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J. Jelken, C. Henkel, and S. Santer
Polarization controlled fine structure of diffraction spots from an optically induced grating
Appl. Phys. Lett. 116 (2020) 051601, selected as Editor's Pick.


    We report on the remote control of the fine structure of a diffraction spot from optically induced dual gratings within a photosensitive polymer film. The material contains azobenzene in the polymer side chains and develops a surface relief under two-beam holographic irradiation. The diffraction of a polarized probe beam is sensitive to the orientation of the azobenzenes forming a permanently stored birefringence grating within the film. We demonstrate that the fine structure of the probe diffraction spot switches from Gaussian to hollow or hollow to "Saturn"-like structure by a change in polarization. This makes it potentially useful in photonic devices, because the beam shape can be easily inverted by an external stimulus.

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file generated: 29 Mar 2021

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