Dopping effect on optical constants of polymethylmethacrylate (pmma)‎

Abstract EN

The optical constants (refractive index (n), extinction coefficient (k), real and imaginary parts of dielectric constant (ε1& ε2) of polymethyl methacrylate PMMA) doped with methylene blue (mb) and methyl red (mr) with thickness in the range (0.1-0.2) mm were measured in the wavelength range (200-900) nm.

Refractive index (n) and extinction coefficient (k) showed irregular changes with increasing (mb) dopant concentrations, while (n) and (k) of PMMA doped with (mr) declared a systematic increase with increasing dopant concentrations.

The data showed that (n) values of PMMA doped with (mr) are lower than the values of samples doped with (mb) which is attributed to the progressive increase of absorbance in the wavelength range (400-550) n m with increasing (mr) concentration.