Infrared Emitter Back-to-Back Junctions for Spectral Polarization Control
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Solution Overview
Problem
Mid-infrared light emitters require multiple optical and mechanical components to modulate spectral characteristics and polarization, leading to high costs and limited system miniaturization, and face issues with lattice and thermal mismatches in semiconductor processes, with the light being non-characteristically polarized and requiring a multi-layer structure with multiple electrodes.
Innovation Solution
An infrared light emitter is designed with a substrate, first and second light-emitting layers, and a blocking layer forming P-N-P or N-P-N junctions, allowing for modulation of optical characteristics like wavelength, spectrum, and polarization through bias voltage, and facilitating miniaturization by reducing the number of required components and addressing lattice mismatches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple optical and mechanical components are used to modulate spectral characteristics and polarization, then the spectral and polarization control capability is improved, but the device complexity and cost increase, and system miniaturization is limited
Solution Approach 1:
The patent combines multiple light-emitting layers with different emission characteristics (wavelength, polarization) into a single integrated emitter device. The first and second light-emitting layers are stacked vertically with a blocking layer between them, allowing both spectral and polarization modulation functions to be merged into one component, eliminating the need for separate optical components.
Solution Approach 2:
The light emitter is designed to provide multiple functions simultaneously: it can emit light at different wavelengths (spectral modulation) and control polarization states through the same device structure. The first light-emitting layer provides one set of optical properties while the second light-emitting layer provides another, making the single device universal for both spectral and polarization control applications.
2Ease of manufacture
If semiconductor processes are used to fabricate the light emitter, then the manufacturing capability is improved, but lattice mismatch and thermal property mismatch problems occur
Solution Approach 1:
The patent employs a composite structure consisting of multiple light-emitting layers and a blocking layer, where each layer can be made from materials optimized for its specific function. This composite approach allows selection of materials that minimize lattice mismatch and thermal property issues while maintaining manufacturability through established semiconductor fabrication processes.
3Ease of operation
If a multi-layer structure with more than three electrodes is used to independently control each electroluminescent unit, then the independent control capability is improved, but the device complexity increases
Solution Approach 1:
The patent merges the control of multiple electroluminescent units into a simplified electrode configuration. By using only three electrodes (anode, cathode, and one additional control electrode), the device achieves independent control of the first and second light-emitting layers, eliminating the need for more complex multi-electrode structures while maintaining independent control capability.
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 solution enables independent control of electroluminescent units, modulates infrared light emission properties, and achieves miniaturization of the light emitter, with adjustable polarization and wavelength, and high quantum efficiency up to 0.3%, simplifying optical components and enhancing system performance.
Implementation Method 1
The first light-emitting layer and the blocking layer form a first electroluminescent unit, and the second light-emitting layer and the blocking layer form a second electroluminescent unit
Implementation Method 2
The blocking layer is disposed between the first light-emitting layer and the second light-emitting layer, and the first light-emitting layer, the blocking layer, and the second light-emitting layer form a P-N-P junction or an N-P-N junction
Data Source
AI summary
An infrared light emitter includes a substrate, a first light-emitting layer, a blocking layer, and a second light-emitting layer. The second light-emitting layer is disposed on the substrate, the blocking layer is disposed on the second light-emitting layer, and the first light-emitting layer is disposed on the blocking layer. The first light-emitting layer, the blocking, and the second light-emitting layer form a P-N-P junction or an N-P-N junction. The first light-emitting layer and the blocking layer form a first electroluminescent unit, and the blocking layer and the second light-emitting layer form a second electroluminescent unit. The first electroluminescent unit and the second electroluminescent unit build two back-to-back bipolar junctions.