A microfabrication method is provided with which it is possible to easily form a fine periodic structure on a surface of any substrate. A glass precursor is applied to a substrate, and the glass precursor is irradiated with short-pulse laser light. By the irradiation with short-pulse laser light, the glass precursor is activated to undergo a thermal reaction, and a fine periodic structure can be easily formed on the surface. Furthermore, by oxidizing the substrate on which the fine periodic structure has been formed, the hue of the surface can be improved while maintaining the fine periodic structure.

Provided is a transparent substrate with a coating film having excellent ultraviolet absorbing ability and scratch resistance while maintaining visible light transmittance at high level. The transparent substrate with the coating film includes a transparent substrate, and a coating film formed at least at a part of a surface of the transparent substrate. The coating film contains a silicon oxide matrix and a specific ultraviolet absorbent, and has a thickness of 3 to 10 μm. The transparent substrate with the coating film has a transmittance of light with a wavelength of 400 nm of 10% or less, and a visible light transmittance of 50% or more, no scratch is visually recognized by a specific scratch resistance test for surface of the coating film, and a value where YI of the transparent substrate is subtracted from YI of the transparent substrate with the coating film is 10 or less.

Provided is a transparent substrate with a coating film having excellent ultraviolet absorbing ability and scratch resistance while maintaining visible light transmittance at high level. The transparent substrate with the coating film includes a transparent substrate, and a coating film formed at least at a part of a surface of the transparent substrate. The coating film contains a silicon oxide matrix and a specific ultraviolet absorbent, and has a thickness of 3 to 10 μm. The transparent substrate with the coating film has a transmittance of light with a wavelength of 400 nm of 10% or less, and a visible light transmittance of 50% or more, no scratch is visually recognized by a specific scratch resistance test for surface of the coating film, and a value where YI of the transparent substrate is subtracted from YI of the transparent substrate with the coating film is 10 or less.

An optical member including a porous glass layer on a base member is provided, wherein the reflectance is reduced and a ripple is suppressed. The optical member is provided with a base member and a glass layer holding a transparent material in the inside of a porous structure disposed on the base member, wherein in the thickness direction of the glass layer, the porosity in the base member side with respect to the center line of the glass layer in the thickness direction is smaller than the porosity in the side opposite to the base member with respect to the center line of the glass layer in the thickness direction.

An optical member including a porous glass layer on a base member is provided, wherein the reflectance is reduced and a ripple is suppressed. The optical member is provided with a base member and a glass layer holding a transparent material in the inside of a porous structure disposed on the base member, wherein in the thickness direction of the glass layer, the porosity in the base member side with respect to the center line of the glass layer in the thickness direction is smaller than the porosity in the side opposite to the base member with respect to the center line of the glass layer in the thickness direction.

A composite silica glass made light diffusion member includes a dense silica glass, and a porous silica glass which has been layered on the surface of the dense silica glass. The porous silica glass is a porous body and has a homogeneous pore distribution. The porous body has a framework including a plurality of spherical silica glasses, contains a communicating pore part formed by spaces among them, and has a central pore size of 10 to 20 μm and a porosity of 25 to 40%. The spherical silica glasses have an average diameter of 30 to 100 μm. An average value of a specific arithmetic average roughness Ra in each of the spherical silica glass exposed on an outer surface of the porous silica glass is 0.8 to 4.0 nm.

A composite silica glass made light diffusion member includes a dense silica glass, and a porous silica glass which has been layered on the surface of the dense silica glass. The porous silica glass is a porous body and has a homogeneous pore distribution. The porous body has a framework including a plurality of spherical silica glasses, contains a communicating pore part formed by spaces among them, and has a central pore size of 10 to 20 μm and a porosity of 25 to 40%. The spherical silica glasses have an average diameter of 30 to 100 μm. An average value of a specific arithmetic average roughness Ra in each of the spherical silica glass exposed on an outer surface of the porous silica glass is 0.8 to 4.0 nm.

Various embodiments provide an article including a substrate and a coating thereon including a functionalized fluorine containing compound crosslinked with a multifunctional siloxane resin. A method of forming the article includes applying a multifunctional siloxane resin to a substrate, applying a functionalized fluorine containing compound to the substrate, and annealing the multifunctional siloxane resin and the functionalized fluorine containing compound.

Glass frits and enamel compositions from the glass frits for use in automotive application. The enamel composition includes one or more glass frits with reduced amount of bismuth and/or zinc compared to reference enamel compositions available. The glass frits include one or more transition metal oxides. The glass frits exhibit improved chemical durability, reduced glass density, lower L-value, or optimized optical density for an end user depending on the applications.

Glass frits and enamel compositions from the glass frits for use in automotive application. The enamel composition includes one or more glass frits with reduced amount of bismuth and/or zinc compared to reference enamel compositions available. The glass frits include one or more transition metal oxides. The glass frits exhibit improved chemical durability, reduced glass density, lower L-value, or optimized optical density for an end user depending on the applications.