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Domestic High-Quality THz Band Pass Filter
1. Product Introduction
The THz Band Pass Filter is a high-performance device specifically designed for the terahertz frequency range, effectively addressing the challenging filtering requirements in this band. Utilizing a specially engineered perforated metal film structure, it achieves precise filtering in the terahertz region. With features such as narrow bandwidth, high transmittance, and excellent out-of-band suppression, the filter also offers significant advantages including large aperture, compact design, and lightweight construction, providing reliable technical support for terahertz imaging, spectroscopic analysis, and communication systems.
The filter is made of a series of specially designed perforated metal films, with the structure and dimensions of the holes determined by the desired frequency point. Custom center frequencies can be tailored according to specific application requirements, with a selectable range covering 0.3 THz to 7 THz. These metal films are mounted on metallic rings inside a cylindrical metal housing, which is constructed from aluminum alloy and anodized with a black finish. To prevent contamination and physical damage, both sides are coated with white or transparent polymer film, ensuring sufficient effective light transmission area while effectively improving the device's signal-to-noise ratio. The effective light aperture comes in two standard configurations: circular aperture with outer diameters of Φ54 mm / Φ64 mm, and square aperture with outer dimensions of 60 mm × 60 mm / Φ100 mm (all sizes customizable). Additionally, this product supports personalized customization of the light aperture to meet demanding requirements for special optical paths or higher energy flux. Clear product labels are affixed to the exterior surface, indicating key information such as model number and center frequency.
Fig.1 Sample physical picture
2. Technical parameters and test data
● Center Frequency Vmax：0.3THz~7THz
● Peak Transmittance：>80%
● Relative Bandwidth：10%~20%
● Out-Of-Band Suppression Ratio：<5E-4
Fig.2 Measurement of spectral transmittance of THz Band Pass Filters
Fig.3 Low-cost, single-layer filter performance test
Product Model
| Product Name | Product model | Central wavelength(THZ) | Relative Bandwidth | Peak Transmittance | Out-Of-Band Spectral Transmittance |
| THz Band Pass Filter | THz-BPF-CF1-BW15 | 1 | 15% | ＞80% | ≤5E-4 |
| THz Band Pass Filter | THz-BPF-CF1-BW20 | 1 | 20% | ＞80% | ≤3E-3 |
| THz Band Pass Filter | THz-BPF-CF1.3-BW15 | 1.3 | 15% | ＞80% | ≤5E-4 |
| THz Band Pass Filter | THz-BPF-CF1.3-BW20 | 1.3 | 20% | ＞80% | ≤3E-3 |
| THz Band Pass Filter | THz-BPF-CF1.6-BW15 | 1.6 | 15% | ＞80% | ≤5E-4 |
| THz Band Pass Filter | THz-BPF-CF1.6-BW20 | 1.6 | 20% | ＞80% | ≤3E-3 |
| THz Band Pass Filter | THz-BPF-CF2-BW15 | 2 | 15% | ＞80% | ≤5E-4 |
| THz Band Pass Filter | THz-BPF-CF2-BW20 | 2 | 20% | ＞80% | ≤3E-3 |
| THz Band Pass Filter | THz-BPF-CF2.6-BW15 | 2.6 | 15% | ＞80% | ≤5E-4 |
| THz Band Pass Filter | THz-BPF-CF2.6-BW20 | 2.6 | 20% | ＞80% | ≤3E-3 |
| THz Band Pass Filter | THz-BPF-CF3-BW15 | 3 | 15% | ＞80% | ≤5E-4 |
| THz Band Pass Filter | THz-BPF-CF3-BW20 | 3 | 20% | ＞80% | ≤3E-3 |
| THz Band Pass Filter | THz-BPF-CF4.1-BW15 | 4.1 | 15% | ＞80% | ≤5E-4 |
| THz Band Pass Filter | THz-BPF-CF4.1-BW20 | 4.1 | 20% | ＞80% | ≤3E-3 |
| THz Band Pass Filter | THz-BPF-CF5.4-BW15 | 5.4 | 15% | ＞80% | ≤5E-4 |
| THz Band Pass Filter | THz-BPF-CF5.4-BW20 | 5.4 | 20% | ＞80% | ≤3E-3 |
| THz Band Pass Filter | THz-BPF-CF6-BW15 | 6 | 15% | ＞80% | ≤5E-4 |
| THz Band Pass Filter | THz-BPF-CF6-BW20 | 6 | 20% | ＞80% | ≤3E-3 |
3. Customized Service
● The circular light aperture can be customized to the maximum size：Φ64 mm
● Square light aperture can be customized to the maximum size：64mm×64mm
● Center frequency customization：0.3THz ~ 7THz are available options. Generally, we have in stock band pass filters with frequencies such as 1THz, 2THz, 2.6THz, 4.1THz, 5.4THz, and 6THz. Other specifications can be customized according to your requirements.
Delivery time: delivery period is 4 ~ 8 weeks.
4. Storage Environment
● Temperature：15℃~25℃
● Humidity：≤50%