Optical Modulator Pixelization Trenches for Crosstalk Reduction
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Solution Overview
Problem
Semiconductor-based optical modulators face resolution degradation due to electric interference between pixels, leading to image blur and reduced structural rigidity, especially when fabricated on GaAs substrates.
Innovation Solution
Incorporating trenches of varying depths and shapes within the optical modulator to block or reduce electric interferences between pixels, combined with transparent electrodes and a semiconductor substrate for efficient signal transfer, thereby preventing electron diffusion in the transverse direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If semiconductor-based O-E-O modulators are used to reduce size and cost, then manufacturing efficiency and compactness are improved, but electric interference between pixels causes resolution degradation
Solution Approach 1:
The semiconductor substrate is divided into isolated pixel regions by forming trenches between adjacent pixels. This segmentation prevents electric field interference and electron diffusion between pixels, thereby maintaining high image resolution while using semiconductor fabrication processes.
Solution Approach 2:
Trenches filled with insulating material are introduced as intermediary structures between pixels. These trenches act as electric field barriers and electron diffusion blockers, resolving the interference problem without compromising the semiconductor-based manufacturing approach.
2Manufacturing precision
If trenches are formed to block electric interference between pixels, then image resolution is improved, but structural rigidity of the semiconductor substrate deteriorates
Solution Approach 1:
The trenches are formed with optimized dimensions (depth, width, and spacing) to provide sufficient electric isolation locally at each pixel boundary while maintaining overall substrate integrity. The trench depth is controlled to extend only partially through the substrate thickness, providing local electric field blocking without compromising global structural rigidity.
3Manufacturing precision
If trenches are formed deeply into the substrate to effectively block electric interference, then pixel crosstalk is reduced, but fabrication complexity and cost increase
Solution Approach 1:
The trenches are formed to a depth that is sufficient to block the relevant electric field interference and electron diffusion paths, but not necessarily through the entire substrate thickness. This partial action achieves the required pixel isolation while simplifying fabrication compared to complete through-substrate trenching.
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 effectively enhances image resolution by minimizing pixel crosstalk, maintaining structural integrity, and simplifying electric wiring, while improving the overall performance of the optical modulator.
Implementation Method 1
an optical-electric (O-E) conversion element converting input optical images to current signals using the photoelectric effect
Implementation Method 2
an electric-optical (E-O) conversion element that emits light using the current signals transferred from the O-E conversion element
Data Source
AI summary
Provided is an optical modulator having pixelization patterns. The optical modulator includes an optical-electric (O-E) conversion element converting input optical images to current signals using the photoelectric effect, and an electric-optical (E-O) conversion element that emits light using the current signals transferred from the O-E conversion element. Trenches are formed from at least a surface of the optical modulator to a predetermined depth in the optical modulator so as to block or reduce electrical interference between pixels when the electric signals are transferred from the O-E conversion element to the E-O conversion element.