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Proceedings Paper

Adjoint method and inverse design for diffractive beam splitters
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Paper Abstract

Diffractive optical elements with a large diffraction angle require feature sizes down to sub-wavelength dimensions, which require a rigorous electromagnetic computational model for calculation. However, the computational optimization of these diffractive elements is often limited by the large number of design parameters, making parametric optimization practically impossible due to large computation times. The adjoint method allows calculating the gradient of the target function with respect to all design variables with only two electromagnetic simulations, thus enabling gradient optimization. Here, we present the adjoint method for modeling wide-angle diffractive optical elements like 7×7 beam splitters with a maximum 53° diffraction angle and a non-square 5×7 array generating beam splitter. After optimization we obtained beam splitter designs with a uniformity error of 16:35% (7×7) and 6:98% (5×7), respectively. After reviewing the experimental results obtained from fabricated elements based on our designs, we found that the adjoint optimization method is an excellent and fast method to design wide-angle diffractive fan-out beam-splitters.

Paper Details

Date Published: 21 February 2020
PDF: 7 pages
Proc. SPIE 11261, Components and Packaging for Laser Systems VI, 1126115 (21 February 2020); doi: 10.1117/12.2543367
Show Author Affiliations
Dong Cheon Kim, HOLOEYE Photonics AG (Germany)
Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Andreas Hermerschmidt, HOLOEYE Photonics AG (Germany)
Pavel Dyachenko, HOLOEYE Photonics AG (Germany)
Toralf Scharf, Ecole Polytechnique Fédérale de Lausanne (Switzerland)

Published in SPIE Proceedings Vol. 11261:
Components and Packaging for Laser Systems VI
Alexei L. Glebov; Paul O. Leisher, Editor(s)

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