High refractive index nanocomposite cover-layer for optical storage media

► A nanocomposite with a high refractive index is prepared. ► The nanocomposite is coated on a near-field optical recording media as a cover-layer. ► A successful cover-layer is achieved with the refractive index of 1.86. ► Abtaining a smooth surface is a critical applicability as a cover-layer.