Solving an old puzzle: fine structure of diffraction spots from an azo-polymer surface relief grating
- We report on the experimental and theoretical interpretation of the diffraction of a probe beam during inscription of a surface relief grating with an interference pattern into a photo-responsive polymer film. For this, we developed a set-up allowing for the simultaneous recording of the diffraction efficiency (DE), the fine structure of the diffraction spot and the topographical changes, in situ and in real time while the film is irradiated. The time dependence of the DE, as the surface relief deepens, follows a Bessel function exhibiting maxima and minima. The size of the probe beam relative to the inscribed grating (i.e., to the size of the writing beams) matters and has to be considered for the interpretation of the DE signal. It is also at the origin of a fine structure within the diffraction spot where ring-shaped features appear once an irradiation time corresponding to the first maximum of the DE has been exceeded.
Author details: | Joachim Jelken, Carsten HenkelORCiDGND, Svetlana SanterORCiDGND |
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DOI: | https://doi.org/10.1007/s00340-019-7331-8 |
ISSN: | 0946-2171 |
ISSN: | 1432-0649 |
Title of parent work (English): | Applied physics : B, Lasers and optics |
Publisher: | Springer |
Place of publishing: | Heidelberg |
Publication type: | Article |
Language: | English |
Date of first publication: | 2019/11/01 |
Publication year: | 2019 |
Release date: | 2020/10/20 |
Volume: | 125 |
Issue: | 11 |
Number of pages: | 11 |
Funding institution: | Helmholtz Graduate School on Macromolecular Bioscience (Teltow, Germany) |
Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
DDC classification: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
Peer review: | Referiert |
Publishing method: | Open Access |
Open Access / Green Open-Access |