this research project is supported by a marie curie early initial training network fellowship of the...
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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-2011-289355-PicoSEC-MCNet)
Light extraction from scintillating crystals
13 March 2015Pawel Modrzynski, CERN Marie Curie fellow
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Agenda
1. Scintillating crystals2. Nano - patterning of scintillating
crystals – ideas3. Few words about me
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CrystalsScintillator 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).
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0.8mm x 0.8mm crystal has been wrapped in carbon conductive tape. Visible face has been deposited with chromium
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Sample after patterning.24 patches – 40000 holes each.
Holes dimensions: ~320nm diameter, ~400nm depth960000 holes
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1.4x1.4x7.2 mm crystal deposited with TiO2,178 zones of 50x50 um – 10000 holes each
24 patches – directly engraved in the crystal,40000 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
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Opal photonic crystals2 ideas for Opal PhC on scintillators:
i. Mono/Polilayer deposited on the crystal.ii. TiO2 patterning using “lift off” of the opals.
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Langmuir-Blodgett monolayer deposition method
Langmuir-Blodgett deposition trough (produced by KSV Nima)
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Mono/multilayer deposition on the crystal.
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Monolayer on the water
surface
crystal
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Effect:- Sphere size: ~390nm- Hexagonal pattern- Spheres positions maintained
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Langmuir-Blodgett deposition (AFM image)
Sample: glassEffect:- Sphere size: ~400nm- Hexagonal pattern
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Deposition tests : Langmuir-Blodgett methodSample: glass and silicon waferMaterial: 400nm in diameter polystyrene spheres
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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
http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5598505Vortex Anemometer Using MEMS Cantilever Sensor,Zylka, P.; Modrzynski, P.; Janus, P.;Journal Of Microelectromechanical Systems, ISSN: 10577157, Vol: 19, Issue: 6, Date: 2010, Start page: 1485,