Nanostructured Field Vector Detector Array for Radiation Beam Analysis
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Solution Overview
Problem
Current methods for detecting the intensity distribution of electromagnetic field components in radiation beams are limited by low spatial resolution, inability to measure longitudinal polarization, and time-consuming single pixel acquisition, which restricts the determination of field vector components and phase positions.
Innovation Solution
A high-resolution two-dimensional intensity sensor array combined with a field vector detector array featuring nanostructured detector structures that utilize localized plasmon resonance and surface plasmons to selectively detect transverse and longitudinal field vector components, enabling simultaneous amplitude and phase measurement across a wide angular spectrum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If standard photodetectors or intensity sensor arrays are used to measure intensity distribution, then measurement capability is provided, but spatial resolution is limited and only intensity can be detected without field vector components
Solution Approach 1:
The detector array is segmented into multiple specialized detector elements, each equipped with different nanostructures (apertureless tips, aperture tips with various aperture shapes and orientations) to selectively detect different field vector components (Ex, Ey, Ez). This segmentation allows simultaneous measurement of all field vector components across the beam cross-section with high spatial resolution
Solution Approach 2:
Each detector element has locally optimized nanostructures with specific geometries and orientations tailored to detect particular field vector components. For example, aperture tips have apertures oriented at different angles to select specific polarization directions, while apertureless tips detect longitudinal components, providing local quality enhancement for vector field detection
2Adaptability or versatility
If orthogonally aligned polarizers or polarization beam splitters are used to separate lateral field vector components, then vector component separation is achieved, but only x and y directions can be detected and longitudinal component Ez is lost
Solution Approach 1:
The detector array achieves multi-functionality by integrating multiple detection capabilities into a single unified structure. Each detector element can detect multiple field vector components (Ex, Ey, Ez) through appropriately configured nanostructures, eliminating the need for separate polarizers and beam splitters for each component while maintaining comprehensive vector field measurement capability
Solution Approach 2:
The patent replaces complex mechanical optical systems (polarizers, beam splitters, interferometers) with nanostructured detector elements that directly interact with the electromagnetic field. The nanostructures (aperture tips, apertureless tips) serve as integrated polarization selectors and field component separators, substituting bulky mechanical components with miniaturized functional structures
3Measurement precision
If interferometers are used for phase measurement, then phase information can be obtained, but additional intensity-reducing beam splitters are required and measurement efficiency decreases
Solution Approach 1:
The detector array merges amplitude and phase measurement capabilities into a single integrated detection process. By using nanostructured detector elements that directly convert electromagnetic field information into detectable signals, the system simultaneously obtains both amplitude and phase information without requiring separate interferometric paths or additional beam splitting components
Solution Approach 2:
The patent extracts the phase measurement function from the complex interferometer system and integrates it directly into the detector elements. The nanostructures enable direct phase-sensitive detection by interacting with the local electromagnetic field, extracting both amplitude and phase information in a single measurement step without requiring separate reference beams or interferometric setups
4Measurement precision
If micropolarization filter arrays with aluminum nanowires are used, then lateral field vector components can be imaged, but spatial resolution is limited by pixel spacing and polarization information is lost at incidence angles greater than 20°
Solution Approach 1:
The patent transitions from planar micropolarization filters to three-dimensional nanostructured detector elements with aperture tips and apertureless tips. These 3D structures provide angular insensitivity by maintaining their field component selection capability across a wide range of incidence angles, overcoming the 2D filter limitation where polarization information is lost at oblique angles
Solution Approach 2:
The detector elements use composite structures combining metallic tips (for plasmonic field enhancement and polarization selectivity) with dielectric or semiconductor waveguides (for signal transmission to sensor elements). This composite material approach enables both high spatial resolution and angular insensitivity by combining the advantages of different materials in a unified detector structure
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 solution allows for high-resolution, efficient detection of all field vector components in a radiation beam, significantly improving spatial resolution and measurement speed, enabling the recording of field vector components and phases in parallel, which is not achievable with conventional methods.
Implementation Method 1
detector structures being designed as metallic, mantle-shaped tips with different apices (ends of the tips) as nanostructures, to utilize an electromagnetic field distribution in the incident beam for polarization selection according to individual transverse and longitudinal field vector components Ex, Ey, Ez, based on the localized plasmon resonance (LPR) of the respective nanostructure
Implementation Method 2
localized surface plasmons (LSP) excited by LPR
Implementation Method 3
to transmit this polarization based on the propagation of surface plasmon polaritons (SPP)
Data Source
Figure 1
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AI summary
The invention relates to an assembly for detecting the intensity distribution of components of the electromagnetic field in beams of radiation. The problem addressed by the invention is solved according to the invention by combining a high-resolution two-dimensional intensity sensor array (1) and a field vector detector array (2), consisting of different regions (22, 23, 24) having individual detector structures (211, 212, 213) for two transverse and a longitudinal field vector component Ex, Ey, Ez, wherein the detector structures (211, 212, 213) metal jacket-shaped tips (3, 4) having different apices (33, 44) as nanostructures are designed to use localized localized plasmon resonance (LPR) of the individual detector structures (211, 212, 213) and localized surface plasmons (LSPs) excited by LPR for polarization selection of the field distribution according to field vector components Ex, Ey, Ez and to transfer the field distribution by means of surface plasmon polaritons (SPP) and wave guidance (WGM) to associated sensor elements (11).