Optical Sensing Device Carbonized Sidewall Light Blocking
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Solution Overview
Problem
Conventional light sensing devices using bandpass filters suffer from poor wave filtering, leading to false signals and reduced sensing accuracy due to unwanted light entering the device.
Innovation Solution
The optical sensing device incorporates a bandpass filter layer and a carbonized sidewall to selectively allow specific wavelengths of light to pass through while blocking other wavelengths, thereby enhancing filtering efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a bandpass filter is used to selectively allow specific wavelength light to pass through, then light filtering capability is improved, but unwanted light still enters the device through sidewalls causing false signals
Solution Approach 1:
The filtering function is divided into two segments: the bandpass filter layer handles wavelength selection from above, while the carbonized sidewall structure handles blocking of unwanted wavelengths from the sides. This segmentation allows each component to specialize in blocking light from specific directions, thereby eliminating false signals without compromising the primary filtering function.
Solution Approach 2:
The carbonized sidewall acts as an intermediary blocking structure between the external environment and the optical acting area. It intercepts unwanted wavelengths before they can reach the optical acting area through the substrate sidewalls, serving as a mediating barrier that protects the detection accuracy without interfering with the primary bandpass filter function.
2Reliability
If traditional bandpass filter structure is used, then manufacturing process is simple, but filtering performance is insufficient leading to reduced sensing accuracy
Solution Approach 1:
The invention merges the bandpass filter layer with a carbonized sidewall structure into a single integrated device. The carbonized sidewall is formed by laser irradiation on the substrate surrounding the bandpass filter, combining two filtering functions (wavelength selection and side-blocking) into one unified structure. This merging improves sensing accuracy while avoiding the need for separate complex filtering components.
Solution Approach 2:
The carbonized sidewall is formed by changing the physical state of the substrate material through laser irradiation, transforming it into a carbonized structure with different optical properties. This parameter change (from unprocessed substrate to carbonized structure) enables the sidewall to block unwanted wavelengths effectively, enhancing filtering performance without adding mechanical 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 implementation of the bandpass filter layer and carbonized sidewall significantly improves the accuracy of light detection by effectively blocking external light, reducing false signals, and enhancing the overall sensing performance.
Implementation Method 1
The working principle of an optical bandpass filter is based on the interference and reflection of light
Implementation Method 2
it will enter the multi-layer thin film structure of the filter. At the material interface between the multi-layer film structures, the light will interfere and reflect
Implementation Method 3
the carbonized sidewall covers the sidewall of the filter layer and a portion of the sidewall of the substrate to prevent the light beams with the other wavelengths other than the specific wavelength from being received by the optical acting area through the sidewall of the substrate
Implementation Method 4
the carbonized sidewall is formed by irradiating the sidewall of the filter layer and the portion of the sidewall of the substrate with a high-energy laser beam
Implementation Method 5
the carbonized sidewall is formed by irradiating the sidewall of the filter layer and the portion of the sidewall of the substrate with a high-energy laser beam
Data Source
AI summary
An optical sensing device and a method for manufacturing the same are provided. The optical sensing device comprises a substrate, an optical acting area, a filter layer and a carbonized sidewall. The optical acting area is disposed on the substrate. The filter layer covers the optical acting area and selectively allows only a light beam with a specific wavelength to pass therethrough and be received by the optical acting area while blocking the light beams with other wavelengths. The carbonized sidewall covers the sidewall of the filter layer and a portion of the sidewall of the substrate to prevent the light beams with the other wavelengths from being received by the optical acting area through the sidewall of the substrate.