High Resistivity Float Zone Silicon for Thz Applications

High Resistivity Float Zone Silicon for
Thz Applications
With the exception of synthetic diamond, high resistivity silicon is
practically the single isotropic crystalline material suitable for the
extremely wide range from NIR (1.2 μm) to MM (1000 μm) waves and
more. However in comparison with diamond it is considerably cheaper to
grow and machine. Moreover it may have considerably bigger dimensions
what allows to vary the range of produced parts. Also it is obvious that
silicon is one of most technological materials allowing manufacturing the
elements of fast-developing THz electronics based on that. For THz
applications we offer High Resistivity Float Zone Silicon (HRFZ-Si)
maintaining 50-54% transmission to 1000 μm (and for longer wavelengths
up to 3000 and even to 8000 μm upon custom request).
60
Transmission, %
50
40
30
20
10
0
0 100 200 300 400 500 600 700 800 900 1000 1100
Lenses
Material
Shapes
Thickness tolerance
Wavelength, µm
Available diameters, mm
Diameter tolerance, mm
Surface quality, scr/dig
Surface accuracy, mm
Lenses
Figure 1. HRFZ-Si transmission in FIR-THz range
(Sample thickness - 5 mm).
Measurements were made on Bruker
IFS-120V spectrometer.
Our HRFZ-Si products were approved in tens of
laboratories and many companies over the
world and are successfully used in THz
experiments and devices.
HRFZ-Si
Spherical, Hyper-Hemispherical, Hemispherical,
Hypo-Hemispherical, and Bullet
2–100
+/- 0.1
2% of thickness but not more than 0.1 mm
80/50
0.01 deviation from ideal sphere and plane
Hypo-Hemispherical Hyper-Hemispherical Hemispherical Bullet
r
r
r
r
T < D/2 T > D/2 T = D/2 T = L + A, where A

Tydex always has stock of polished “ball-shaped” blanks of HRFZ-Si with standard diameters (2.0, 4.0,
6.0, 8.0, 10.0, 12.7 mm). Upon your request we can polish flat surface to make lens with specified
thickness and supply required hyper-/hypo-/hemi-spheres within two weeks. Besides this Tydex has
finished parts of different dimensions and shapes in stock which we can offer upon your request and
supply within a week. Please ask us for the current stock.
Also for focusing THz radiation we offer HRFZ-Si meniscus lenses with the following parameters:
Material
Effective focal length (EFL) tolerance, %
Available diameters, mm
Diameter tolerance, mm
Thickness tolerance, mm
Edge thickness variation, mm
Clear aperture, % of diameter
Surface quality, scr/dig
Surface figure (power-irregularity) @ 633 nm
HRFZ-Si
+/- 1
to 100
+0.0 / -0.1
+/- 0.1