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Complete photonic bandgaps in 12-fold symmetric quasicrystals

Complete photonic bandgaps in 12-fold symmetric quasicrystals
Complete photonic bandgaps in 12-fold symmetric quasicrystals
Photonic crystals are attracting current interest for a variety of reasons, such as their ability to inhibit the spontaneous emission of light. This and related properties arise from the formation of photonic bandgaps, whereby multiple scattering of photons by lattices of periodically varying refractive indices acts to prevent the propagation of electromagnetic waves having certain wavelengths. One route to forming photonic crystals is to etch two-dimensional periodic lattices of vertical air holes into dielectric slab waveguides. Such structures can show complete photonic bandgaps, but only for large-diameter air holes in materials of high refractive index (such as gallium arsenide, n = 3.69), which unfortunately leads to significantly reduced optical transmission when combined with optical fibres of low refractive index. It has been suggested that quasicrystalline (rather than periodic) lattices can also possess photonic bandgaps. Here we demonstrate this concept experimentally and show that it enables complete photonic bandgaps—non-directional and for any polarization—to be realized with small air holes in silicon nitride (n = 2.02), and even glass (n = 1.45). These properties make photonic quasicrystals promising for application in a range of optical devices.
0028-0836
740
Zoorob, M.E.
01b3a61a-95c3-45d5-a06b-caa91c734cfd
Charlton, M.B.D.
da2a6dd8-1b4f-48a6-b4cd-89ea3c086e45
Parker, G.J.
0be0b760-c634-410d-adf6-076c6636be7e
Baumberg, J.J.
78e1ea7e-8c70-404c-bf84-59aafe75cd07
Netti, M.C.
e565f0dc-9641-4f19-a536-f1c1f01ea0dd
Zoorob, M.E.
01b3a61a-95c3-45d5-a06b-caa91c734cfd
Charlton, M.B.D.
da2a6dd8-1b4f-48a6-b4cd-89ea3c086e45
Parker, G.J.
0be0b760-c634-410d-adf6-076c6636be7e
Baumberg, J.J.
78e1ea7e-8c70-404c-bf84-59aafe75cd07
Netti, M.C.
e565f0dc-9641-4f19-a536-f1c1f01ea0dd

Zoorob, M.E., Charlton, M.B.D., Parker, G.J., Baumberg, J.J. and Netti, M.C. (2000) Complete photonic bandgaps in 12-fold symmetric quasicrystals. Nature, 404 (6779), 740.

Record type: Article

Abstract

Photonic crystals are attracting current interest for a variety of reasons, such as their ability to inhibit the spontaneous emission of light. This and related properties arise from the formation of photonic bandgaps, whereby multiple scattering of photons by lattices of periodically varying refractive indices acts to prevent the propagation of electromagnetic waves having certain wavelengths. One route to forming photonic crystals is to etch two-dimensional periodic lattices of vertical air holes into dielectric slab waveguides. Such structures can show complete photonic bandgaps, but only for large-diameter air holes in materials of high refractive index (such as gallium arsenide, n = 3.69), which unfortunately leads to significantly reduced optical transmission when combined with optical fibres of low refractive index. It has been suggested that quasicrystalline (rather than periodic) lattices can also possess photonic bandgaps. Here we demonstrate this concept experimentally and show that it enables complete photonic bandgaps—non-directional and for any polarization—to be realized with small air holes in silicon nitride (n = 2.02), and even glass (n = 1.45). These properties make photonic quasicrystals promising for application in a range of optical devices.

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Published date: 2000

Identifiers

Local EPrints ID: 14663
URI: https://eprints.soton.ac.uk/id/eprint/14663
ISSN: 0028-0836
PURE UUID: d219ab0e-a9d5-42c7-8bc4-dc61816ee4f3

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Date deposited: 23 Feb 2005
Last modified: 17 Aug 2017 12:29

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