Water: Promising Opportunities For Tunable All-dielectric Electromagnetic Metamaterials

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Abstract

We reveal an outstanding potential of water as an inexpensive, abundant and bio-friendly high-refractive-index material for creating tunable all-dielectric photonic structures and metamaterials. Specifically, we demonstrate thermal, mechanical and gravitational tunability of magnetic and electric resonances in a metamaterial consisting of periodically positioned water-filled reservoirs. The proposed water-based metamaterials can find applications not only as cheap and ecological microwave devices, but also in optical and terahertz metamaterials prototyping and educational lab equipment.

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High-frequency, scaled graphene transistors on diamond-like carbon.

Yanqing Wu, Yu-ming Lin, Ageeth A Bol … (2011)

Owing to its high carrier mobility and saturation velocity, graphene has attracted enormous attention in recent years. In particular, high-performance graphene transistors for radio-frequency (r.f.) applications are of great interest. Synthesis of large-scale graphene sheets of high quality and at low cost has been demonstrated using chemical vapour deposition (CVD) methods. However, very few studies have been performed on the scaling behaviour of transistors made from CVD graphene for r.f. applications, which hold great potential for commercialization. Here we report the systematic study of top-gated CVD-graphene r.f. transistors with gate lengths scaled down to 40 nm, the shortest gate length demonstrated on graphene r.f. devices. The CVD graphene was grown on copper film and transferred to a wafer of diamond-like carbon. Cut-off frequencies as high as 155 GHz have been obtained for the 40-nm transistors, and the cut-off frequency was found to scale as 1/(gate length). Furthermore, we studied graphene r.f. transistors at cryogenic temperatures. Unlike conventional semiconductor devices where low-temperature performance is hampered by carrier freeze-out effects, the r.f. performance of our graphene devices exhibits little temperature dependence down to 4.3 K, providing a much larger operation window than is available for conventional devices. ©2011 Macmillan Publishers Limited. All rights reserved

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Graphene metamaterials based tunable terahertz absorber: effective surface conductivity approach.

Andrei Andryieuski, Andrei Lavrinenko (2013)

In this paper we present the efficient design of functional thin-film metamaterial devices with the effective surface conductivity approach. As an example, we demonstrate a graphene based perfect absorber. After formulating the requirements to the perfect absorber in terms of surface conductivity we investigate the properties of graphene wire medium and graphene fishnet metamaterials and demonstrate both narrowband and broadband tunable absorbers.

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Magnetic and electric hotspots with silicon nanodimers.

Reuben Bakker, Dmitry Permyakov, Ye Yu … (2015)

The study of the resonant behavior of silicon nanostructures provides a new route for achieving efficient control of both electric and magnetic components of light. We demonstrate experimentally and numerically that enhancement of localized electric and magnetic fields can be achieved in a silicon nanodimer. For the first time, we experimentally observe hotspots of the magnetic field at visible wavelengths for light polarized across the nanodimer's primary axis, using near-field scanning optical microscopy.

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Author and article information

Journal

Journal ID (nlm-ta): Sci Rep

Journal ID (iso-abbrev): Sci Rep

Title: Scientific Reports

Publisher: Nature Publishing Group

ISSN (Electronic): 2045-2322

Publication date (Electronic): 27 August 2015

Publication date Collection: 2015

Volume: 5

Electronic Location Identifier: 13535

Affiliations

[1 ]DTU Fotonik, Technical University of Denmark , Ørsteds Plads 343, DK-2800 Kgs. Lyngby, Denmark

[2 ]Radiophysics Department, University of Nizhny Novgorod , Nizhny Novgorod 603950, Russia

[3 ]ITMO University , St. Petersburg 197101, Russia

[4 ]Nonlinear Physics Center, Australian National University , Canberra ACT 0200, Australia

Author notes

[a ] andra@ 123456fotonik.dtu.dk

[*]

These authors contributed equally to this work.

Article

Publisher Item ID: srep13535

DOI: 10.1038/srep13535

PMC ID: 4550894

PubMed ID: 26311410

SO-VID: a9e5c96b-7a0c-4da9-b7b8-79c4701e885b

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This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

Water: Promising Opportunities For Tunable All-dielectric Electromagnetic Metamaterials

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Most cited references 10

High-frequency, scaled graphene transistors on diamond-like carbon.

Graphene metamaterials based tunable terahertz absorber: effective surface conductivity approach.

Magnetic and electric hotspots with silicon nanodimers.

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