A Conceptual Study on Photodynamic Control-Mediated Holographic Composites

Abstract

Herein, photodynamic control-mediated holographic composites are proposed, which are composed of photosensitizers, singlet oxygen receptors, and a polymeric matrix. Rose bengal (RB) and methylene blue (MB) are used as photosensitizers, and 1,3-diphenylisobenzofuran (DPBF) as a singlet oxygen receptor. First, the photodynamic effects of the photosensitizers in DPBF-dissolved solutions are evaluated by analyzing the optical properties of DPBF under laser irradiation. The results confirm that RB and MB are selectively photoexcited by a green and red laser, respectively, and DPBF only reacts to the photosensitized singlet oxygen. Similarly, an outstanding photodynamic effect is observed in the DPBF-coated photodynamic films upon 660 nm laser irradiation. To evaluate the holographic performances of the films, the diffraction efficiency of the films is measured under the beams. The diffraction efficiency of the films is 2.03%. The results suggest that the conformational changes of the receptor are accompanied with absorptive gradients on the films. Therefore, it is strongly believed that the new strategy with photodynamic control can provide appealing solutions in the near future for holographic applications.