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Enhanced light emission from improved homogeneity in biaxially suspended Germanium membranes from curvature optimization

Enhanced light emission from improved homogeneity in biaxially suspended Germanium membranes from curvature optimization
Enhanced light emission from improved homogeneity in biaxially suspended Germanium membranes from curvature optimization
A silicon compatible light source is crucial to develop a fully monolithic silicon photonics platform. Strain engineering in suspended Germanium membranes has offered a potential route for such a light source. However, biaxial structures have suffered from poor optical properties due to unfavorable strain distributions. Using a novel geometric approach and finite element modelling (FEM) structures with improved strain homogeneity were designed and fabricated. Micro-Raman (μ-Raman) spectroscopy was used to determine central strain values. Micro-photoluminescence (μ-PL) was used to study the effects of the strain profiles on light emission; we report a PL enhancement of up to 16x relative to bulk Ge at 0.5% biaxial strain. This geometric approach offers opportunity for enhancing the light emission in Germanium towards developing a practical on chip light source.
1094-4087
22911-22922
Burt, Daniel
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Al-Attili, Abdelrahman
534a1c1f-3f8c-4a78-b71b-50c156e23373
Li, Zuo
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Gardes, Frederic
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Sotto, Moise, Sala Henri
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Higashitarumizu, Naoki
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Ishikawa, Yashuhiko
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Oda, Katsuya
c9319567-c99b-4564-a31a-05ca9ae86a31
Querin, Ozz
ba3e4f2b-1c65-46e6-ae34-72ca945ff55c
Saito, Shinichi
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Kelsall, Robert
ddf86f22-e3b2-42ea-8ddc-4df3afed27c1
Burt, Daniel
49c801a2-fb48-40f2-b72f-f713151b96e6
Al-Attili, Abdelrahman
534a1c1f-3f8c-4a78-b71b-50c156e23373
Li, Zuo
05f14f5e-fc6e-446e-ac52-64be640b5e42
Gardes, Frederic
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Sotto, Moise, Sala Henri
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Higashitarumizu, Naoki
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Ishikawa, Yashuhiko
36692c79-257f-4224-811a-c43227922ed3
Oda, Katsuya
c9319567-c99b-4564-a31a-05ca9ae86a31
Querin, Ozz
ba3e4f2b-1c65-46e6-ae34-72ca945ff55c
Saito, Shinichi
14a5d20b-055e-4f48-9dda-267e88bd3fdc
Kelsall, Robert
ddf86f22-e3b2-42ea-8ddc-4df3afed27c1

Burt, Daniel, Al-Attili, Abdelrahman, Li, Zuo, Gardes, Frederic, Sotto, Moise, Sala Henri, Higashitarumizu, Naoki, Ishikawa, Yashuhiko, Oda, Katsuya, Querin, Ozz, Saito, Shinichi and Kelsall, Robert (2017) Enhanced light emission from improved homogeneity in biaxially suspended Germanium membranes from curvature optimization. Optics Express, 25 (19), 22911-22922. (doi:10.1364/OE.25.022911).

Record type: Article

Abstract

A silicon compatible light source is crucial to develop a fully monolithic silicon photonics platform. Strain engineering in suspended Germanium membranes has offered a potential route for such a light source. However, biaxial structures have suffered from poor optical properties due to unfavorable strain distributions. Using a novel geometric approach and finite element modelling (FEM) structures with improved strain homogeneity were designed and fabricated. Micro-Raman (μ-Raman) spectroscopy was used to determine central strain values. Micro-photoluminescence (μ-PL) was used to study the effects of the strain profiles on light emission; we report a PL enhancement of up to 16x relative to bulk Ge at 0.5% biaxial strain. This geometric approach offers opportunity for enhancing the light emission in Germanium towards developing a practical on chip light source.

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oe-25-19-22911 - Version of Record
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In preparation date: 12 June 2017
Accepted/In Press date: 11 August 2017
e-pub ahead of print date: 11 September 2017
Published date: 18 September 2017

Identifiers

Local EPrints ID: 412307
URI: https://eprints.soton.ac.uk/id/eprint/412307
ISSN: 1094-4087
PURE UUID: 47ed8c3a-e042-40eb-a502-e927e5220c3e
ORCID for Shinichi Saito: ORCID iD orcid.org/0000-0003-1539-1182

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Date deposited: 17 Jul 2017 13:27
Last modified: 03 Dec 2019 01:38

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Contributors

Author: Daniel Burt
Author: Abdelrahman Al-Attili
Author: Zuo Li
Author: Frederic Gardes
Author: Moise, Sala Henri Sotto
Author: Naoki Higashitarumizu
Author: Yashuhiko Ishikawa
Author: Katsuya Oda
Author: Ozz Querin
Author: Shinichi Saito ORCID iD
Author: Robert Kelsall

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