Designing hollow-core photonic bandgap fibres free of surface modes
Designing hollow-core photonic bandgap fibres free of surface modes
Hollow-core photonic bandgap fibres (PBGFs) confine light within an air-core due to photonic bandgap effects. Such fibres allow for a very weak overlap between the guided mode and the fibre structure, which paves the way for novel and technologically enabling properties, such as low nonlinearity, high damage thresholds and transmission beyond silica's own transparency window [1]. Mid-IR transmission, not feasible in conventional fibres due to the very high absorption of silica beyond 2µm, has been recently demonstrated in silica PBGFs [2]. However, these fibres had a narrow low-loss operational bandwidth of less than 100nm, due the presence of surface modes (SMs) at their core-cladding interfaces [3]. By systematically studying feasible silica PBGFs core structures we identify new designs regimes that robustly eliminate the presence of surface modes. Optimal fibre designs with a wide transmission spectrum of ~ 350nm centred at ~ 2 µm are proposed. at the boundary with the cladding as shown in Fig.1. A systematic investigation of the effect of the ring thickness on the fibre's transmission properties was carried out. The normalized boundary thickness (T) was varied in the range 0.175 < T < 3.5 and for each fibre we solved for the modes within the bandgap. In order to assess the performance of the fibres we calculated the normalized interface field intensity of the fundamental air-guided mode, factor F [4]. This factor suffices to identify designs with broad transmission spectra as its value critically depends on whether or not the fibre supports surface modes.
1 pp
Amezcua-Correa, R.
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Broderick, N.G.
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Petrovich, M.N.
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Richardson, D.J.
ebfe1ff9-d0c2-4e52-b7ae-c1b13bccdef3
Amezcua-Correa, R.
cfb486ac-bb00-4a7d-9370-667e662a2df3
Broderick, N.G.
b85a5bab-7c7a-4db8-aede-01ccef7b5b36
Petrovich, M.N.
bfe895a0-da85-4a40-870a-2c7bfc84a4cf
Richardson, D.J.
ebfe1ff9-d0c2-4e52-b7ae-c1b13bccdef3
Amezcua-Correa, R., Broderick, N.G., Petrovich, M.N. and Richardson, D.J.
(2006)
Designing hollow-core photonic bandgap fibres free of surface modes.
Rank Prize Funds: Metamaterials in Nature and Technology Meeting, Lake Windermere, UK.
21 - 24 Aug 2006.
.
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Conference or Workshop Item
(Paper)
Abstract
Hollow-core photonic bandgap fibres (PBGFs) confine light within an air-core due to photonic bandgap effects. Such fibres allow for a very weak overlap between the guided mode and the fibre structure, which paves the way for novel and technologically enabling properties, such as low nonlinearity, high damage thresholds and transmission beyond silica's own transparency window [1]. Mid-IR transmission, not feasible in conventional fibres due to the very high absorption of silica beyond 2µm, has been recently demonstrated in silica PBGFs [2]. However, these fibres had a narrow low-loss operational bandwidth of less than 100nm, due the presence of surface modes (SMs) at their core-cladding interfaces [3]. By systematically studying feasible silica PBGFs core structures we identify new designs regimes that robustly eliminate the presence of surface modes. Optimal fibre designs with a wide transmission spectrum of ~ 350nm centred at ~ 2 µm are proposed. at the boundary with the cladding as shown in Fig.1. A systematic investigation of the effect of the ring thickness on the fibre's transmission properties was carried out. The normalized boundary thickness (T) was varied in the range 0.175 < T < 3.5 and for each fibre we solved for the modes within the bandgap. In order to assess the performance of the fibres we calculated the normalized interface field intensity of the fundamental air-guided mode, factor F [4]. This factor suffices to identify designs with broad transmission spectra as its value critically depends on whether or not the fibre supports surface modes.
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e-pub ahead of print date: 2006
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Rank Prize Funds: Metamaterials in Nature and Technology Meeting, Lake Windermere, UK, 2006-08-21 - 2006-08-24
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Local EPrints ID: 42425
URI: http://eprints.soton.ac.uk/id/eprint/42425
PURE UUID: 50ca9187-5022-43e4-ab6c-b3b45dfc46e0
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Date deposited: 12 Dec 2006
Last modified: 16 Mar 2024 03:16
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Contributors
Author:
R. Amezcua-Correa
Author:
N.G. Broderick
Author:
M.N. Petrovich
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