An anti-reflective, anti-glare or anti-reflection coating is a type of optical coating applied to the surface of lenses, other optical elements, and photovoltaic cells to reduce reflection. In typical
Uncoated glasses lens (top) versus lens with anti-reflective coating. The reflection from the coated lens is tinted because the coating works better at some wavelengths than others.
Anti-reflective coatings are often used in camera lenses, giving lens elements distinctive colors. Such colors indicate the wavelength of visible light least affected by the antireflective properties of the coating. A variety of colors can be produced whose precise hue depends entirely on the thickness of the coating. Color or cast can change radically when the coating is increased or decreased in thickness by tens of nanometers.
An unmetallised heterojunction solar cell precursor. The blue colour arises from the dual-purpose indium tin oxide anti-reflective coating, which also enhances emitter conduction.
An anti-reflection coated window, shown at a 45° and a 0° angle of incidence
A lens flare is a visual artifact caused by light scattering, or flaring, in a lens system. This can happen through light scattered by the imaging mechanism itself, for example through internal reflec
Anti-reflective coating
…this effect; this is a form of biomimicry. Canon uses the moth-eye technique in their SWC subwavelength structure coating, which significantly reduces lens flare. Such structures are also used in photonic devices, for example, moth-eye structures grown from tungsten oxide and iron oxide can be used as photoelectrodes…
Lens flare against a blue sky, in the centre of the image
Light coming from a narrow angle may be "trapped" and reflected between the surfaces of the lens elements.
Severe flare in a CCTV camera lens
Deliberate use of lens flare on a photograph of the Borobudur stairs, to enhance the sense of ascending