Advancing Your Terahertz Vision

With a 50-year heritage of research and development, our optical components deliver unmatched performance and precision to support and stimulate the broad advance of terahertz technology.

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CTT is the global leader in terahertz (THz) frequency selective optical components. We offer an extensive catalogue of devices and a custom design service.

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Aerospace & Astronomy

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6G &
Telecom

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Security & Defence

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Scientific Research

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Medical
Imaging

Why CTT for Filters?

  • Unmatched performance and precision.
  • Ambient and cryogenic applications.
  • Trusted by global leaders in science & industry.
  • Bespoke consultancy service.

Latest News

CTT wins prestigious business award

CTT wins prestigious business award

Celtic Terahertz Technology Ltd. Wins Prestigious Institute Of Physics Business Award.

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Physicist honoured for outstanding work on revolutionary astronomical instruments and facilities

Physicist honoured for outstanding work on revolutionary astronomical instruments and facilities

A Cardiff University physicist has been awarded the 2024 Institute of Physics (IOP) James Joule Medal and Prize.

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Celebrating 50 Years of Scientific Exchange: IRMMW-THz 2026 Heads to Salt Lake City

Celebrating 50 Years of Scientific Exchange: IRMMW-THz 2026 Heads to Salt Lake City

The 2025, and 50th conference in the series, took place 17–22 August in Espoo, Finland. We look forward to the 51st in Salt Lake City.

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Bringing the Cosmos into Focus: New Astronomical Instrumentation Text by CTT Leaders Published

Bringing the Cosmos into Focus: New Astronomical Instrumentation Text by CTT Leaders Published

Two of CTT’s founders are co-authors of a definitive guide to astronomical instrumentation and techniques.

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