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Ultrafast all-optical switching of germanium-based flexible metaphotonic devices

Ultrafast all-optical switching of germanium-based flexible metaphotonic devices
Ultrafast all-optical switching of germanium-based flexible metaphotonic devices
Incorporating semiconductors as active media into metamaterials offers opportunities for a wide range of dynamically switchable/tunable, technologically relevant optical functionalities enabled by strong, resonant light–matter interactions within the semiconductor. Here, a germanium-thin-film-based flexible metaphotonic device for ultrafast optical switching of terahertz radiation is experimentally demonstrated. A resonant transmission modulation depth of 90% is achieved, with an ultrafast full recovery time of 17 ps. An observed sub-picosecond decay constant of 670 fs is attributed to the presence of trap-assisted recombination sites in the thermally evaporated germanium film.
1521-4095
Lim, Wen-Xiang
d251c6ef-ac81-4fc1-b458-386900c1c7dd
Manjappa, Manukumara
0034fce0-00e0-4cfe-b01d-988ba3a4d388
Srivastava, Yogesh Kumar
968cc6c3-957e-4712-82fb-846339345036
Cong, Longqing
b0f8a1be-0ae3-419d-b90a-fead0aa2b88c
Kumar, Abhishek
23078539-c9f9-4955-96ff-3ba9d1bd8bf5
MacDonald, Kevin F.
76c84116-aad1-4973-b917-7ca63935dba5
Singh, Ranjan
895cd3c3-d3d4-4c1f-81f9-f7cbbd13eae8
Lim, Wen-Xiang
d251c6ef-ac81-4fc1-b458-386900c1c7dd
Manjappa, Manukumara
0034fce0-00e0-4cfe-b01d-988ba3a4d388
Srivastava, Yogesh Kumar
968cc6c3-957e-4712-82fb-846339345036
Cong, Longqing
b0f8a1be-0ae3-419d-b90a-fead0aa2b88c
Kumar, Abhishek
23078539-c9f9-4955-96ff-3ba9d1bd8bf5
MacDonald, Kevin F.
76c84116-aad1-4973-b917-7ca63935dba5
Singh, Ranjan
895cd3c3-d3d4-4c1f-81f9-f7cbbd13eae8

Lim, Wen-Xiang, Manjappa, Manukumara, Srivastava, Yogesh Kumar, Cong, Longqing, Kumar, Abhishek, MacDonald, Kevin F. and Singh, Ranjan (2018) Ultrafast all-optical switching of germanium-based flexible metaphotonic devices Advanced Materials (doi:10.1002/adma.201705331).

Record type: Article

Abstract

Incorporating semiconductors as active media into metamaterials offers opportunities for a wide range of dynamically switchable/tunable, technologically relevant optical functionalities enabled by strong, resonant light–matter interactions within the semiconductor. Here, a germanium-thin-film-based flexible metaphotonic device for ultrafast optical switching of terahertz radiation is experimentally demonstrated. A resonant transmission modulation depth of 90% is achieved, with an ultrafast full recovery time of 17 ps. An observed sub-picosecond decay constant of 670 fs is attributed to the presence of trap-assisted recombination sites in the thermally evaporated germanium film.

Text Ge metaphotonic device accepted manuscript - Accepted Manuscript
Restricted to Repository staff only until 12 January 2019.
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More information

Accepted/In Press date: 30 October 2017
e-pub ahead of print date: 12 January 2018

Identifiers

Local EPrints ID: 415377
URI: https://eprints.soton.ac.uk/id/eprint/415377
ISSN: 1521-4095
PURE UUID: 9d81dc01-dbec-4738-8252-051519b4f5a5
ORCID for Kevin F. MacDonald: ORCID iD orcid.org/0000-0002-3877-2976

Catalogue record

Date deposited: 08 Nov 2017 17:30
Last modified: 30 Jan 2018 17:32

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Contributors

Author: Wen-Xiang Lim
Author: Manukumara Manjappa
Author: Yogesh Kumar Srivastava
Author: Longqing Cong
Author: Abhishek Kumar
Author: Ranjan Singh

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