What Is Single-Sided AR Coating?
Single-sided anti-reflection (AR) coating is an optical thin-film treatment applied to only one surface of a glass substrate. It reduces reflection from the coated surface within a specified wavelength range, while the opposite surface remains uncoated or available for another treatment.
For custom optical components, this configuration is useful when only one surface requires AR coating or when the opposite surface must remain available for bonding, printing, assembly or another functional process.
We provide customized coating solutions for precision glass components based on substrate material, operating wavelength, dimensions and optical requirements.
Single-Sided vs. Double-Sided AR Coating
Choosing the correct coating configuration depends on the optical design and how the glass component will be assembled.
| Feature | Single-Sided AR | Double-Sided AR |
|---|---|---|
| Coating surfaces | One surface | Both surfaces |
| Primary purpose | Reduce reflection on the selected surface | Reduce reflection on both surfaces |
| Opposite surface | Uncoated or reserved for another process | AR-coated |
| Typical selection | Components requiring treatment on one side only | Transmission optics requiring reflection control on both sides |
Important: Single-sided AR coating does not eliminate reflection from the uncoated surface. For a conventional glass window in air, the uncoated surface may still reflect approximately 4% of incident light near normal incidence, depending on the glass material and wavelength.
If maximum transmission through both air-glass interfaces is required, consider our double-sided AR coating.
Custom Coating Specifications
Single-sided AR coatings are designed according to the optical and mechanical requirements of each project.
| Parameter | Customization Options |
|---|---|
| Substrate material | Fused silica, borosilicate glass and optical glass |
| Coating configuration | One designated surface |
| Wavelength range | UV, visible or near-infrared, subject to design evaluation |
| Reflectance target | Specified according to wavelength and angle of incidence |
| Dimensions | Custom size and thickness based on drawings |
| Coating area | Full surface or defined clear aperture, subject to feasibility |
| Inspection | Optical performance and applicable dimensional requirements |
Final coating specifications, tolerances and test requirements should be confirmed during technical review before production.
Typical Applications
Optical Windows and Sensor Covers
Reduce reflection at a selected optical interface while retaining an untreated opposite surface where required by the assembly design.
Display Cover Glass
Improve reflection control on the viewing surface while allowing printing, bonding or other processing on the opposite side, subject to process compatibility.
Custom Optical Assemblies
Suitable for components that require different surface treatments on opposite sides or where only one surface needs an AR coating.
Laser and Imaging Components
Single-sided coating may be considered where the optical design requires treatment on only one surface. Laser applications require separate verification of coating performance and damage-threshold requirements.
Coating Design and Quality Verification
Coating performance depends on the substrate, wavelength, angle of incidence and coating design. The following items should be agreed upon before production:
- Identification of the surface to be coated
- Operating wavelength or wavelength range
- Target reflectance at the specified angle of incidence
- Clear aperture and any required uncoated border
- Substrate dimensions and surface quality
- Environmental and durability requirements, where applicable
Reflectance or transmission data should be evaluated under the agreed measurement conditions. Environmental durability or laser damage performance must be verified separately when required by the application.
Frequently Asked Questions
Can single-sided AR coating achieve the same total transmission as double-sided AR coating?
Not necessarily. The untreated surface still contributes reflection when exposed to air. Total transmission depends on the substrate, wavelength, absorption and both optical interfaces.
Can the opposite surface be used for another treatment?
Yes, depending on the substrate and process. Bonding, printing or other surface treatments should be evaluated for compatibility with the AR coating and the intended assembly.
Request a Custom Single-Sided AR Coating Quote
Send us your substrate material, dimensions, target wavelength, coating-side requirements, reflectance target and order quantity. Our team can review your specifications and discuss a suitable coating solution.
Contact Us for a Custom AR Coating Quote →
Two-Surface Transmittance vs Wavelength
