Optical sensing device and method for manufacturing the same

A method for manufacturing an optical sensing device, comprising:

• providing a substrate;
• forming an optical acting area, disposed on the substrate;
• forming a filter layer, covering the optical acting area and selectively allowing only light beams with a specific wavelength to pass therethrough and being received by the optical acting area while blocking light beams with other wavelengths;
• and
• forming a carbonized sidewall, covering a sidewall of the filter layer and a portion of a sidewall of the substrate by irradiating the sidewall of the filter layer and the portion of the sidewall of the substrate with a high-energy laser beam such that the sidewall of the filter layer and the portion of the substrate are melted and carbonized,
• wherein the carbonized sidewall prevents the light beams with the other wavelengths from being received by the optical acting area through the sidewall of the substrate.