Alumina 1 Aluminum oxide 1 Bandpass filters 1 Edge filters 1 Fabrication 1 Fabrication procedure Fluorescence microscopy 1 Heterolayers 1 Long waves 1 Optical communication 1 Optical communications and sensing 1 Optical filters 1 Performance limits 1 Refractive index 1 Skin therapies 1 Spectra's 1 Spectroscopic ellipsometry 1 Thin-films 1 Titanium dioxide 1 Visible region 1