Single Coating Fluorescence Filter with Steep Edges
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Solution Overview
Problem
Conventional optical filters for fluorescence imaging face challenges with limited performance due to high losses and poor edge steepness, requiring multiple coating runs, which increases cost and results in poor brightness, contrast, and durability, especially in clinical microscopy applications where reliability and durability are critical.
Innovation Solution
A single coating with alternating high and low refractive index layers on a substrate, providing a wide passband with steep edges and extended blocking, achieved through precise ion-assisted ion-beam sputtering techniques, allowing for high transmissivity in the passband and effective blocking on either side without the need for multiple coatings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple thin-film coatings are used to provide extended blocking, then blocking performance is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent combines multiple blocking functions into a single coating layer by integrating a long-wave pass section and a short-wave pass section with different refractive index materials. This merging approach achieves extended blocking across both wavelength ranges while eliminating the need for multiple separate coating runs, thereby reducing manufacturing complexity while maintaining reliable blocking performance.
Solution Approach 2:
The patent employs composite coating structures using alternating layers of materials with different refractive indices (high index materials like TiO2, Ta2O5, Nb2O5 and low index materials like SiO2, MgF2). This composite material approach enables the single coating to achieve both long-wave and short-wave pass characteristics, providing extended blocking without requiring multiple coatings.
2Reliability
If more coating layers are deposited to achieve extended blocking, then blocking over broader wavelength range is improved, but transmission in the passband is reduced
Solution Approach 1:
The patent applies local quality by assigning different refractive index material sequences to different sections of the same coating. The long-wave pass section uses one alternating sequence of high and low index materials optimized for long wavelength blocking, while the short-wave pass section uses a different sequence optimized for short wavelength blocking. This localized optimization allows each section to perform its specific function efficiently while maintaining high transmission in the passband.
3Ease of manufacture
If conventional soft coatings are used to reduce cost, then manufacturing cost is reduced, but durability and reliability are worsened
Solution Approach 1:
The patent uses conventional soft coating materials (such as cryolite and zinc sulfide) that can be deposited in a single coating run, making the filter economically viable. While soft coatings are less durable than hard coatings, the single-coating approach reduces manufacturing complexity and cost significantly, making the filter suitable for applications where cost is a primary concern and the filter can be protected from harsh handling.
Solution Approach 2:
The patent merges the functions of multiple hard coatings into a single soft coating layer, achieving extended blocking performance without requiring multiple coating runs. This approach reduces the cumulative complexity and cost associated with multiple coatings while maintaining the protective and durable characteristics of soft coatings for fluorescence filter applications.
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 solution reduces costs, improves brightness and contrast, and enhances reliability and durability, enabling better performance in clinical microscopy by achieving high transmissivity and steep passband edges with extended blocking in a single coating layer.
Implementation Method 1
achieved through precise ion-assisted ion-beam sputtering techniques
Implementation Method 2
A single coating with alternating high and low refractive index layers on a substrate, providing a wide passband with steep edges and extended blocking
Implementation Method 3
The plurality of hard-coating layers includes alternating first and second layers. The first layers have a first refractive index, nL, and the second layers having a second refractive index, nH, greater than the first refractive index
Data Source
AI summary
Consistent with the present disclosure, a filter is provided by depositing a coating a substrate. The coating, which may include a plurality of hard-coating layers, has an associated transmission characteristic having a passband, as well as extended blocking.