School of Physics - Theses

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Type: Masters Research thesis × Author: DRUMM, VIRGINIA ×

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    Channelled ion beam analysis of diamond
    DRUMM, VIRGINIA ( 2010)
    The remarkable attributes of diamond make it a promising material for the implementation of emerging quantum technologies for information processing and communication. In particular, the colour centres of diamond have been shown to have desirable properties for use as single photon sources and for the storage and manipulation of quantum states that can act as optically readable quantum bits. Successful exploitation of these attributes requires the development of new methods to controllably insert dopant atoms into the diamond lattice and to fabricate photonic structures around the emitters. In particular, monolithic diamond has important advantages so that emitters can be embedded in the centre of the optical mode. In this thesis, both the creation of centres, and the creation of photonic structures is addressed. Colour centres based on Ni containing diamond have desirable luminescence in the near infra-red but the location of Ni in the diamond lattice is not known. Here the lattice location of dopants in Ni containing high pressure, high temperature diamond is investigated by Rutherford backscattering with ion channelling and use of the ion induced X-ray signal from the trace Ni. This work reveals that, despite the dense packing of the diamond lattice, Ni is substituted into the diamond lattice. Thin diamond membranes, with promising attributes for photonic devices, can be fabricated by deep ion beam lithography. A crucial attribute for devices in these membranes is the quality of the membrane surface which is examined here with ion channelling. This is highly sensitive to the membrane surface damage produced by the lithography process. In this case the surface is shown to contain significant residual ion beam damage. Transmission electron microscopy is used to directly observe this interface. Residual surface damage is further quantified by complementary measurements with X-ray photoelectron spectroscopy and X-ray absorption fine structure measurements which probe the atomic bonding.