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Terahertz metamaterial with asymmetric transmission

Terahertz metamaterial with asymmetric transmission
Terahertz metamaterial with asymmetric transmission
We show that a planar metamaterial, an array of coupled metal split-ring resonators with a unit cell lacking mirror symmetry, exhibits asymmetric transmission of terahertz radiation (0.25-2.5 THz) propagating through it in opposite directions. This intriguing effect, that is compatible with Lorentz reciprocity and time-reversal, depends on a directional difference in conversion efficiency of the incident circularly polarized wave into one of opposite handedness, that is only possible in lossy low-symmetry planar chiral metamaterials. We show that asymmetric transmission is linked to excitation of enantiomerically sensitive plasmons, these are induced charge-field excitations that depend on the mutual handedness of incident wave and metamaterial pattern. Various bands of positive, negative and zero phase and group velocities have been identified indicating the opportunity to develop polarization sensitive negative index and slow light media based on such metamaterials.
1550-235X
Singh, R.
d1445d2a-9cb7-4425-af69-b68bd2ac5575
Plum, E.
50761a26-2982-40df-9153-7aecc4226eb5
Menzel, C.
53b11fd7-ad79-4adb-a5f4-c17eb9648c49
Rockstuhl, C.
4159eb9f-ee90-4f77-a249-d6082ce43df4
Azad, A.K.
f5764645-c82a-439a-8f72-6cb36fde67d6
Cheville, R.A.
35724d39-96f3-4451-96a1-c72a8d5c89bc
Lederer, F.
a412de45-746f-4738-928b-4ab120e43d8c
Zhang, W.
1c80d4f2-4ba8-41f6-85a6-a76a4d65dc9b
Zheludev, N.I.
32fb6af7-97e4-4d11-bca6-805745e40cc6
Singh, R.
d1445d2a-9cb7-4425-af69-b68bd2ac5575
Plum, E.
50761a26-2982-40df-9153-7aecc4226eb5
Menzel, C.
53b11fd7-ad79-4adb-a5f4-c17eb9648c49
Rockstuhl, C.
4159eb9f-ee90-4f77-a249-d6082ce43df4
Azad, A.K.
f5764645-c82a-439a-8f72-6cb36fde67d6
Cheville, R.A.
35724d39-96f3-4451-96a1-c72a8d5c89bc
Lederer, F.
a412de45-746f-4738-928b-4ab120e43d8c
Zhang, W.
1c80d4f2-4ba8-41f6-85a6-a76a4d65dc9b
Zheludev, N.I.
32fb6af7-97e4-4d11-bca6-805745e40cc6

Singh, R., Plum, E., Menzel, C., Rockstuhl, C., Azad, A.K., Cheville, R.A., Lederer, F., Zhang, W. and Zheludev, N.I. (2009) Terahertz metamaterial with asymmetric transmission. Physical Review B, 80 (15). (doi:10.1103/PhysRevB.80.153104).

Record type: Article

Abstract

We show that a planar metamaterial, an array of coupled metal split-ring resonators with a unit cell lacking mirror symmetry, exhibits asymmetric transmission of terahertz radiation (0.25-2.5 THz) propagating through it in opposite directions. This intriguing effect, that is compatible with Lorentz reciprocity and time-reversal, depends on a directional difference in conversion efficiency of the incident circularly polarized wave into one of opposite handedness, that is only possible in lossy low-symmetry planar chiral metamaterials. We show that asymmetric transmission is linked to excitation of enantiomerically sensitive plasmons, these are induced charge-field excitations that depend on the mutual handedness of incident wave and metamaterial pattern. Various bands of positive, negative and zero phase and group velocities have been identified indicating the opportunity to develop polarization sensitive negative index and slow light media based on such metamaterials.

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Published date: 15 October 2009

Identifiers

Local EPrints ID: 78861
URI: https://eprints.soton.ac.uk/id/eprint/78861
ISSN: 1550-235X
PURE UUID: 2075e5a4-7d30-4647-9d9f-3033f9e44fc6
ORCID for E. Plum: ORCID iD orcid.org/0000-0002-1552-1840
ORCID for N.I. Zheludev: ORCID iD orcid.org/0000-0002-1013-6636

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Date deposited: 15 Mar 2010
Last modified: 03 Dec 2019 02:03

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Contributors

Author: R. Singh
Author: E. Plum ORCID iD
Author: C. Menzel
Author: C. Rockstuhl
Author: A.K. Azad
Author: R.A. Cheville
Author: F. Lederer
Author: W. Zhang
Author: N.I. Zheludev ORCID iD

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