[1] A. E. Willner. Lasers: all mirrors are not created equal. Nat. Photonics, 1, 87-88(2007).
[11] R. Magnusson. Wideband reflectors with zero-contrast gratings. Opt. Lett., 39, 4337-4340(2014).
[21] S. Bruynooghe, N. Schmidt, M. Sundermann, H. W. Becker, S. Spinzig. Optical and structural properties of amorphous silicon coatings deposited by magnetron sputtering. Optical Interference Coatings, ThA9(2010).