Abstract: The invention is directed to a hermetically sealed device and a method for making such device. The device includes optical, micro-electromechanical, electronic and opto-electronic devices, having a substrate with one or a plurality of optical, opto-electronic, electronic or micro-electromechanical (“MEMS”) elements either singly or in combination that are located on a substrate; a covering having a top part and an extension extending a distance from the top part from the top part, an adhesive that is used to bond the extension portion of the covering to the substrate; and a sealing agent for hermetically sealing the area where the covering extension is bonded to the substrate. In the method of the invention the sealing agent is applied using atomic layer deposition techniques.

Abstract: Generally, the invention is for a neutral color, anti-reflective coating for optical elements transmitting light in the visible range, said coating having a 3-layer or 4-layer structure comprising at least two coating materials selected from the group consisting of: (a) a coating material A having an index of refraction in the range of 1.35-1.5; (b) a coating material B having an index of refraction in the range of 1.9-2.4; and (c) a coating material C having an index of refraction in the range of 1.6-1.8. wherein said coating is placed on the first face or the second face, or both, of a substrate transmissive to light in the visible range. The invention is further directed to optical elements having the foregoing coatings.