Optical Coatings and Gratings

Optical coatings and gratings are engineered layers and periodic surface structures that control how light reflects, transmits, or diffracts at material boundaries, with applications ranging from camera lenses and solar cells to precision spectroscopy instruments. By tuning film thickness, refractive index, and surface geometry down to the nanoscale — using techniques like glancing angle deposition or drawing inspiration from light-trapping nanostructures found in moth eyes and butterfly wings — researchers can suppress unwanted reflections or redirect specific wavelengths with remarkable precision. A central challenge is extending these capabilities across broader spectral ranges and more extreme environments, since most coatings are optimized for narrow conditions and degrade under heat, humidity, or mechanical stress. Active directions include designing photonic crystal architectures that self-assemble at scale and developing biomimetic surfaces that achieve near-zero reflectance without the fragility that limits current nanostructured films.

Works

53,473

Total citations

439,848

Keywords

Antireflective CoatingsNanostructuresThin-Film MaterialsOptical GratingsBiomimetic SurfacesGlancing Angle Deposition