Metalens and Tetralateral Detector for Uniform Angle Sensing
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Solution Overview
Problem
Existing optical detector systems face challenges in achieving nonlinear optical performance similar to human vision, with lower resolution in the periphery and high resolution in near frontal illumination, while also requiring high sensitivity, high resolution, and high sample acquisition rates, and are often limited by blind spots and non-uniform response due to segmented photodiodes.
Innovation Solution
An optical detector system incorporating a metasurface with nanometer-scale structures and a tetralateral position sensing detector, which transforms incident light from both azimuth and elevation angles within a hemisphere to linear X-Y coordinates, providing a compact electro-optic package with improved response uniformity and faster response times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If segmented photodiodes are used to measure beam position, then position sensing capability is provided, but blind spots and non-uniform response occur due to gaps between segments
Solution Approach 1:
The patent merges multiple photodiode segments into a single continuous photodiode surface, eliminating the gaps that cause blind spots. The continuous surface ensures uniform light reception across the entire detector area, resolving the reliability issue while maintaining position sensing through the tetralateral electrode configuration.
2Measurement precision
If quadrant photodiode with narrow gap is used to measure beam position in two dimensions, then position monitoring is achieved, but the gap creates transition region perturbations and signal loss
Solution Approach 1:
The patent combines the functions of multiple photodiode segments into a single continuous photodiode with tetralateral electrodes, eliminating the narrow gaps that cause signal loss. The continuous surface ensures all light falls on active material, preventing information loss while maintaining 2D position monitoring through electrode signal differentiation.
3Speed
If segmented photodiode is used to achieve high speed position measurement, then fast response is obtained, but the gap between segments creates blind spots and reduces measurement accuracy
Solution Approach 1:
The patent merges photodiode segments into a continuous surface while maintaining fast response through the tetralateral electrode configuration. The continuous surface eliminates blind spots and ensures uniform light collection, improving measurement accuracy without sacrificing the speed advantage of the photodiode structure.
4Measurement precision
If conventional optical detector systems are used to achieve high resolution, then spatial resolution is improved, but the system size and fabrication complexity increase
Solution Approach 1:
The patent uses tetralateral electrodes positioned at the corners of a single photodiode segment to achieve high spatial resolution. This segmentation of the detection function across four electrodes enables precise position measurement without requiring multiple separate photodiode segments or complex multi-element structures, reducing overall device complexity.
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
The system achieves nonlinear optical performance, high sensitivity, and high resolution with lower fabrication costs, offering improved response uniformity and faster response times, similar to human vision, while maintaining compact size and cost-effectiveness.
Implementation Method 1
A metasurface is disposed on the opposite side of the window and has nanometer-scale structures patterned on the window to impart spatially varying optical phase delay and/or amplitude modulation onto the incident light rays
Implementation Method 2
The metasurface turns each incident light ray a different amount depending upon the angle of incidence of the incident light ray and creates exiting light rays
Implementation Method 3
a two-dimensional tetralateral position sensing detector having a single resistive layer and four separate electrodes, the tetralateral position sensing detector receiving the exiting light rays from the metasurface and generating an X-Y position signal
Data Source
AI summary
An optical detector system providing electrical output signals. The system includes an apertured surface and a transparent window, with a metasurface on the window's opposite side. The metasurface imparts spatially varying phase delay and/or amplitude or polarization modulation to deflect ILR based on their angle of incidence, producing exiting light rays. These rays are detected by a two-dimensional tetralateral position-sensing detector (TLD) with a single resistive photo-absorption layer and four electrodes. The TLD generates X-Y position signals proportional to the azimuth and elevation of the incoming ILR. A computer may be included to calculate these angular values from the position signals.