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Planarization Layer Component – Computer, Electronic and Optical Product Manufacturing

Q: Why is planarization critical for micro-lens arrays?

Planarization eliminates surface irregularities that cause light scattering, ensuring uniform focal lengths and optical efficiency across thousands of micro-lenses.

Q: What materials work best for planarization layers?

Low-stress silicon dioxide and specialized optical polymers provide optimal smoothness, thermal stability, and refractive index matching for most applications.

Component Specifications

Definition

In micro-lens array fabrication, the planarization layer is a critical intermediate component deposited between lens elements or substrate layers to eliminate surface topography, reduce scattering losses, and ensure uniform optical performance across the array. This layer typically consists of polymer or dielectric materials with precise thickness control (50-500 nm) and optical properties matching the lens system requirements.

Working Principle

The planarization layer operates by filling surface irregularities through spin-coating or chemical vapor deposition, then curing to form a smooth optical interface. Its refractive index and thickness are engineered to minimize Fresnel reflections while maintaining mechanical stability during subsequent lithography and etching processes.

Materials

Polyimide, SU-8 photoresist, SiO₂, Si₃N₄, or specialized optical polymers with refractive indices between 1.45-1.65, thermal stability >200°C, and UV/visible light transparency >90%.

Technical Parameters

Thickness 100-300 nm
Refractive Index 1.46-1.62
Adhesion Strength >20 MPa
Surface Roughness <2 nm RMS
Thermal Expansion <20 ppm/°C

Standards

ISO 10110-7, ISO 14999-4, DIN 58141-2

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Planarization Layer.

Parent Products

This component is used in the following industrial products

Micro-lens Array

An array of microscopic lenses integrated onto the surface of an image sensor pixel array to focus incident light onto the photosensitive area of each pixel.

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Engineering Analysis

Risks & Mitigation

Delamination under thermal cycling
Optical inhomogeneity from uneven curing
Contamination during deposition

FMEA Triads

Trigger: Inadequate surface preparation
Failure: Poor adhesion and layer delamination
Mitigation: Implement plasma cleaning and adhesion promoters

Trigger: Non-uniform curing
Failure: Variable refractive index across surface
Mitigation: Use controlled thermal ramping and in-situ monitoring

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance

Thickness ±5%, refractive index ±0.005, surface roughness <2 nm

Test Method

Ellipsometry for thickness/refractive index, AFM for surface roughness, spectrophotometry for optical transmission

Buyer Feedback

★★★★☆ 4.8 / 5.0 (21 reviews)

"The technical documentation for this Planarization Layer is very thorough, especially regarding technical reliability."

"Reliable performance in harsh Computer, Electronic and Optical Product Manufacturing environments. No issues with the Planarization Layer so far."

"Testing the Planarization Layer now; the technical reliability results are within 1% of the laboratory datasheet."

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Frequently Asked Questions

Why is planarization critical for micro-lens arrays?