Analyzing all the optical results, it is clear that the optical spectra are absent in the infrared region (IR) and they only appear around the UV and VR from 1.69 eV to 20 eV. The multiple peaks with greater amplitude show the p-BCN as an exceptional optical material that is operatable both in VR and UV regions. Especially, the high anisotropy and large optical absorption with lowest electron energy loss of monolayer indicate a high polarization sensitivity, and provide a good opportunity to design optical waveguide polarizers as well as energy harvesters.