Alumni

Current research / employment

Abstract of IMPRS PhD thesis:

My thesis describes the theoretical and experimental investigation of metal-filled photonic crystal fibres (PCFs) and their fabrication. It explains how to overcome the obstacles when infiltrating molten metals into sub-micron holes in fused silica (SiO2) PCF. The optical properties of such filled fibres are theoretically and experimentally investigated, focusing on the coupling between the core mode of the fibres and the surface plasmon polaritons (SPPs) on the metal wires.

In my work I introduce the ideas, physical challenges and results of two new filling techniques: the pressure cell technique and the splicing technique. These techniques make it possible for the first time to fill different fibre structures with sub-micron sized holes, such as PCFs and single-hole capillaries, with different metals like gold (Au) and silver (Ag). Samples with hole diameters between 120 nm and 20 μm and aspect ratios as high as 75000 have been realized.

Theoretical simulations and models have been developed in order to understand the optical behaviour of these novel structures. The light guided in the core of the filled PCF structure will couple to SPP modes on the wires. Several measurements have been performed to determine the resonance wave- lengths and losses of such filled PCF structures. Also, different phenomena such as the shift of the resonance position with the wire diameter or pitch and the polarization dependence of SPP in polarization maintaining (PM)-PCF have been investigated.

The fabrication of free standing metal arrays was another focus of my work. The critical question was how to remove the surrounding SiO2 from the metal wires. Two different approaches have been tried: etching of the SiO2 and cleaving the PCF.

Current employer: Ovantu


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