Optical Filter Structure to Suppress Metal Film Migration
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Solution Overview
Problem
Existing light detection devices face reliability issues due to metal film migration, which affects the accuracy and longevity of multispectral light detection across various wavelength bands.
Innovation Solution
A light detection device incorporating a metal film with openings smaller than the incident light wavelength and barrier metals on the corners of the filter to prevent metal film migration, while maintaining plasmon resonance for selective wavelength detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal film is used as a filter for multispectral light detection, then plasmon resonance can be achieved for selective wavelength detection, but metal film migration occurs which reduces device reliability
Solution Approach 1:
A barrier metal layer is introduced as an intermediary between the metal film and the substrate. This barrier metal prevents direct interaction between the metal film and substrate, thereby suppressing metal film migration while allowing the metal film to maintain its plasmon resonance properties for light detection
Solution Approach 2:
The filter structure is transformed from a single metal film into a composite structure consisting of a metal film combined with a barrier metal layer. This composite structure leverages the plasmon resonance properties of the metal film while utilizing the migration-resistant properties of the barrier metal to improve overall stability
2Reliability
If the metal film is made thinner to reduce migration, then reliability improves, but plasmon resonance effectiveness decreases
Solution Approach 1:
The barrier metal serves as a mediator that enables the use of thinner metal films without compromising reliability. It provides structural support and prevents migration, allowing the metal film thickness to be reduced while maintaining both reliability and plasmon resonance effectiveness
3Reliability
If barrier metal is added to prevent migration, then reliability improves, but device complexity increases
Solution Approach 1:
The barrier metal is applied selectively only at critical locations where migration is most likely to occur, rather than covering the entire metal film. This localized approach prevents migration and improves reliability while minimizing the increase in device 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 solution effectively suppresses metal film migration, enhancing the reliability and accuracy of light detection across multiple spectral bands, thereby improving the device's performance and longevity.
Implementation Method 1
detects light of four or more wavelength bands (four or more bands) (multiple spectra) by means of surface plasmons
Implementation Method 2
a photoelectric converter that converts light entering through the filter into an electric charge
Data Source
AI summary
A light detection device of an embodiment of the present disclosure includes: a filter including a metal film provided with a plurality of openings each having a size equal to or less than a wavelength of incident light; a barrier metal provided on a corner of the filter, and a photoelectric converter that converts light entering through the filter into an electric charge.