The invention relates to conductive multi-layer materials for leak detection applications. The electrically conductive multi-layer material comprises a woven glass fibre web (2) having a binding agent (4) and a fire retardant compound (5), which is impregnated with electrically conductive carbon particles (6), wherein one side of the glass fibre web (2) is coated with metallic electrically conductive layer (10) by the means of vacuum deposition.

An optical fiber and a method of fabrication thereof. The optical fiber includes a core; a cladding surrounding the core; a primary metal coating surrounding the cladding and including a noble metal having a melting point of at least 500 degrees Celsius; and a secondary metal coating surrounding the primary coating and having a melting point higher than the melting point of the primary metal coating, a thickness of the primary metal coating being greater than a thickness of the secondary metal coating.

An optical fiber and a method of fabrication thereof. The optical fiber includes a core; a cladding surrounding the core; a primary metal coating surrounding the cladding and including a noble metal having a melting point of at least 500 degrees Celsius; and a secondary metal coating surrounding the primary coating and having a melting point higher than the melting point of the primary metal coating, a thickness of the primary metal coating being greater than a thickness of the secondary metal coating.

An optical fiber and a method of fabrication thereof. The optical fiber includes a core; a cladding surrounding the core; a primary metal coating surrounding the cladding and including a noble metal having a melting point of at least 500 degrees Celsius; and a secondary metal coating surrounding the primary coating and having a melting point higher than the melting point of the primary metal coating, a thickness of the primary metal coating being greater than a thickness of the secondary metal coating,

An optical fiber and a method of fabrication thereof. The optical fiber includes a core; a cladding surrounding the core; a primary metal coating surrounding the cladding and including a noble metal having a melting point of at least 500 degrees Celsius; and a secondary metal coating surrounding the primary coating and having a melting point higher than the melting point of the primary metal coating, a thickness of the primary metal coating being greater than a thickness of the secondary metal coating,

Ferrite compositions, particularly ferrite coated substrates and more particularly fibre plys coated with ferrites in fibre reinforced polymer composites (FRPC), and composites with a plurality of functionalised fibre layers, include a magnetic ferrite composition for coating a substrate, said composition comprising a resin, and dispersed therein ferrite particulates, wherein said ferrite particulates have an average longest dimension of less than 500 nm. The composition may be used to provide a ferrite composite structure comprising at least one fibre ply, with at least one layer of a magnetic ferrite composition disposed thereon, wherein said ply is substantially encapsulated in a binder matrix to form a fibre reinforced polymer composite.

Ferrite compositions, particularly ferrite coated substrates and more particularly fibre plys coated with ferrites in fibre reinforced polymer composites (FRPC), and composites with a plurality of functionalised fibre layers, include a magnetic ferrite composition for coating a substrate, said composition comprising a resin, and dispersed therein ferrite particulates, wherein said ferrite particulates have an average longest dimension of less than 500 nm. The composition may be used to provide a ferrite composite structure comprising at least one fibre ply, with at least one layer of a magnetic ferrite composition disposed thereon, wherein said ply is substantially encapsulated in a binder matrix to form a fibre reinforced polymer composite.

A method of forming a metallized minor coating on a light diffusing optical fiber (110) includes contacting an end face (118) of a second end (114) of a light diffusing optical fiber (110) with a metallized mirror precursor. The light diffusing optical fiber (110) includes a first end (112) opposite the second end (114), a core (120), a polymer cladding (122) surrounding the core (120) and coplanar with the core at the end face (118) of the second end (114), an outer surface (128), and a plurality of scattering structures (125) positioned within the core (120), the polymer cladding (122), or both, that are configured to scatter guided light toward the outer surface (128) of the light diffusing optical fiber (110). The method also includes heating the metallized minor precursor such that the metallized mirror precursor bonds to the core (120) and the polymer cladding (122) at the end face (118) of the second end (114) thereby forming a metallized minor coating on the end face (118) of the second end (114).

A method of forming a metallized minor coating on a light diffusing optical fiber (110) includes contacting an end face (118) of a second end (114) of a light diffusing optical fiber (110) with a metallized mirror precursor. The light diffusing optical fiber (110) includes a first end (112) opposite the second end (114), a core (120), a polymer cladding (122) surrounding the core (120) and coplanar with the core at the end face (118) of the second end (114), an outer surface (128), and a plurality of scattering structures (125) positioned within the core (120), the polymer cladding (122), or both, that are configured to scatter guided light toward the outer surface (128) of the light diffusing optical fiber (110). The method also includes heating the metallized minor precursor such that the metallized mirror precursor bonds to the core (120) and the polymer cladding (122) at the end face (118) of the second end (114) thereby forming a metallized minor coating on the end face (118) of the second end (114).

Disclosed is an optical fiber including a plasmonic optical filter with a closed curved shape provided at, at least portion thereof. A method of manufacturing the plasmonic optical filter includes a step of exposing a core, a step of forming a thin metal film on the core through physical vapor deposition while rotating the core in a circumferential direction after changing a rotation axis of the core, and a step of patterning nanopatterns on the cylinder-shaped thin metal film using focused ion beam technique assisted with endpoint detection method. Due to such constitutions, an active area to generate an optical signal for optical sensor can be increased.