Optical waveguide film with mark for positioning and method for producing the same
An optical waveguide film includes: an optical waveguide film main body including an optical waveguide core through which light travels and a cladding portion that encloses the optical waveguide core and has a lower refractive index than that of the optical waveguide core; and a marking member that is disposed at least at a portion of a principal surface of the optical waveguide film main body so as to protrude from the principal surface and that includes, at a surface thereof, a groove-shaped mark for positioning.
1. A method for producing an optical waveguide film, comprising:
preparing a laminated material including at least a first cladding layer, a core layer, and a second cladding layer that are layered in this order;
providing, on at least a portion of a principal surface of the laminated material, a marking member that protrudes from the principal surface;
cutting the second cladding layer and the core layer so as to form groove portions and so as to form an optical waveguide core through which light travels, and then cutting the marking member to form a mark for positioning; and
forming a third cladding layer in the groove portions so as to enclose the optical waveguide core within the first to third cladding layers.
2. The method according to claim 1 , wherein the cutting of the second cladding layer and the core layer is performed using a dicing saw.
3. The method according to claim 1 , wherein the marking member has a colored layer on a surface that is cut.
4. The method according to claim 1 , wherein the marking member is formed of a harder material than the laminated material.
5. The method according to claim 4 , wherein the Young's modulus of the marking member is from about 5 GPa to about 300 GPa.
6. The method according to claim 4 , wherein the Young's modulus of the marking member is from about 10 GPa to about 200 GPa.
7. The method according to claim 1 , wherein the marking member is formed of silicone, glass (SiO 2 ) or a resin.
8. The method according to claim 1 , wherein the Young's modulus of the optical waveguide film main body is about 5 GPa or less.
9. The method according to claim 1 , wherein the marking member is disposed at each of four corners of the principal surface of the optical waveguide film main body.