Conformal thin films for curved and freeform optics

Emerging optics, such as those in mobile phone cameras, AR/VR goggles and LiDAR devices, reach the limits of traditional PVD technologies and demand optical coatings with conformality only achievable by ALD.

Coating complex optics made easy. Current optical coating methods are well-established for low cost, tolerable process temperature and high throughput. However, traditional PVD coating technologies lack high conformality, making emerging microstructured, curved and freeform optics difficult to coat. For coating complex optics, ALD provides advantages over PVD, like precise thickness control and uniformity, without sacrificing film performance.

Optical Coating Solutions with ALD

Process Options
Thermal ALD
Plasma-Enhanced ALD

SiO2, TiO2, Al2O3,
Ta2O5, Nb2O5

Lenses, fibers, domes, waveguides, freeform

At Beneq, we have optimized conformal optical coating deposition at the intersection of uniformity, batch size and deposition rate. ALD is suitable for all types of optical coatings including:

  • Antireflective, highly reflective and highly absorbing coatings
  • Bandpass, bandstop and edge-pass filters
  • Waveguide cladding, core or strain layers
  • Transparent conductive oxides

Uniformity for your strictest design requirements. The conformality of our films makes ALD the ideal process for curved lens and complex optical components. Even large diameter optical domes coated in our batch processes have film non-uniformity across all locations of only 1.2%. ALD makes coating substrates possible across 9 orders of magnitude.

Silicon test structure

Perfectly conformal ALD film stack on silicon test structure. ALD is also commonly used for coating waveguides and custom laser optics.

Curved lenses

With ALD, it is simple and easy to coat highly curved, aspheric lenses with the same reflection or transmission values across the entire surface.


Designed for the perfect balance between uniformity and throughput. Despite a lower deposition rate than PVD, ALD enables you to coat your optics in much larger batches. ALD processes coat entire components conformally, giving you unparalleled uniformity and throughput compared to PVD. The Beneq P400A is optimized at the intersection of uniformity, batch size, and deposition rate to deliver you the highest quality thick films. We provide you with expertise and software to design every individual ALD layer for the best performance in the context of your design constraints.

Learn more about ALD coatings for spherical domes. 

Learn more about Beneq P400A.

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