Terahertz Filters
Band pass BPF · Band stop BSF · Low pass LPF · High pass HPF
Band pass, band stop, low pass and high pass filters for terahertz. Peak transmission > 70 %, typically > 90 %. Central frequency held to < 5 %, customizable to < 1 %, and bandwidth < 30 %, customizable to < 1 %. Sizes up to 150 mm, from 100 Euro for a 10 mm Type I.
Lead time on request
Online prices are for budgetary purposes only. Exact prices can be up to 20% higher depending on the current exchange rate — please request a formal quotation.
Four filter families, all metal mesh: **band pass (BPF)** for isolating one line, **band stop (BSF)** for rejecting one, **low pass (LPF)** for cutting everything above a frequency, and **high pass (HPF)** for cutting everything below it. Peak transmission is above 70 % and typically better than 90 %.
Centre frequency is held to within 5 % as standard and can be specified to better than 1 %; bandwidth is under 30 % as standard and can be narrowed below 1 %. Clear apertures run to 150 mm. Anything outside the standard range is made to order — tell us the frequency, the width and the aperture you need.
Every curve in the figures below is a measurement, not a model. The low-pass data was taken on a Perkin-Elmer FTIR spectrometer with each sample scan ratioed against its own open-beam reference; where a second trace appears above the filter curve, that is the reference.
- ▸ **Low pass, 3 THz type** — measured half-power cut-off **3.0 THz**, passband 87 %, blocking 1.4 % (−18.5 dB) median from 3.6 to 24 THz.
- ▸ **Low pass, 20 THz type** — measured half-power cut-off **21.5 THz**, passband 83 %, blocking 0.5 % median from 23 to 30 THz.
- ▸ Filter designations below are nominal. The measured cut-off of a mesh filter sits a little above the name it is sold under; both numbers are given so there is no ambiguity.
Choose your specification — the model number and price appear immediately.
| Peak transmission | > 70 % Typ. > 90 % |
|---|---|
| Tolerance in central frequency | < 5 % customizable < 1 % |
| Bandwidth | < 30 %. Customizable < 1 % |
| Size | up to 150 mm |
| Type I | Band pass (BPF) | < 3 THz | 10 mm — 100 Euro · 19 mm — 400 Euro · > 19 mm — contact |
| Type II | Band pass (BPF) | 3 – 30 THz | Contact |
| Type III | Band pass (BPF), high rejection | — | Contact |
| Type IV | Low pass (LPF) | measured examples at 3, 9.5 and 20 THz | Contact |
| — | Band stop (BSF) | made to order | Contact |
| — | High pass (HPF) | made to order | Contact |
The filters
Low pass (LPF)
Band pass (BPF)
Rigi Camera
Organic Crystals (Emitters)
THz Detector Crystals
