Indium tin oxide combined with anti-reflective coatings with high transmittance for wavelengths <400  nm

The transparent and conductive properties of indium tin oxide (ITO) thin films make them an attractive coating for optically integrated ion traps. However, the relatively low transmittance for wavelengths , high scattering, and high production temperature limit the usability in trapped-ion-based quantum technologies. Here we present ITO coatings and a combined ITO <400nm anti-reflective (AR) coating system optimized for an ion trap applied using ion beam sputtering (IBS). The coatings feature a high transmittance for wavelengths and additional wavelengths up to 1000 nm, low scattering, and low production temperature . The transmission, reflection, and absorption spectra are simulated and the resistance, transmittance, and scattering at 370 nm are measured for different ITO coating thicknesses and the ITO + AR coating system. For the ITO <400nm AR coating system a resistance of , transmittance of 80%, and scattering of at 370 nm are achieved.