Selective CUT-OFF laser filters using brilliant green-doped PMMA polymeric composite films: sensing approach

Brilliant green doped poly(methyl methacrylate) (BG/PMMA) films were prepared by using a simple casting method. XRD patterns support the amorphous structure of both pure PMMA and its BG-doped PMMA polymeric composite films. The transmittance T() and absorbance (abs) were directly measured and investigated. From the analysis of transmittance curves of BG/PMMA, we can notice that the addition of BG to the PMMA matrix creates multi-bands of the absorption measurements in the wavelength range 215-610nm. The absorption valley of BG/PMMA can be summarized as follows: 740-489nm, 489-362nm, and 362-261nm. The BG/PMMA have a CUT-OFF of transmittance in the wavelength region 585-645nm suitable for He-Ne laser of wavelength=632nm as an example. Optical parameters were calculated for the BG/PMMA polymeric composite films. AC electrical conductivity, dielectric constant, and dielectric loss were measured and analyzed according to the applied models in the field of polymeric materials. The studied samples are suitable to be applicable in selective laser CUT-OFF filters and solar cell applications as identified using optical limiting effect.