Patent ID: 7853102

Claim:
A method for fabricating the polymer wavelength filter with high-resolution periodical structure comprising following steps: (a) a positive photo-resister film being coated on a substrate; (b) a grating pattern holographically being exposed using a two-beam interference pattern on the positive photo-resister film; (c) the photo-resister film being coated with a negative photo-resister film to be a first sample; (d) the first sample being exposed by UV light; (e) developing the first sample in a developer to obtain a negative waveguide on the photo-resister film, and the negative waveguide having gratings pattern on its bottom to be a waveguide mold; (f) coating a diluted PDMS film on the patterned waveguide mold; (g) baking the PDMS film to be cured, and peeling off the PDMS film from the waveguide mold to be a PDMS mold with waveguide having gratings pattern; (h) placing a spacer between the PDMS mold and a thin glass slide to form a first tunnel; (i) injecting a precure first UV polymer into the first tunnel; (j) curing the first UV polymer under a broadband UV light; (k) separating the first UV polymer when fully cured, a hardened first UV polymer being formed having a groove with gratings pattern at its bottom, and the first UV polymer being to form a cladding layer of the polymer wavelength filter; (l) a thin layer of a polydimethylsiloxane (PDMS) being spun onto a glass slide, and the glass slide being placed over the groove of the first UV polymer; (m) a second UV polymer being injected into the groove of the first UV polymer; and (n) the second UV polymer being cured by exposing the UV light, and to form the core of the waveguide in the groove of the first UV polymer to finally be the polymer wavelength filter.