Patent ID: 7666468

Claim:
A method for manufacturing a visible spectrum light polarizing optical element having a laminated multi-metal wire grid containing a plurality of metal wires on a substrate, the method comprising the steps of: forming a resist on the substrate; forming concave portions in the resist to provide a resist pattern on the substrate; embedding Al and Ag nano-pastes in the concave portions of the resist pattern by: (i) applying the Al nano-paste in the concave portions of the resist pattern by spin coating the Al nano-paste; (ii) after step (i), heating the applied Al nano-paste at a temperature of 200° C. or less to deposit nano-scale Al particles contained in the Al nano-paste in the concave portions of the resist pattern; (iii) after step (ii), applying the Ag nano-paste in the concave portions of the resist pattern by spin coating the Ag nano-paste; (iv) after step (iii), heating the applied Ag nano-paste at a temperature of 200° C. or less to deposit nano-scale Ag particles contained in the Ag nano-paste in the concave portions of the resist pattern; and repeating steps (i) to (iv) until a desired height for the visible spectrum light polarizing optical element is reached; and removing the resist pattern to form the laminated multi-metal wire grid, wherein each of the nano-scale Al and Ag particles has a diameter of 100 nm or less, the spin coating of the AL and AG nano-pastes is performed by initial coating and subsequent coating, and the initial coating is performed at a rotation speed of 2000-5000 rpm.