Computational design and microfabrication of photonic quasicrystals
Computational design and microfabrication of photonic quasicrystals
Photonic crystals are attracting much interest due to their ability to inhibit spontaneous emission of light. This and related properties arise from the formation of photonic bandgaps, whereby multiple scattering of light by lattices of periodically varying refractive indices act to prevent the propagation of electromagnetic waves having certain wavelengths. The etching of regular two-dimensional vertical air rods has formed a popular method for the formation photonic crystals in a dielectric planar waveguide. However, the ability for such a structure to possess a complete photonic bandgap is only possible by the use of large air rod diameters and high dielectric constants. Such structures lead to significant losses due to refractive index mismatch and large out-of-plane scattering when coupled with current fibre optical networks of low refractive index.
In this thesis the use of a quasicrystalline structure is proposed instead of the regular crystal lattice. For the first time, a twelve-fold symmetric photonic quasicrystal is designed and successfully modelled using the finite-difference time-domain method. It was shown to possess a complete and absolute photonic bandgap with small air rods in a relatively low refractive index material Silicon Nitride (n=2.02). It is also shown that such complete and absolute photonic bandgaps are also realisable in low refractive index materials such as glass (n=1.45). This would provide a whole range of optical devices based on the photonic quasicrystal that are directly compatible with current fibre optical networks.
The first photonic quasicrystal embedded in a Silicon Nitride waveguide to operate in the visible to infrared region of the electromagnetic spectrum was also shown. The quasicrystal was experimentally shown to possess the complete and absolute photonic bandgap.
University of Southampton
Zoorob, Majd Elias
7eec85c4-545a-40ac-8371-89cf7c6df687
2001
Zoorob, Majd Elias
7eec85c4-545a-40ac-8371-89cf7c6df687
Zoorob, Majd Elias
(2001)
Computational design and microfabrication of photonic quasicrystals.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
Photonic crystals are attracting much interest due to their ability to inhibit spontaneous emission of light. This and related properties arise from the formation of photonic bandgaps, whereby multiple scattering of light by lattices of periodically varying refractive indices act to prevent the propagation of electromagnetic waves having certain wavelengths. The etching of regular two-dimensional vertical air rods has formed a popular method for the formation photonic crystals in a dielectric planar waveguide. However, the ability for such a structure to possess a complete photonic bandgap is only possible by the use of large air rod diameters and high dielectric constants. Such structures lead to significant losses due to refractive index mismatch and large out-of-plane scattering when coupled with current fibre optical networks of low refractive index.
In this thesis the use of a quasicrystalline structure is proposed instead of the regular crystal lattice. For the first time, a twelve-fold symmetric photonic quasicrystal is designed and successfully modelled using the finite-difference time-domain method. It was shown to possess a complete and absolute photonic bandgap with small air rods in a relatively low refractive index material Silicon Nitride (n=2.02). It is also shown that such complete and absolute photonic bandgaps are also realisable in low refractive index materials such as glass (n=1.45). This would provide a whole range of optical devices based on the photonic quasicrystal that are directly compatible with current fibre optical networks.
The first photonic quasicrystal embedded in a Silicon Nitride waveguide to operate in the visible to infrared region of the electromagnetic spectrum was also shown. The quasicrystal was experimentally shown to possess the complete and absolute photonic bandgap.
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Published date: 2001
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Local EPrints ID: 464363
URI: http://eprints.soton.ac.uk/id/eprint/464363
PURE UUID: f0b4f238-32c7-415e-a651-273def1fb513
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Date deposited: 04 Jul 2022 22:20
Last modified: 16 Mar 2024 19:27
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Author:
Majd Elias Zoorob
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