Terahertz Optical Element Cycloolefin Antireflection Film Adhesion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing optical elements for terahertz waves using epoxy-based polymers as antireflection films face issues with wave absorption and poor adhesion to silicon surfaces, leading to suboptimal transmittance and reliability.
Innovation Solution
An optical element with an antireflection film composed of a cycloolefin-based polymer and inorganic particles, bonded to a silicon surface using a thermally denatured olefin-based polymer adhesive layer, which enhances adhesion and maintains high transmittance while preventing wave absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an epoxy-based polymer is used as the main component of the antireflection film, then the antireflection film adheres well to the silicon substrate, but the polymer absorbs terahertz waves, reducing transmittance
Solution Approach 1:
The patent changes the material parameter from epoxy-based polymer to cycloolefin-based polymer, which fundamentally alters the interaction with terahertz waves. The cycloolefin-based polymer has different molecular structure and electromagnetic properties that result in reduced wave absorption while maintaining appropriate adhesion characteristics when combined with the thermally denatured olefin-based polymer adhesive layer.
Solution Approach 2:
The patent creates a composite structure consisting of three components: cycloolefin-based polymer (antireflection function), thermally denatured olefin-based polymer (adhesion function), and inorganic particles (refractive index adjustment). This composite approach allows each component to specialize in one function, resolving the contradiction between adhesion and wave absorption.
2Loss of energy
If a cycloolefin-based polymer is used as the main component of the antireflection film, then the transmittance with respect to terahertz waves is improved, but the adhesiveness with respect to silicon becomes poorer
Solution Approach 1:
The patent divides the antireflection film into two separate functional layers: the cycloolefin-based polymer layer provides antireflection and high transmittance properties, while the thermally denatured olefin-based polymer layer provides adhesion to the silicon substrate. This segmentation allows each layer to optimize its specific function without compromise.
Solution Approach 2:
The thermally denatured olefin-based polymer acts as an intermediary layer between the silicon substrate and the cycloolefin-based polymer antireflection film. This intermediate layer bridges the adhesion gap, enabling the cycloolefin-based polymer to maintain its superior transmittance properties while achieving reliable bonding to the silicon substrate through the mediator's adhesive properties.
3Reliability
If the adhesive layer is made thicker to improve bonding, then adhesion is enhanced, but terahertz wave absorption increases
Solution Approach 1:
The patent changes the chemical and physical parameters of the olefin-based polymer through thermal denaturation. This treatment modifies the polymer's molecular structure, surface properties, and adhesive characteristics, enabling strong bonding to silicon at minimal thickness. The thermal denaturation process creates a material that achieves maximum adhesion efficiency with minimum thickness, thereby minimizing wave absorption.
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 provides an optical element with improved transmittance and reliability by ensuring effective bonding of the antireflection film to the silicon surface, reducing wave reflection and absorption, and allowing for adjustable refractive indices to optimize terahertz wave transmission.
Implementation Method 1
the adhesive layer includes a thermally denatured olefin-based polymer
Implementation Method 2
an antireflection film including an organic resin including a cycloolefin-based polymer as a main component, and inorganic particles dispersed in the organic resin
Data Source
AI summary
An optical element for terahertz waves includes: an optical component including a silicon surface, an antireflection film including an organic resin including a cycloolefin-based polymer as a main component, and inorganic particles dispersed in the organic resin; and an adhesive layer located between the optical component and the antireflection film in a thickness direction of the antireflection film and bonding the silicon surface of the optical component and the antireflection film to each other. The adhesive layer includes a thermally denatured olefin-based polymer.