English
Infrared anti-reflection coatings are widely used in near-infrared and mid-infrared bands. On one hand, the rise of near-infrared spectroscopy and its advantages in non-destructive in vivo testing have drawn significant attention to near-infrared applications. On the other hand, mid-infrared research holds great importance with the development of infrared imaging, infrared detection, infrared remote sensing, and aerospace applications.
Infrared technology was initially applied in military fields, later expanding to atmospheric detection, aerospace, and civilian applications. In infrared optical systems, transmittance determines performance. Reducing surface reflection to enhance working-band transmittance is crucial for practical applications. Depositing anti-reflection coatings on infrared optical components has become a key research focus to minimize reflection loss and improve system capabilities. With advancing optics, increasing demand for infrared-band devices drives the development of high-performance infrared anti-reflection coatings as a vital research area.
| Category | Key Research Findings | Materials Used | Performance Metrics | Applications |
| NIR (0.78-2.5μm) AR Coatings | Tavg >91% (400-1000nm) using ZnS/YbF₃ on ZnS substrate | ZnS (substrate), ZnS/YbF₃ | 91% avg. transmittance (400-1000nm) | Spectral analysis |
| Tavg>97% (620-1550nm) using TiO₂/M1/SiO₂ | TiO₂/M1(Pr:Al₂O₃)/SiO₂ | 97% avg. transmittance (620-1550nm) | Broadband optics | |
| Tavg>97.04% (550-780nm & 1.0-1.3μm) on K9 glass | TiO₂/SiO₂ on K9 glass | 97.04% avg. transmittance | Dual-band systems | |
| Tavg>99.42% (0.9-1.7μm) on CaF₂ | TiO₂/SiO₂ on CaF₂ | 99.42% avg., 99.98% peak-performance NIR systems | ||
| IR (2.5-25μm) AR Coatings | BaF₂/ZnSe bilayer on Ge for 14-16μm | Ge substrate, BaF₂/ZnSe | Effective AR in 14-16μm | Satellite IR horizon sensors |
| Comparative studies of ZnS/CdTe/ZnSe monolayers on Ge (10.4-12.5μm) | Ge substrate, ZnS/CdTe/ZnSe | Various performance | IR window applications | |
| Broadband IR AR | 8-14μm & 2-14μm broadband AR | Various substrates | Broadband coverage | Early broadband applications |
| Ion-assisted deposition on lead molybdate | Lead molybdate crystal | Improved performance | Fiber optic communications | |
| ZnSe/BaF₂ on Ge (8-12μm, 97% avg.) | Ge substrate, ZnSe/BaF₂ | 97% avgmittance | Mid-IR applications | |
| Extended to 6.4-15μm bandwidth | Various materials | Broadband coverage | Aerospace remote sensing | |
| Ge/ZnS/YbF₃ on Ge (7.5-11.5μm, 98% avg., 99.2% peak) | Ge substrate, Ge/ZnS/YbF₃ | 98% avg., 99.2% peak | High-performance IR | |
| ZnSe substrate with ZnSeS/YbF₃ (7-14μm, 97% avg.) | ZnSe substrate, ZnSe/ZnS/YbF₃ | 97% avg. transmittance | Broadband IR | |
| ZnSe/YF₃ on ZnSe (2-16μm, 93% avg.) | ZnSe substrate, ZnSe/YF₃ | 93% avg. transmittance | Ultra-broadband IR | |
| Dual-band IR AR | Ge substrate for 3-5μm & 8-12μm (94% avg.) | Ge substrate | 94% avg. transmittance | Dual-band IR systems |
| ZnS radome coating (>90% avg. on curved surfaces) | ZnS radome | >90% avg. transmittance | Aerospace applications | |
| IR fiber end-face coatings | Fiber optics | Reduced reflection | Fiber optic protection | |
| ZnS window for 0.8-1.7μm & 3.7-4.8μm | ZnS window | Dual-band performance | High-speed aircraft | |
| Extended Research | Conductive grid + AR coating for anti-fog/EM attenuation | Composite materials | Multifunctional | IR imaging systems |
| Graded-index AR on ZnSe (3-12μm, 95% avg.) | ZnSe substrate | 95% avg. transmittance | Gradient optics | |
| Angle-insensitive AR on Al₂O₃ (3-5μm, 0°-60°) | Al₂O₃ substrate | Wide-angle performance | Polarization-sensitive systems | |
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