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

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

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)

Mono/multilayer deposition on the crystal.

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Monolayer on the water

surface

crystal

Effect:- Sphere size: ~390nm- Hexagonal pattern- Spheres positions maintained

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

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,