Defects on the free surface of superfluid helium

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Large mode area photonic crystal fibre

The authors report the realisation of a new design for a large mode area monomode optical fibre. This photonic crystal fibre will guide only a single mode, no matter how large the fibre diameter, provided the shape is kept constant. This is demonstrated with a fibre which has a core diameter equal to approximately 50 free-space wavelengths

Photonic crystals as optical fibres - physics and applications

We describe the fabrication, characterisation and possible applications of a new type of optical material - a 2-dimensional photonic crystal made of silica and air. This macroporous silica, which is made using the technology of optical fibre fabrication, has properties which differ remarkably from those of conventional materials. We describe how such a material can be used to form waveguides with new and unusual properties, and present some results to illustrate this. Such photonic crystal waveguides could be significant in the design of new lasers and amplifiers

Silica/air photonic crystal fibres

We describe the fabrication, characterisation and applications of silica/air photonic crystal fibres with microscopic arrays of air capillaries running along their length