ATR in FTIR Spectroscopy | Silicon Wafers & ATR Crystals

High-Resistivity Silicon for ATR-FTIR Spectroscopy

UniversityWafer supplies high-resistivity silicon wafers and other infrared optical materials used in Attenuated Total Reflectance (ATR) FTIR spectroscopy. Our substrates are used by universities, research laboratories, and semiconductor manufacturers for surface characterization, thin-film analysis, MEMS research, infrared optics, and materials science. We offer custom wafer specifications to support ATR crystal fabrication and advanced spectroscopy applications.

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High-resistivity silicon wafers for ATR-FTIR applications
Single-side and double-side polished silicon substrates
Germanium (Ge), Zinc Selenide (ZnSe), sapphire, and quartz substrates
Custom crystal orientations and wafer thicknesses
Prime, test, and research-grade semiconductor wafers
Infrared optical materials for spectroscopy and photonics
Prototype quantities through production volumes

Recent Research Inquiry

"Our laboratory is developing an ATR-FTIR system to characterize thin dielectric films deposited on silicon wafers. We require high-resistivity, double-side polished silicon substrates with excellent surface quality for infrared spectroscopy measurements. Can you provide custom wafer thicknesses and orientations?"

UniversityWafer Response: We regularly supply high-resistivity silicon, germanium, ZnSe, sapphire, and other optical substrates for ATR-FTIR spectroscopy, infrared optics, semiconductor characterization, and advanced materials research.

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What Is ATR in FTIR Spectroscopy?

Attenuated Total Reflectance (ATR) is a sampling technique used with Fourier Transform Infrared (FTIR) spectroscopy to analyze the chemical composition of solid, liquid, and thin-film materials without extensive sample preparation. Instead of passing infrared light directly through a specimen, ATR uses a high-refractive-index crystal to generate an evanescent wave that penetrates only a few micrometers into the sample surface. This enables rapid, nondestructive surface characterization of wafers, coatings, polymers, semiconductors, and biological materials.

ATR in FTIR spectroscopy showing attenuated total reflectance, ATR crystal materials, and surface analysis of semiconductor wafers and thin films

How ATR-FTIR Works

In an ATR-FTIR system, infrared light enters an ATR crystal—commonly silicon, germanium (Ge), zinc selenide (ZnSe), or diamond—at an angle that produces total internal reflection. Each reflection creates an evanescent wave that extends slightly beyond the crystal surface into the sample. Molecules absorb specific infrared wavelengths based on their chemical bonds, producing an absorption spectrum that can be used to identify materials and evaluate surface chemistry.

Common ATR Crystal Materials

ATR Crystal	Typical Applications
Silicon	Semiconductor wafers, thin films, MEMS devices, infrared research
Germanium (Ge)	High-refractive-index materials, surface coatings, strongly absorbing samples
Zinc Selenide (ZnSe)	General FTIR analysis, polymers, liquids, organic materials
Diamond	Routine laboratory testing, hard materials, chemically resistant applications

Applications of ATR-FTIR

Semiconductor wafer characterization
Thin-film and dielectric coating analysis
Surface contamination detection
MEMS and microelectronics research
Polymer and composite material identification
Quality control in manufacturing
Pharmaceutical and biomedical research
Failure analysis and process monitoring

Why Silicon Is Used for ATR

High-resistivity silicon is widely used as an ATR crystal because it offers excellent infrared transmission within its operating wavelength range, high mechanical strength, and compatibility with semiconductor processing. Silicon ATR crystals are particularly valuable for analyzing semiconductor wafers, dielectric films, MEMS devices, and microfabricated structures where precise surface characterization is required.

UniversityWafer ATR Materials

UniversityWafer supplies high-resistivity silicon wafers along with germanium, zinc selenide (ZnSe), sapphire, quartz, and other infrared optical materials used in ATR-FTIR spectroscopy, semiconductor research, photonics, and advanced materials characterization. Custom sizes, orientations, thicknesses, and polished surfaces are available for research laboratories, universities, and industrial applications.

Related ATR-FTIR & Spectroscopy Resources

FTIR Spectroscopy – Learn the principles of Fourier Transform Infrared spectroscopy and its applications in materials characterization.
Silicon Wafers – Explore high-quality silicon wafers used for semiconductor fabrication, MEMS, photonics, and ATR crystal applications.
Germanium Wafers – High-refractive-index germanium substrates for ATR crystals, infrared optics, and detector research.
Zinc Selenide (ZnSe) Substrates – Infrared-transparent materials commonly used in ATR-FTIR optics and spectroscopy systems.
Sapphire Substrates – Durable optical substrates for spectroscopy, photonics, and high-temperature applications.
Quartz Wafers – Optical-grade quartz substrates for UV, visible, and infrared research applications.
Photonic Device Substrates – Materials for integrated optics, waveguides, lasers, and optical communication research.
Thin Film Deposition – Discover substrates used for dielectric, optical, and semiconductor thin-film research.
MEMS Silicon Wafers – Silicon substrates designed for microelectromechanical systems and sensor fabrication.
Silicon Wafer Processing – Learn about crystal growth, polishing, oxidation, etching, and semiconductor fabrication processes.
What Is a Wafer? – Understand how semiconductor wafers are manufactured and used in advanced electronic devices.

ATR in FTIR Spectroscopy for Surface and Thin-Film Analysis