Fabrication and characterization of functionalized wet-chemical silver coated films on glass for optical systems

A method for fabricating an Ag coated beam splitter is reported. This shows a specific patterned transmittance by immersing glass substrates in a mixture of H₂SO₄ and H₂O₂ to make negatively charged oxygen sites at the silica surface and then in ethanolic solutions of AgNO₃ and butylamine. We controlled the soaking time and molar ratios of the mixture of AgNO₃ and butylamine to a pattern % transmittance of electroless coated glass surface. Finally, we made a functionalized beam splitter showing step function like transmittance and applied this to make multiple laser beams for display and laser machinings.