Thin-Film Coating

Thin-Film Coating

Thin-Film Coating

Thin-film coating is a key-element in most optical products and devices. A variety of coatings, such as an anti-reflection (AR) coating, a high reflection (HR) coating, a partial reflection (PR) coating, and a band-pass filter (BPF) are needed for many our optical components and tunable lasers.

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Santec has developed advanced coating technology and the capability has been a core technology in santec for more than 20 years. Many types of unique coating processes are available from santec.

  • IAD (Ion-assisted deposition)
  • RAD (RF-assisted deposition)
  • IBS(Ion-beam sputter)

Santec has deployed a total 6 units of these deposition machines. Highly reliable direct coatings on glass substrate and on a GRIN (Gradient-index) lens are available.




Some of applications of coating are shown in right pictures.

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Introduction of Grand-Ex Coating Technology

An advanced coating technology so called “Grand-Ex coating technology” has been developed in santec. The coating technology has three unique features as,


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These three key elements enable industrial advanced coating process.


Introduction of thin-film coatings

  Below are some examples of coatings developed by Grand-Ex technology.


1.  Ultralow reflection coating (Super-AR coating)

  Conventional AR coating can suppress surface reflectance to 0.2%. Super-AR coating can suppress as low as 0.01%.Filter_ARcoat_2
  The figure on the left shows a super-AR coating consisting of 2 layers. A narrow wavelength band has minimum residual reflection. Generally this 2 layers coating is called as “V- Coating”.. The measured curve (blue line) shows a good correlation with the design (green line).







Filter ARcoat 4層

  The figure to the left shows a super-AR coating consisting of 4 layers. A wide band has minimum residual reflection. Generally this type of 4 layers coating is called as “W-Coating”. The measured curve (blue line) shows a good correlation with the design (green line).







Filter ARcoat 8層

  The figure to the left shows a super-AR coating consisting of 8 layers. A super wideband has minimum residual reflection. The measured curve (blue line) shows a good correlation with the design (green line).






2.  Ultimate wavelength selective edge filter (Super-PON filter).

  Next generation WDM-PON systems will deploy multi-colored signals between ONT (optical network terminal) and OLT (optical line terminal). The Super-PON filter achieves sufficient signal isolations with a single unit. Efficient signal isolation of 35dB in reflection and transmission are available.Filter_PON_Reflectance






Filter_PON_Transmittance  The figure to the left shows the transmission optical performance. The filter isolation of 40 dB is the highest ever reported in the world. The measured curve (blue line) shows a good correlation with the design (green line).







  These highest performance is only available from santec. Santec will contribute to our society in optical coating technology.