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Outreach

Primary and Second Level Outreach

 

Summer Students

  • Jil Gueguen, a third year student from  the Ecole Nationale supérieure de Physique, d'Electronique et de Matériaux de Grenoble worked on a 12 week placement in the Spectroscopy group with Dr Tom McCormack. Her work included a system being set up to investigate the time resolved EUV spectra of laser produced plasmas of tin and aluminum. The system comprised of a high power Nd:YAG laser, a grazing incidence EUV spectrograph with electronic detection. The detector was formed by coupling the output of a gated MCP to a phosphor screen. The image on the screen was then recorded by a digital camera. The system had just been installed and the first spectra recorded. The 13.5 nm UTA of Sn had been recorded and also the effect of the time delay between the laser pulse and the gating of the detector were reported for Al.

 

  • Conor Murphy, a third year UCD Physics student worked with Dr Kenneth Fahy on preliminary work concerning the use of lithium fluoride (LiF) crystals as imaging detectors for EUV and soft x-ray radiation. The EUV or soft x-ray radiation generates stable colour centres on the LiF crystal which emit an intense fluorescence in the visible spectral range under suitable optical excitation. The LiF detector can image at high resolution (<1μm) and high contrast with a high dynamic range. The LiF detector also allows permanent storage of images as well as the ability to clear the image and reuse the LiF crystal. A laser plasma EUV/Soft x-ray source was generated using a Nd:YAG laser focussed onto a solid target, producing radiation up to 1.5 keV. Images of different biological samples are presented with a spatial resolution of about a micron, obtained over a field of view of several mm2. These images could be used to distinguish between species of Stonefly, based on wing venation.

 

  • Marie Mazoyer is a French student from the School of Engineering in Physics, Electronics and Materials Science, Grenoble INP-Phelma. She was a summer research student working with the Spectroscopy group from June to August 2010 on a project entitled: “Reflectivity and temporal shaping of a CO2 laser pulse during irradiation of a solid target”. Her work revolved around the development of a novel technique of shortening the CO2 (carbon dioxide) pulse.CO2 laser produced Sn (tin) plasmas are proposed as a possible source of Extreme Ultraviolet (EUV), for next generation lithography used in the production of semiconductor devices. The pulse duration of the laser is however very long with an elongated tail due to the presence of N2 (nitrogen) gas in the laser chamber as part of the lasing process. The result of this being a large amount of energy incident on the Sn target won’t generate EUV light. Reducing the length of the pulse should improve the ratio for the amount of EUV produced from the laser energy used.Marie carried out simulations on the evolution of the surface temperature of a target under laser irradiation, to determine the boiling time. The modelling was carried out on two materials which were used for the pulse shortening technique. She also worked on experiments to record the variation in the pulse duration and energy before and after the pulse length was reduced. The results produced are currently being employed in a pulse shortening system and are expected to be published shortly.

 

  • Niall Kennedy, a third year student from UCD worked with Dr Fergal O'Reilly, Dr Tony Donnelly and Thomas Cummins on developing dose information on LiF films, for use as a detector of EUV and soft x-ray radiation.  This is an ongoing area of research in the group, and the EUV source that Niall used was a 13.5 nm broad band laser plasma source, using a CO2 laser plasma.

 

Media

 

Other Events

  • IOP Postgraduate Research Poster Competition Organiser (Dr. Emma Sokell)
  • Graduate Student Workshop on Extreme UV Lithography, Optics and Sources in UCD, September 23-24th 2009 (Prof. Gerry O'Sullivan and Dr. Rebekah D'Arcy jointly with the group of Larissa Juschkin from RWTH Aachen and the Fraunhoffer Institute at Aachen).