new types of lasers and sensors with low power consumption. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Nano Letters is the property of American Chemical Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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              Text: 6/13/2018
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