High transmission silicon for infrared optical applications

Infrared optical systems require materials that have very good transmission characteristics for infrared wavelengths as well as very good mechanical and thermal properties.

In this field of application, silicon material offers a large range of possibilities. Depending the polishing and the resistivity, the transmittance can be either really low or high.

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Transmittance on Double Side Polished (DSP) Si wafer

The maximum transmittance for silicon wafers is 60%. This value allows a large range of possibilities but also limits a wide array of selection. It is really annoying since silicon has unique thermal and mechanical properties.

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Anti-reflective coating on Silicon

Thanks to a valuable coating, Sil’tronix ST achieves new values for transmittances in order to reach 100%.
This layer allows the removal of the Fresnel reflection on both sides.
Furthermore the wavelength can be shifted in order to answer to specific requests.

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This coating is available on any kind of Sil’tronix ST products:

  • Silicon wafers
  • Silicon crystals
  • Silicon prisms
  • Silicon lenses

Define your own transmittance

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