What Substrates for Terahertz (ThZ) Research and Development 

Terahertz (THz) research substrates play a critical role in THz generation, detection, spectroscopy, imaging, communications, and optical systems. UniversityWafer supplies high-resistivity silicon wafers, float zone silicon, ZnTe, GaP, quartz, sapphire, MgO, and other specialty materials used in terahertz beam splitters, THz optics, electro-optic detection, and advanced photonics research.

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High-Resistivity Silicon Beam Splitters for THz Applications

High-resistivity silicon wafers are widely used as beam splitters, optical windows, and transmission components in terahertz (THz) systems. Their low absorption losses, excellent transmission characteristics, and compatibility with precision optical polishing make them ideal for THz spectroscopy, imaging, sensing, and communications research.

A recent Ph.D. researcher requested a custom silicon beam splitter for terahertz measurements with the following specifications:

THz Beam Splitter Request:

50:50 silicon beam splitter with optically polished surfaces, resistivity greater than 10 kΩ-cm, dimensions approximately 34 mm × 29 mm, and thickness between 1.5 mm and 6 mm for terahertz measurement applications.

Reference #213809 for specifications, pricing, and availability.

Request a Fast Quote for THz Silicon Beam Splitters or Buy Online and Start Researching Today .





300mm High-Resistivity Silicon Wafers for THz Measurements

Many terahertz measurement systems require high-resistivity silicon wafers to minimize free-carrier absorption and maximize signal transmission. Researchers often specify resistivities greater than 1 kΩ-cm for THz characterization, spectroscopy, and semiconductor device testing.

Research Request:

300 mm diameter silicon wafers, <100> orientation, resistivity greater than 1 kΩ-cm, with either p-type or n-type doping acceptable for THz measurement applications.

Reference #214438 for specifications and pricing.

Cadmium Telluride (CdTe) and ZnTe for THz Detection

Cadmium Telluride (CdTe) and Zinc Telluride (ZnTe) are frequently evaluated for terahertz electric-field sensing and electro-optic detection systems. While ZnTe remains one of the most commonly used materials for THz pulse measurements, CdTe may also be considered for specialized sensing applications depending on crystal orientation and device requirements.

Researchers often compare CdTe and ZnTe substrates when developing electro-optic sampling systems, THz detectors, and ultrafast photonics experiments.

Reference #224665 for specifications and pricing.

Float Zone Silicon Wafers for THz Optics

Float Zone (FZ) silicon wafers are among the highest-purity silicon substrates available and are widely used in THz optics, spectroscopy systems, beam splitters, and transmission measurements. Their extremely low impurity concentrations and high resistivity provide excellent terahertz transmission performance.

Research Request:

25.4 mm diameter high-resistivity silicon wafer, 100 µm thickness, for terahertz optical applications with no specific crystal orientation requirement.

Reference #225149 for specifications and pricing.

UniversityWafer supplies high-resistivity silicon wafers, float zone silicon, ZnTe, GaP, quartz, sapphire, and other specialty substrates used in terahertz generation, detection, spectroscopy, imaging, and optical research.

Gallium Phosphide (GaP) Wafers for THz Generation and Detection

Gallium Phosphide (GaP) wafers are widely used in terahertz (THz) generation and detection systems because of their excellent electro-optic properties, high optical transparency, and compatibility with ultrafast laser technologies. GaP crystals are frequently selected for THz spectroscopy, THz imaging, and advanced photonics research.

Research Request:

0.5 mm thick GaP <110> wafers for terahertz generation and detection applications. Quantity requested: 5 pieces.

Reference #312532 for specifications, pricing, and availability.

What Materials Are Used for Terahertz (THz) Applications?

THz measurements using a high resistivity silicon wafer Terahertz radiation occupies the frequency range between microwaves and infrared light, typically from 0.1 THz to 10 THz. This portion of the electromagnetic spectrum is increasingly important for security screening, non-destructive testing, wireless communications, pharmaceutical analysis, semiconductor characterization, spectroscopy, and medical imaging.

The performance of THz systems depends heavily on the substrate material selected for generation, transmission, detection, and optical manipulation of terahertz waves. Different materials offer unique electrical, optical, and thermal properties that make them suitable for specific THz applications.

High-Resistivity Silicon Wafers for THz Optics

High-resistivity silicon wafers are among the most commonly used materials in terahertz research. Their low absorption losses and excellent transmission characteristics make them ideal for THz lenses, beam splitters, optical windows, spectroscopy systems, and semiconductor measurement equipment.

High-resistivity float-zone silicon is particularly valuable for THz optics because it minimizes free-carrier absorption and provides superior performance across a broad terahertz frequency range.

Quartz and Sapphire for THz Transmission

Quartz substrates offer excellent transparency and low absorption in the terahertz range, making them useful for THz spectroscopy and optical research.

Sapphire wafers provide a wide optical transmission range extending from ultraviolet wavelengths through terahertz frequencies. Their mechanical durability and thermal stability make them suitable for demanding THz applications.

ZnTe and GaP for Electro-Optic THz Detection

Zinc Telluride (ZnTe) and Gallium Phosphide (GaP) are widely used in electro-optic sampling systems for terahertz wave detection. Their strong electro-optic coefficients enable highly sensitive measurement of THz electric fields and ultrafast pulse characterization.

These materials are frequently used in terahertz time-domain spectroscopy (THz-TDS) systems and advanced photonics laboratories.

Photoconductive Antenna Materials for THz Devices

THz photoconductive antennas commonly utilize low-temperature-grown Gallium Arsenide (LT-GaAs) and related compound semiconductor materials. When illuminated by ultrafast laser pulses, these materials rapidly generate or detect terahertz radiation.

Alternative materials such as Indium Gallium Arsenide (InGaAs) are also used for specialized THz systems operating at telecommunications wavelengths.

Additional Materials Used in Terahertz Research

Researchers may also utilize specialty materials including:

  • Magnesium Oxide (MgO)
  • Organic nonlinear crystals such as DAST and DSTMS
  • Polyethylene and Teflon optics
  • Zeonex THz optical components
  • Cadmium Telluride (CdTe)
  • Specialized semiconductor and photonic substrates

Because THz generation, transmission, detection, and spectroscopy often require different material properties, selecting the optimal substrate depends on the specific terahertz application and performance requirements.

Related THz Research Substrates and Materials