Nano Antenna Image Sensor Layers for Band Crosstalk Reduction
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Solution Overview
Problem
Stacked image sensors face high crosstalk issues between different color detection signals due to light absorption, particularly between long-wavelength and short-wavelength light detection, which affects image quality and low-light photography performance.
Innovation Solution
The use of nano antenna layers arranged in an overlapping manner, where each nano antenna generates resonance for incident light of specific bands or polarizations, enhancing light absorption and reducing crosstalk by utilizing a plasmon effect, and optionally incorporating a selection layer to filter light between layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a stacked multi-color pixel structure is used to improve resolution and photosensitivity, then light absorption capability is enhanced, but crosstalk between different wavelength bands increases
Solution Approach 1:
The photosensitive layer is divided into multiple independent photosensitive sub-layers, each dedicated to detecting specific wavelength bands. This segmentation allows each sub-layer to independently absorb light in its designated band without interference from other bands, thereby reducing crosstalk while maintaining overall light absorption capability.
Solution Approach 2:
Different regions of the stacked pixel structure are assigned different optical properties and absorption characteristics. Each photosensitive sub-layer is optimized for specific wavelength ranges, creating local quality variations that enable selective light absorption and minimize inter-band crosstalk while preserving photosensitivity.
2Use of energy by moving object
If the photosensitive layer thickness is increased to improve light absorption, then photosensitivity is enhanced, but crosstalk between adjacent color bands increases
Solution Approach 1:
The thick photosensitive layer is segmented into multiple thinner sub-layers stacked vertically, each optimized for specific wavelength absorption. This segmentation maintains adequate thickness for light absorption in each band while preventing excessive penetration and crosstalk between adjacent color bands through the layering structure.
Solution Approach 2:
The solution transitions from a single-dimensional thick layer to a multi-dimensional stacked structure. By distributing the absorption function across multiple vertical layers rather than relying on a single thick layer, the structure achieves adequate photosensitivity while reducing horizontal crosstalk between color bands through the vertical dimension.
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 improves light utilization and reduces crosstalk between different bands, resulting in higher image quality and clearer images, even in low-light conditions, by enhancing the absorption of incident light and minimizing unwanted light intake.
Implementation Method 1
The nano antenna includes a material that can generate a plasmon signal with light. The at least one nano antenna is configured to generate resonance for incident light to generate a plasmon signal.
Implementation Method 2
The at least one nano antenna is configured to generate resonance for incident light.
Data Source
AI summary
The technology of this application relates to an image sensor and an electronic device, to increase photosensibility, improve utilization of light that is incident to the image sensor, and reduce crosstalk between bands. The image sensor includes at least one photosensitive pixel. Each photosensitive pixel includes a plurality of nano antenna layers. The plurality of nano antenna layers are arranged in an overlapping manner. Each nano antenna layer includes at least one nano antenna. The at least one nano antenna is configured to generate resonance for incident light. Different nano antenna layers generate resonance for incident light of different bands or different polarization directions. An output signal of the nano antenna layers is used to obtain an image.