Silicon (Si)
Semiconductor material transparent in the near-infrared
Infrared Semiconductor
Silicon is a semiconductor material that is transparent in the near-infrared and opaque in the visible. It is commonly used for NIR optics, laser components, and substrates in sensing and semiconductor applications. Silicon offers good thermal conductivity and mechanical stability, making it suitable for demanding environments.
Is this material right for your application?
Use When:
Avoid When:
Consider Alternatives:
Near-IR transmission is required
High thermal conductivity is beneficial
Laser or semiconductor-related optics are used
Mechanical stability is important
Visible transparency is not required
Visible optical transmission is required
Broad IR transmission beyond near-IR is needed
High refractive index optics are required
Germanium (Ge) – LWIR performance
ZnSe – broader IR transmission
Fused Silica – visible and UV optics
Key Properties
Optical
Transparent in the near-infrared
Opaque in the visible
Mechanical
Good mechanical strength
Thermal / Environmental
High thermal conductivity
Stable under thermal stress
Explore Related Optical Materials
Frequently asked questions about Barium Fluoride specifications and use-cases
FAQ
Q1. What wavelength range is Silicon used for?
Silicon transmits from ~1.2 µm to ~8 µm.
Q2. Is Silicon suitable for infrared optics?
Yes. Widely used for near- and mid-IR optics.
Q3. Does Silicon require anti-reflection coatings?
Yes. AR coatings are important due to high refractive index.
Q4. What are common alternatives to Silicon?
Germanium and ZnSe.
Opaque in the visible spectrum
High thermal conductivity
Common in IR imaging systems