Multilayer Nanostructure Scintillator for Directional Photon Emission
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Solution Overview
Problem
Current scintillation detectors face limitations in efficiency and time resolution due to the isotropy of spontaneous emission and inefficient outcoupling of radiation, which restricts applications such as PET scan resolution, X-ray camera temporal resolution, and high-energy particle identification.
Innovation Solution
A multilayer nanostructure composed of alternating materials with different refractive indices is used to control the emission rate and directionality of radiation, enhancing the number of detectable photons and reducing detection timing by shaping the emitted radiation to focus it in specific directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional scintillators with isotropic spontaneous emission are used, then the emission process is simple, but the outcoupling efficiency is low and time resolution is limited
Solution Approach 1:
The scintillator is segmented into a multilayer nanostructure with alternating high and low refractive index layers. This segmentation creates multiple interfaces that manipulate light propagation, enhancing outcoupling efficiency and enabling faster detection by directing more photons toward the sensor within a shorter time window.
Solution Approach 2:
Different layers in the multilayer structure have locally optimized properties: high refractive index layers maximize light confinement and interaction, while low refractive index layers facilitate light extraction. This local quality variation throughout the structure collectively improves both detection efficiency and time resolution.
2Productivity
If the amount of scintillation material is increased to improve detection efficiency, then more photons are emitted, but the cost and device complexity increase
Solution Approach 1:
The invention uses composite multilayer structures combining materials with different refractive indices. This composite approach enhances light management and outcoupling efficiency without requiring proportionally more scintillation material, thereby improving detection efficiency while controlling device complexity and cost.
3Quantity of substance
If conventional scintillators emit radiation in all directions, then the emission process is isotropic, but most radiation is lost and does not reach the detector
Solution Approach 1:
The multilayer nanostructure introduces dimensional control over light propagation by creating a stratified architecture. This dimensional organization guides photons preferentially toward the detector direction through repeated refraction and reflection at interfaces, converting isotropic emission into anisotropic directional emission and reducing radiation loss.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly increases the efficiency and time resolution of radiation detection, allowing for higher sensitivity and reduced radiation exposure, while also reducing the amount of scintillation material needed, thereby lowering costs and improving image resolution in medical imaging applications.
Implementation Method 1
A multilayer nanostructure composed of alternating materials with different refractive indices is used to control the emission rate and directionality of radiation
Implementation Method 2
The scintillator efficiently converts the excitation's energy into light in the optical range via luminescence centers
Implementation Method 3
each pair can recombine radiatively by emitting less energetic photonic radiation through spontaneous emission
Implementation Method 4
Photomultiplier tubes absorb the light emitted by the scintillation material and convert it to an electron current via the photoelectric effect
Data Source
AI summary
The present invention discloses a scintillator structure and to a method for producing an output optical signal at a specific wavelength range. The scintillator structure comprises a multilayer nanostructure formed by at least one pair of alternating first and second layered material being arranged along one or more principal axes. The multi-layer nanostructure defines predetermined geometrical parameters and the structure is made of at least two different material compositions. At least one of the first layered material, the second layered material, or the combination of both, define scintillation properties. The invention also discloses a detector system for detecting an input radiation comprising a scintillator structure being as defined above and being configured and operable to collect most of the emitted optical signal.