Hot mirrors are designed to transmit visible light and simultaneously minimize the infiltration of heat into the system. Standard hot mirrors reflect more poorly the further you go into the infrared wavelength range (see figure): the mirror itself and the system to be protected become heated.
ITO – For Cool Systems
A drastic improvement can be achieved with the ITO material system. With this system, indium oxide (In2O3) and tin oxide (SnO) are sputtered in an alternating mixing ratio. This combination offers threefold:
- Transmission in the Vis
- Reflection in the IR
- Electrical conductivity
With ITO, reflection values of R>80% can be achieved up to the long-wave IR region.
Conductivity of Different ITO Materials
ITO is available in different versions that are more or less conductive. The mixtures alter both the electrical properties and reflection and transmission characteristics.
Application Fields of ITO Coatings
ITO coatings can be used for displays and touchscreens. This coating can also be used for EMC protection in optoelectronic components.
Examples of transmission and reflection curves can be found in the datasheet, which is available for download.
Filters according to Customer Specifications
Do you have special requirements for your filter? We continually develop and manufacture filters according to customer specifications. Simply let us know what you need, and we will present you with solutions for your desired product.
