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Directional Control and Enhancement of Light Output of Scintillators by Using Microlens Arrays
Di Yuan1, Bo Liu1, Zhichao Zhu1
1Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physics Science and Engineering, Tongji University, Shanghai 200092, P.R. China.
ACS Applied Materials & Interfaces
|June 9, 2020
Summary
Microlens arrays significantly boost light output from scintillators used in nuclear radiation detection. This innovation enhances imaging and detection capabilities without compromising spatial resolution.
Area of Science:
- Materials Science
- Optics
- Nuclear Instrumentation
Background:
- Scintillators are crucial for nuclear radiation detection across various fields.
- High refractive index scintillators suffer from reduced light extraction due to total internal reflection.
Purpose of the Study:
- To improve light extraction efficiency and control light output directivity in scintillators.
- To investigate the application of microlens arrays on cerium-doped lutetium-yttrium oxyorthosilicate scintillators.
Main Methods:
- Fabrication of microlens arrays on scintillator surfaces.
- Optical characterization using simulations and experimental measurements.
- Evaluation of X-ray imaging performance.
Main Results:
- Achieved a 3.26-fold enhancement in light extraction efficiency at a 45° emission angle.
- Demonstrated that microlens refractive index and spacing influence enhancement.
- Observed improved gray scale amplitude in X-ray imaging without loss of spatial resolution.
Conclusions:
- Microlens arrays effectively enhance scintillator performance.
- This technique offers significant benefits for nuclear radiation detection applications.
- Further optimization of microlens parameters can yield even greater improvements.
