Tunable Hyper-Spectral Focal Plane Array via Quantum Tunneling
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Solution Overview
Problem
Current hyper-spectral focal plane arrays (FPAs) face challenges in achieving multi- or hyper-spectral 2-dimensional imaging due to limitations in material growth, spectral resolution at the pixel level, and power dissipation, with existing technologies unable to continuously tune or program pixel levels for imaging.
Innovation Solution
The use of optical quantum tunneling photodetectors with variable bias voltage supplies allows for tunable spectral response, enabling continuous wavelength tuning and high spectral resolution through inter-quantum-well inter-subband tunneling, facilitating hyper-spectral imaging without the need for moving optical parts or filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current hyper-spectral FPA technologies (FTS or Push-broom radiometers with optical filters) are used to achieve multi- or hyper-spectral imaging, then spectral resolution is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent replaces mechanical/optical filtering systems (FTS or Push-broom radiometers with moving parts and filters) with a stationary FPA using quantum well photodetectors and spectral unmixing algorithms. This substitution eliminates moving optical parts while achieving comparable or superior spectral resolution through computational methods.
Solution Approach 2:
The patent makes a single FPA device perform multiple spectral detection functions simultaneously by enabling each pixel to detect multiple spectral bands through quantum well engineering and spectral unmixing algorithms, replacing the need for multiple specialized detectors or complex optical paths.
2Adaptability or versatility
If optical quantum tunneling photodetectors with variable bias voltage are used, then wavelength tuning capability is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic wavelength tuning capability in each photodetector pixel by applying variable bias voltages to adjust the energy spacing between quantum wells, allowing the detection wavelength to be dynamically adjusted without physical movement or filter changes.
Solution Approach 2:
The patent changes the electrical bias parameter to control the spectral response of photodetectors, where varying the voltage alters the quantum tunneling energy levels and thus the detected wavelength, providing a simple electrical control mechanism for spectral tuning.
3Measurement precision
If vertical integration of wavelength-selective QWIPs or HgCdTe detectors in 3D cube configuration is used, then spectral response is improved, but manufacturing difficulty and power dissipation increase
Solution Approach 1:
The patent transitions from planar 2D detector arrays to vertically integrated 3D quantum well structures, where multiple quantum wells are stacked in the vertical dimension to achieve spectral selectivity, enabling multi-color detection without requiring complex lateral arrangements.
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 wavelength and time-agile 2-dimensional focal-plane imaging with high spatial resolution and power efficiency, allowing for flexible spectral acquisition and simplified architecture, overcoming the limitations of existing FPAs.
Implementation Method 1
optical quantum tunneling photodetectors
Implementation Method 2
tunable spectral response, enabling continuous wavelength tuning and high spectral resolution through inter-quantum-well inter-subband tunneling
Data Source
AI summary
A voltage supply is connected to provide a variable bias voltage to a plurality of optical quantum tunneling photodetectors to thereby vary the spectral response of the photodetectors and thus detect radiation.