The implementation of an open freeware to acquire and reconstruct ultrasonic images from tomographic projections is presented. This proposed tomograph consists of three main modules: the mechanical position system, control system and the ultrasonic pulse emission-reception system. The communication, synchronization among these modules, experimental parameters and image reconstruction are done by an interface based on JAVA. The preliminary results show that the system is able to produce quality images of tested specimens.

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We present modelling results for efficient coupling of nanodiamonds containing single colour centres to polymer structures on distributed Bragg reflectors. We explain how hemispherical and super-spherical structures redirect the emission of light into small numerical apertures. Coupling efficiencies of up to 68.5% within a numerical aperture of 0.34 are found. Further, we show how Purcell factors up to 4.5 can be achieved for wavelength scale hemispheres coated with distributed Bragg reflectors. We conclude with an experimental proposal for the realisation of these structures.