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Strong modulation of plasmons in Graphene with the use of an Inverted pyramid array diffraction grating

Strong modulation of plasmons in Graphene with the use of an Inverted pyramid array diffraction grating
Strong modulation of plasmons in Graphene with the use of an Inverted pyramid array diffraction grating
An optical device configuration allowing efficient electrical tuning of surface plasmon wavelength and absorption in a suspended/conformal graphene film is reported. An underlying 2-dimensional array of inverted rectangular pyramids greatly enhances optical coupling to the graphene film. In contrast to devices utilising 1D grating or Kretchman prism coupling configurations, both s and p polarization can excite plasmons due to symmetry of the grating structure. Additionally, the excited high frequency plasmon mode has a wavelength independent of incident photon angle allowing multidirectional coupling. By combining analytical methods with Rigorous Coupled-Wave Analysis, absorption of plasmons is mapped over near infrared spectral range as a function of chemical potential. Strong control over both plasmon wavelength and strength is provided by an ionic gel gate configuration. 0.04eV change in chemical potential increases plasmon energy by 0.05?eV shifting plasmon wavelength towards the visible, and providing enhancement in plasmon absorption. Most importantly, plasmon excitation can be dynamically switched off by lowering the chemical potential and moving from the intra-band to the inter-band transition region. Ability to electrically tune plasmon properties can be utilized in applications such as on-chip light modulation, photonic logic gates, optical interconnect and sensing applications.
Matthaiakakis, Nikolaos
90368fe2-757a-4b9b-8246-8051b98d1f15
Mizuta, Hiroshi
f14d5ffc-751b-472b-8dba-c8518c6840b9
Charlton, Martin
fcf86ab0-8f34-411a-b576-4f684e51e274
Matthaiakakis, Nikolaos
90368fe2-757a-4b9b-8246-8051b98d1f15
Mizuta, Hiroshi
f14d5ffc-751b-472b-8dba-c8518c6840b9
Charlton, Martin
fcf86ab0-8f34-411a-b576-4f684e51e274

Matthaiakakis, Nikolaos, Mizuta, Hiroshi and Charlton, Martin (2016) Strong modulation of plasmons in Graphene with the use of an Inverted pyramid array diffraction grating. Scientific Reports, 6, [27550]. (doi:10.1038/srep27550).

Record type: Article

Abstract

An optical device configuration allowing efficient electrical tuning of surface plasmon wavelength and absorption in a suspended/conformal graphene film is reported. An underlying 2-dimensional array of inverted rectangular pyramids greatly enhances optical coupling to the graphene film. In contrast to devices utilising 1D grating or Kretchman prism coupling configurations, both s and p polarization can excite plasmons due to symmetry of the grating structure. Additionally, the excited high frequency plasmon mode has a wavelength independent of incident photon angle allowing multidirectional coupling. By combining analytical methods with Rigorous Coupled-Wave Analysis, absorption of plasmons is mapped over near infrared spectral range as a function of chemical potential. Strong control over both plasmon wavelength and strength is provided by an ionic gel gate configuration. 0.04eV change in chemical potential increases plasmon energy by 0.05?eV shifting plasmon wavelength towards the visible, and providing enhancement in plasmon absorption. Most importantly, plasmon excitation can be dynamically switched off by lowering the chemical potential and moving from the intra-band to the inter-band transition region. Ability to electrically tune plasmon properties can be utilized in applications such as on-chip light modulation, photonic logic gates, optical interconnect and sensing applications.

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More information

Accepted/In Press date: 20 May 2016
e-pub ahead of print date: 9 June 2016
Published date: 9 June 2016
Organisations: Nanoelectronics and Nanotechnology

Identifiers

Local EPrints ID: 402499
URI: http://eprints.soton.ac.uk/id/eprint/402499
PURE UUID: fbfa4694-a311-4215-9afe-d3460b9efb1b
ORCID for Nikolaos Matthaiakakis: ORCID iD orcid.org/0000-0002-3886-5208

Catalogue record

Date deposited: 09 Nov 2016 14:15
Last modified: 17 Jan 2020 17:31

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Contributors

Author: Nikolaos Matthaiakakis ORCID iD
Author: Hiroshi Mizuta
Author: Martin Charlton

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