This research project is supported by a Marie Curie Early Initial Training Network Fellowship of the European Community’s Seventh Framework Programme under contract number (PITN-GA PicoSEC-MCNet) Light extraction from scintillating crystals 13 March 2015 Pawel Modrzynski, CERN Marie Curie fellow
Agenda 1.Scintillating crystals 2.Nano - patterning of scintillating crystals – ideas 3.Few words about me ‹#›
Crystals Scintillator is a material that exhibits scintillation — the property of luminescence when excited by ionizing radiation. Luminescent materials, when struck by an incoming particle, absorb its energy and scintillate, (i.e., re-emit the absorbed energy in the form of light). ‹#›
0.8mm x 0.8mm crystal has been wrapped in carbon conductive tape. Visible face has been deposited with chromium ‹#›
Sample after patterning. 24 patches – holes each. Holes dimensions: ~320nm diameter, ~400nm depth holes ‹#›
1.4x1.4x7.2 mm crystal deposited with TiO2, 178 zones of 50x50 um – holes each 24 patches – directly engraved in the crystal, holes each 30 – 35 % from preliminary measurements between patterned and unpatterned area, when excited with UV diode, air contact 40 – 70 % from preliminary measurements between patterned and unpatterned area, when excited with UV diode, air contact
Opal photonic crystals 2 ideas for Opal PhC on scintillators: i.Mono/Polilayer deposited on the crystal. ii.TiO2 patterning using “lift off” of the opals. ‹#›
Langmuir-Blodgett monolayer deposition method Langmuir-Blodgett deposition trough (produced by KSV Nima)
Mono/multilayer deposition on the crystal. ‹#› Monolayer on the water surface crystal
Effect: -Sphere size: ~390nm -Hexagonal pattern -Spheres positions maintained
Langmuir-Blodgett deposition (AFM image) Sample: glass Effect: -Sphere size: ~400nm -Hexagonal pattern
‹#› Deposition tests : Langmuir-Blodgett method Sample: glass and silicon wafer Material: 400nm in diameter polystyrene spheres
Few Words about me PhD Student at UCL(University College London) Topic: Light extraction from scintillating crystals Studies: Materials engineering, Wroclaw University of Technology (2004 – 2010) Master thesis: Vortex Anemometer Using MEMS Cantilever Sensor 05 Vortex Anemometer Using MEMS Cantilever Sensor, Zylka, P.; Modrzynski, P.; Janus, P.; Journal Of Microelectromechanical Systems, ISSN: , Vol: 19, Issue: 6, Date: 2010, Start page: 1485,