Ultraviolet and visible plasmonic metamaterials made of topological insulator
Ultraviolet and visible plasmonic metamaterials made of topological insulator
We provide the first demonstration of plasmonic metamaterials made of a semiconducting material, Bi1.5Sb0.5Te1.8Se1.2 (BSTS), which is also known as a topological insulator, working at the UV and visible frequencies where finding a good plasmonic material is extremely challenging. Spectroscopic ellipsometry of the material revealed the existence of negative permittivity in the wavelengths 200 – 670 nm, which is rarely seen at the first absorption edge of semiconductors in nature. The negative permittivity is attributed to the combination of bulk interband transitions and surface contribution of the topologically protected states. Metamaterials fabricated from the BSTS crystal show plasmonic resonances from 350 nm to 550 nm while surface gratings exhibit cathodoluminescence peaks from 230 nm to 1050 nm. This finding of new class of materials with high-frequency plasmonic response could advance plasmonics in view of merging plasmonic functionality with electronics thanks to the nature of the material.
Ou, J-Y.
3fb703e3-b222-46d2-b4ee-75f296d9d64d
So, J.K.
06a7afea-61c2-439d-9ac4-047ea21a909b
Adamo, G.
73480dbd-5d3e-415a-b569-9606b3dbeecc
Sulaev, A.
7a6e7d91-7586-453c-8956-8c07f430d996
Wang, L.
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Zheludev, N.I.
32fb6af7-97e4-4d11-bca6-805745e40cc6
2014
Ou, J-Y.
3fb703e3-b222-46d2-b4ee-75f296d9d64d
So, J.K.
06a7afea-61c2-439d-9ac4-047ea21a909b
Adamo, G.
73480dbd-5d3e-415a-b569-9606b3dbeecc
Sulaev, A.
7a6e7d91-7586-453c-8956-8c07f430d996
Wang, L.
ff28fc9d-dbeb-460f-943c-f49997f58bf7
Zheludev, N.I.
32fb6af7-97e4-4d11-bca6-805745e40cc6
Ou, J-Y., So, J.K., Adamo, G., Sulaev, A., Wang, L. and Zheludev, N.I.
(2014)
Ultraviolet and visible plasmonic metamaterials made of topological insulator.
Photon '14, London, London, United Kingdom.
01 - 04 Sep 2014.
Record type:
Conference or Workshop Item
(Paper)
Abstract
We provide the first demonstration of plasmonic metamaterials made of a semiconducting material, Bi1.5Sb0.5Te1.8Se1.2 (BSTS), which is also known as a topological insulator, working at the UV and visible frequencies where finding a good plasmonic material is extremely challenging. Spectroscopic ellipsometry of the material revealed the existence of negative permittivity in the wavelengths 200 – 670 nm, which is rarely seen at the first absorption edge of semiconductors in nature. The negative permittivity is attributed to the combination of bulk interband transitions and surface contribution of the topologically protected states. Metamaterials fabricated from the BSTS crystal show plasmonic resonances from 350 nm to 550 nm while surface gratings exhibit cathodoluminescence peaks from 230 nm to 1050 nm. This finding of new class of materials with high-frequency plasmonic response could advance plasmonics in view of merging plasmonic functionality with electronics thanks to the nature of the material.
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Published date: 2014
Venue - Dates:
Photon '14, London, London, United Kingdom, 2014-09-01 - 2014-09-04
Organisations:
Optoelectronics Research Centre
Identifiers
Local EPrints ID: 375894
URI: http://eprints.soton.ac.uk/id/eprint/375894
PURE UUID: ac3b6c14-4fad-4d21-8eee-fa3b8d0a4d3b
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Date deposited: 17 Apr 2015 13:52
Last modified: 06 Mar 2024 02:46
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Contributors
Author:
J-Y. Ou
Author:
J.K. So
Author:
G. Adamo
Author:
A. Sulaev
Author:
L. Wang
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