Keywords: THz Lens, silicon, PCA,terahertz
For THz beam guiding between the emitter and detector we offer hyperhemispherical and elliptic silicon lenses and aspheric TPX lenses with different diameter and focal length. 1. Silicon Lenses 1.1 STB-HSL-12-7.1 Hyperhemispherical Silicon Lens with d
For THz beam guiding between the emitter and detector we offer hyperhemispherical and elliptic silicon lenses and aspheric TPX lenses with different diameter and focal length.
1.1 STB-HSL-12-7.1 Hyperhemispherical Silicon Lens with diameter 12 mm and height 7.1 mm
Hyperhemispherical silicon lens
Terahertz beam
1.2 STB-CL-20 - Collimating elliptic silicon substrate Lens with 20 mm diameter
Elliptic collimating lens
Terahertz beam
1.3 Focusing elliptic Silicon substrate Lens STB-FSL-D20-f50
20 mm diameter, 50 mm focal length
Elliptic focusing silicon lens
Terahertz beam
Airy disc diameter
2.1 STB-CTL-D25mm mounted collimating TPX lens for PCA with diameter 25 mm
STB-CTL-D25mm is an accessory for photoconductive antennas (PCA) that are mounted on a 25.4 mm diameter Al heat sink and are equipped with our hyperhemispherical silicon substrate lenses. The divergent THz beam of such an antenna is in a first step slightly collected by the hyperhemispherical silicon lens. In a second step the THz beam is collimated by a 1” diameter TPX (Polymethylpentene) lens, which is also transparent in the visible spectral region. This collimated terahertz beam exits the STB-CTL-D25mm with a diameter of 22 mm. The same configuration can be used to measure a collimated THz beam. An additional focusing TPX lens can be mounted in front of the first TPX lens to obtain a focused THz beam with a focal length of 30 mm.
Collimating TPX lens
Collimated THz beam
Lens Tube
Compatible PCAs
The STB-CTL-D25mm can be used as housing for a PCA, which is mounted on a 25.4 mm diameter Al heat sink. The electrical cable needs to point towards the front side (laser or chip side) of the PCA. Further the PCA needs to be equipped with one of our hyperhemispherical silicon substrate lenses.
2.2 STB-CTLF-D25mm mounted collimating TPX lens for fiber coupled PCA with diameter 25 mm
STB-CTLF-25mm is an accessory for fiber coupled photoconductive antennas (STB-FC-PCA) that are mounted on a 25.4 mm diameter Al heat sink and are equipped with our hyperhemispherical silicon substrate lenses. The divergent THz beam of such an antenna is in a first step slightly collected by the hyperhemispherical silicon lens. In a second step the THz beam is collimated by a 1” diameter TPX (Polymethylpentene) lens. This collimated terahertz beam exits the CTLF-D25mm. It has a diameter of 22 mm. The same configuration can be used to measure a collimated THz beam. An additional focusing TPX lens can be mounted in front of the first TPX lens to obtain a focused THz beam with a focal length of 30 mm.
Collimating TPX lens
Collimated THz beam
Lens Tube
Compatible PCAs
The STB-CTLF-D25mm can be used as housing for a FC-PCA, which is mounted on a 25.4 mm diameter Al heat sink. The electrical cable needs to point towards the front side (laser or chip side) of the PCA. Further the PCA needs to be equipped with one of our hyperhemispherical silicon substrate lenses.
2.3 STB-FTL-f32.5mm mounted focusing TPX lens with focal length 32.5 mm
STB-FTL-f30mm is a mounted TPX (Polymethylpentene) lens. It is used in combination with STB-CTL-D25mm or STB-CTLF-D25mm to focus the terahertz radiation emitted by a photoconductive antenna (PCA). The collimated THz beam of a photoconductive emitter antenna with a collimating TPX lens (STB-CTL-D25mm or STB-CTLF-D25mm) is focused using the mounted TPX lens STB-FTL-f32.5mm. The focal length is 32.5 mm.
Focusing TPX lens
Focused THz beam
Airy disc diameter
Lens Tube
Compatible PCAs
The STB-FTL-f32.5mm can be used with both STB-CTL-D25mm and STB-CTLFD25mm.
List of available focusing plano-convex TPX lenses from stock. Other TPX lenses on request.
Part number | Lens Dia. mm | Focal length mm | Free aperture dia. mm | Ctr. Lens thk. mm | Edge thk.mm |
STB-TPX-D25.4-f10 | 25.4 | 10 | 20 | 11.2 | 3.3 |
STB-TPX-D25.4-f15 | 25.4 | 15 | 23.4 | 10 | 2.5 |
STB-TPX-D25.4-f25 | 25.4 | 25 | 22.4 | 8 | 3.1 |
STB-TPX-D25.4-f32.5 | 25.4 | 32.5 | 22 | 8 | 4.2 |
STB-TPX-D25.4-f50 | 25.4 | 50 | 22.4 | 7 | 4.4 |
STB-TPX-D25.4-f67 | 25.4 | 67 | 22.4 | 6.94 | 5 |
STB-TPX-D25.4-f100 | 25.4 | 100 | 22.4 | 7 | 5.6 |
STB-TPX-D25.4-f150 | 25.4 | 150 | 22.4 | 6 | 5.1 |
STB-TPX-D50-f35 | 50 | 35 | 47 | 18 | 3 |
STB-TPX-D50.8-f65 | 50.8 | 65 | 47.4 | 13 | 4 |
STB-TPX-D50.8-f100 | 50.8 | 100 | 47.8 | 10 | 4 |
STB-TPX-D50.8-f200 | 50.8 | 200 | 47.8 | 8 | 5 |
STB-TPX-D50.8-f250 | 50.8 | 250 | 47 | 8 | 5.5 |
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