Configurable Optical Filter for Quantum Dot Security Element Authentication
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for optically determining unique identifiers in security elements, especially those based on quantum mechanical effects, are difficult to implement in commercial environments and lack satisfactory authentication and cross-checking capabilities.
Innovation Solution
A method and system using a configurable optical filter system with varying transmission properties, allowing for optical reading of security elements across multiple locations in a single step with a two-dimensional sensor, to create a map of optical properties that is unique and difficult to replicate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical reading is performed in a laboratory environment with controlled conditions, then measurement precision is improved, but device complexity and ease of operation deteriorate when attempting to implement in commercial environments
Solution Approach 1:
The patent employs a tunable optical filter that can dynamically adjust its transmission characteristics to selectively pass different wavelength ranges. This dynamic filtering capability allows the system to adapt to various quantum dot emission spectra without requiring multiple fixed filters, thereby maintaining measurement precision while reducing overall system complexity. The filter can be tuned in real-time to match the specific emission wavelengths of different quantum dot configurations.
Solution Approach 2:
The system changes the optical parameters (wavelength, bandwidth) of the filter dynamically to match the emission characteristics of the quantum dots being measured. By adjusting the filter's transmission wavelength and bandwidth parameters, the system can accurately capture the emission spectra of quantum dots with different sizes and compositions, maintaining precision across varying measurement conditions without requiring complex hardware changes.
2Reliability
If multiple readings are taken at different configurations to create a comprehensive map, then unique identifier reliability is improved, but reading time increases
Solution Approach 1:
The system performs optical readings at multiple discrete wavelength configurations in a systematic sequence, creating a comprehensive spectral map of the quantum dot emission. By periodically tuning the optical filter to different wavelength ranges and capturing emission intensity at each configuration, the system builds a reliable unique identifier profile. This periodic sampling approach ensures complete spectral coverage while maintaining efficient reading speeds through automated filter tuning.
Solution Approach 2:
The system pre-determines the optimal set of filter configurations and wavelength ranges needed to capture the essential spectral features of quantum dots before performing the actual measurement. This preliminary planning allows the system to efficiently execute the reading sequence without unnecessary delays, capturing only the critical spectral information needed for reliable authentication while minimizing total reading time.
3Reliability
If a configurable optical filter system is used to create detailed spectral maps, then unique identifier complexity is improved, but device complexity worsens
Solution Approach 1:
The optical filter system is designed to perform multiple functions: it can be tuned to capture emission spectra of different quantum dot types, filter out background noise and excitation light, and adapt to various measurement geometries. This multi-functionality allows a single configurable filter to replace what would otherwise require multiple specialized optical components, thereby creating detailed spectral maps for secure identification while keeping the overall device complexity manageable.
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 enables efficient and secure authentication of security elements by generating a rich and complex map of optical properties, making it harder to replicate the unique identifier and providing robust security functionality in commercial settings.
Implementation Method 1
optically reading the security element via a configurable optical filter system, a readable optical transmission property of the filter system varying with respect to a configuration of the filter system
Implementation Method 2
the security element comprises: a first part, capable of emitting electromagnetic radiation; a second part, comprising a configurable optical filter system
Data Source
AI summary
According to a first aspect of the present invention, there is provided a method of determining a unique identifier for a security element, the method comprising: optically reading the security element via a configurable optical filter system, a readable optical transmission property of the filter system varying with respect to a configuration of the filter system; the reading comprising determining data indicative of an optical property of the security element at a first configuration of the filter system, and determining data indicative of an optical property of the security element at a second, different, configuration of the filter system; and the unique identifier being determined from a map of the variation in determined data indicative of an optical property with respect to the configuration of the filter system, wherein the reading is undertaken for multiple locations across the security element at the or each configuration of the filter system, such that the map is a map of the variation in determined data indicative of an optical property across the security element with respect to the configuration of the filter system, and wherein the reading for multiple locations across the security element is undertaken in a single reading step, using a reader with a two-dimensional sensor.