76 research outputs found
Propagation effects in optical waveguides, fibres and devices
This thesis consist of a theoretical study of propagation effects in optical waveguides, fibres and photonic crystals, with some comparison with experiment. ¶ ..
Design of flexible ultrahigh-Q microcavities in diamond-based photonic crystal slabs
We design extremely flexible ultrahigh-Q diamond-based double-heterostructure
photonic crystal slab cavities by modifying the refractive index of the
diamond. The refractive index changes needed for ultrahigh-Q cavities with , are well within what can be achieved (). The cavity
modes have relatively small volumes , making them ideal for
cavity quantum electro-dynamic applications. Importantly for realistic
fabrication, our design is flexible because the range of parameters, cavity
length and the index changes, that enables an ultrahigh-Q is quite broad.
Furthermore as the index modification is post-processed, an efficient technique
to generate cavities around defect centres is achievable, improving prospects
for defect-tolerant quantum architectures.Comment: 9 pages, 4 figures (1 in colour
Reconfigurable, Defect-Free, Ultrahigh-Q Photonic Crystal Microcavities for Sensing
We propose a new approach for creating reconfigurable high-Q cavities in defect-free photonic crystal slabs (PCSs). The approach relies on selective air-hole infiltration in otherwise defect-free PCSs. We show that using this method we can design ultrahigh-Q microcavities, with Q~106. Numerical calculations indicate a large number of high-Q modes with high sensitivity, which are ideal for simultaneous, multi-parameter refractive index-based sensing
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