Ultraviolet and visible range plasmonics in the topological insulator Bi1.5Sb0.5Te1.8Se1.2
Ultraviolet and visible range plasmonics in the topological insulator Bi1.5Sb0.5Te1.8Se1.2
The development of metamaterials, data processing circuits and sensors for the visible and ultraviolet parts of the spectrum is hampered by the lack of low-loss media supporting plasmonic excitations. This has driven the intense search for plasmonic materials beyond noble metals. Here we show that the semiconductor Bi1.5Sb0.5Te1.8Se1.2, also known as a topological insulator, is also a good plasmonic material in the blue-ultraviolet range, in addition to the already-investigated terahertz frequency range. Metamaterials fabricated from Bi1.5Sb0.5Te1.8Se1.2 show plasmonic resonances from 350 to 550nm, while surface gratings exhibit cathodoluminescent peaks from 230 to 1,050nm. The observed plasmonic response is attributed to the combination of bulk charge carriers from interband transitions and surface charge carriers of the topological insulator. The importance of our result is in the identification of new mechanisms of negative permittivity in semiconductors where visible range plasmonics can be directly integrated with electronics.
Ou, Jun-Yu
3fb703e3-b222-46d2-b4ee-75f296d9d64d
So, Jin-Kyu
06a7afea-61c2-439d-9ac4-047ea21a909b
Adamo, Giorgio
73480dbd-5d3e-415a-b569-9606b3dbeecc
Sulaev, Azat
b170168c-6866-4bc5-8f1f-b546f29961ca
Wang, Lan
911bead6-693d-4ffe-a125-cc3aeb8bb10a
Zheludev, Nikolay I.
32fb6af7-97e4-4d11-bca6-805745e40cc6
8 October 2014
Ou, Jun-Yu
3fb703e3-b222-46d2-b4ee-75f296d9d64d
So, Jin-Kyu
06a7afea-61c2-439d-9ac4-047ea21a909b
Adamo, Giorgio
73480dbd-5d3e-415a-b569-9606b3dbeecc
Sulaev, Azat
b170168c-6866-4bc5-8f1f-b546f29961ca
Wang, Lan
911bead6-693d-4ffe-a125-cc3aeb8bb10a
Zheludev, Nikolay I.
32fb6af7-97e4-4d11-bca6-805745e40cc6
Ou, Jun-Yu, So, Jin-Kyu, Adamo, Giorgio, Sulaev, Azat, Wang, Lan and Zheludev, Nikolay I.
(2014)
Ultraviolet and visible range plasmonics in the topological insulator Bi1.5Sb0.5Te1.8Se1.2.
Nature Communications, 5, [5139].
(doi:10.1038/ncomms6139).
Abstract
The development of metamaterials, data processing circuits and sensors for the visible and ultraviolet parts of the spectrum is hampered by the lack of low-loss media supporting plasmonic excitations. This has driven the intense search for plasmonic materials beyond noble metals. Here we show that the semiconductor Bi1.5Sb0.5Te1.8Se1.2, also known as a topological insulator, is also a good plasmonic material in the blue-ultraviolet range, in addition to the already-investigated terahertz frequency range. Metamaterials fabricated from Bi1.5Sb0.5Te1.8Se1.2 show plasmonic resonances from 350 to 550nm, while surface gratings exhibit cathodoluminescent peaks from 230 to 1,050nm. The observed plasmonic response is attributed to the combination of bulk charge carriers from interband transitions and surface charge carriers of the topological insulator. The importance of our result is in the identification of new mechanisms of negative permittivity in semiconductors where visible range plasmonics can be directly integrated with electronics.
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Accepted/In Press date: 3 September 2014
e-pub ahead of print date: 8 October 2014
Published date: 8 October 2014
Organisations:
Optoelectronics Research Centre
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Local EPrints ID: 372192
URI: http://eprints.soton.ac.uk/id/eprint/372192
PURE UUID: 5b85c138-b3a8-4a06-925b-8e3e8368812a
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Date deposited: 02 Dec 2014 12:05
Last modified: 15 Mar 2024 03:39
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Author:
Jun-Yu Ou
Author:
Jin-Kyu So
Author:
Giorgio Adamo
Author:
Azat Sulaev
Author:
Lan Wang
Author:
Nikolay I. Zheludev
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