Spectroscopic Ellipsometry (SE) Guide – Principles & Applications
Spectral ellipsometry (SE) measures how polarized light changes when it reflects off a material surface — and from those changes, you can extract thin film thickness down to sub-nanometer resolution, refractive index (n), extinction coefficient (k), and layer uniformity across UV to infrared wavelengths. It's non-destructive, non-contact, and works on single and multilayer structures including oxides, nitrides, polymers, photoresists, and transparent conducting films. Lab performs SE characterization for semiconductor process control, optical coating qualification, solar cell layer analysis, and advanced materials research.
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- Overview
- Scope, Applications, and Benefits
- Test Process
- Specifications
- Results and Deliverables
Spectral Ellipsometry (SE) Testing Overview
Spectral ellipsometry (SE) is a non-destructive optical technique used to characterize thin films and surfaces by measuring changes in the polarization state of light reflected from a material. It provides highly sensitive analysis of thickness and optical properties without physical contact with the sample.
The technique uses a broad spectrum of light across UV, visible, and infrared wavelengths to extract detailed information about film structure. By modeling the interaction of polarized light with the material, SE enables accurate determination of refractive index, extinction coefficient, and layer thickness, even at sub-nanometer scales.
Scope, Applications, and Benefits
Scope
Spectral ellipsometry evaluates:
- Thin film thickness (nm to µm range)
- Optical constants (refractive index n, extinction coefficient k)
- Surface and interface roughness
- Layer composition and uniformity
- Multilayer film structure
Applications
- Semiconductor and microelectronics
- Thin film coatings and optics
- Solar cells and photovoltaic materials
- Polymers and dielectric materials
- Nanotechnology and advanced materials
Benefits
- Non-destructive and non-contact measurement
- Extremely high sensitivity for ultra-thin films
- Simultaneous measurement of thickness and optical properties
- Suitable for multilayer and complex structures
- High accuracy and repeatability
Spectral Ellipsometry Test Process
Sample Preparation
Sample surface is cleaned and positioned on the measurement stage.
1Light Incidence
Polarized light is directed at the sample at an oblique angle.
2Measurement
Change in polarization (Ψ and Δ parameters) is recorded across wavelengths.
3Data Analysis
Optical models are applied to extract thickness, refractive index, and film properties.
4Spectral Ellipsometry Technical Specifications
| Parameter | Details |
|---|---|
| Test Principle | Measurement of polarization change of reflected light |
| Spectral Range | ~193 nm to 35 µm (UV–IR range) |
| Thickness Range | ~1 Å to >25 µm |
| Measurement Parameters | Ψ (amplitude ratio), Δ (phase difference) |
| Measured Outputs | Film thickness, n, k, dielectric properties |
- Spectroscopic ellipsometer
- Broadband light source (UV–Vis–IR)
- Polarizer and analyzer system
- Detector and spectrometer
- Sample stage with angle control
- Data modeling and analysis software
Results and Deliverables
- Thin film thickness measurements
- Optical constants (n and k values)
- Surface and interface characterization
- Multilayer structure analysis
- Material composition and uniformity data
- Test report
Partnering with Infinita Lab for Optimal Results
Infinita Lab addresses the most frustrating pain points in the spectral ellipsometry testing process: complexity, coordination, and confidentiality. Our platform is built for secure, simplified support, allowing engineering and R&D teams to focus on what matters most: innovation. From kickoff to final report, we orchestrate every detail—fast, seamlessly, and behind the scenes.
Looking for a trusted partner to achieve your research goals? Schedule a meeting with us, send us a request, or call us at (888) 878-3090 to learn more about our services and how we can support you. Request a Quote
Frequently Asked Questions
Spectral ellipsometry is a non-destructive optical technique used to measure thin film thickness and optical properties by analyzing how polarized light changes upon reflection from a material surface.
The technique measures Ψ (amplitude ratio) and Δ (phase difference), which are used to calculate film thickness, refractive index, extinction coefficient, and other optical properties of materials.
Materials such as semiconductors, thin films, coatings, polymers, dielectrics, and nanomaterials can be analyzed, especially when precise thickness and optical characterization are required.
It provides highly accurate, non-contact measurement of thin film properties, enabling advanced material characterization, process control, and optimization in industries like electronics, optics, and energy.
Unlike many methods, SE can simultaneously measure thickness and optical properties with very high sensitivity, even for ultra-thin layers, making it ideal for complex multilayer systems and nanomaterials.
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