Study of sensitometric and holographic properties of photoresist media based on carbazole-containing polymers sensitized with triiodomethane and pyran photochromic materials

Abstract

Sensitometric and holographic properties of photoresist layers made from carbazolylalkyl methacrylate copolymers and polyepoxypropylcarbazole sensitized with triiodomethane and, additionally, spiropyran photochromic compounds were studied. It was found that the introduction of photochromic 6′-bromo-8′-nitro-1,3,3-trimethylindolylspirobenzopyran (8–12%) into photoresist layers increased their photographic sensitivity by a factor of 2.5–3 up to the values of 10−3–10−4 J cm−2 and shifted their spectral sensitivity to the blue-green region. The feasibility of recording quality holograms in the photoresist layers using coherent He-Cd laser light (λ = 420 nm), as well as argon laser light (λ = 490 nm), was shown. Diffraction gratings with an efficiency of 15–20% and a resolution of 2000 mm−1 were obtained.