High Efficiency Anti-Reflective (HEAR) Coatings

Combining high transmission, low reflection and moderate environmental resistance, this coating is best suited for internal surfaces applications. Umicore can successfully apply HEAR coatings to Germanium, Silicon, Zinc Selenide, and Gasir® substrates.

Below is a table showing the typical specification of Umicore’s HEAR coatings.  

Contact us to discuss your specific substrate and spectral requirements.

HEAR Product ID UCS_Ge_01 UCS_Ge_05 UCS_Si_01 UCS_ZAR_03 UCS_GASIR1_01 UCS_GASIR5_01
Substrate Germanium Germanium Silicon Zinc Selenide Gasir®1 Gasir®5
Waveband 8-12µm 3-5µm 3-5µm 8-12µm 8-12µm 8-12µm
Transmission Average 
(thru both sides)
≥98% 8µm-12µm
≥95% 8µm-14µm
≥90% 3µm-5µm ≥98% 3µm-5µm ≥98% 8µm-12µm ≥97% 8µm-12µm
≥95% 8µm-14µm
≥97% 8µm-12µm
≥95% 8µm-14µm
Reflection Average 
(per surface)
≤0.5% 8µm-12µm
≤1.0% 8µm-14µm
≤1.0% 3µm-5µm ≤1.0% 3µm-5µm ≤0.5% 8µm-12µm ≤1.0% 8µm-12µm
≤1.5% 8µm-14µm
≤1.0% 8µm-12µm
≤1.5% 8µm-14µm
Angle of Incidence 0°-20° 0°-20° 0°-20° 0°-20° 0°-20° 0°-20°

Example spectral scan of an HEAR 8-12µm Coating on Germanium

HEAR Coating Environmental Durability Testing:

Adhesion: MIL-C-48497A (

Humidity: MIL-C-48497A (

Moderate Abrasion: MIL-C-48497A (

Contact us for information or a quotation


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