Topology-optimized broadband surface relief transmission grating

We propose a design methodology for systematic design of surface relief transmission gratings with optimized diffraction efficiency. The methodology is based on a gradient-based topology optimization formulation along with 2D frequency domain finite element simulations for TE and TM polarized plane waves. The goal of the optimization is to find a grating design that maximizes diffraction efficiency for the -1st transmission order when illuminated by unpolarized plane waves. Results indicate that a surface relief transmission grating can be designed with a diffraction efficiency of more than 40% in a broadband range going from the ultraviolet region, through the visible region and into the near-infrared region.

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Jacob Andkjær

Christian P. Ryder

Kristian Buchwald

Peter C. Nielsen
Ibsen Photonics A/S (Denmark)

Ole Sigmund
Technical Univ. of Denmark (Denmark)

Contact details

Thomas Rasmussen

Ibsen Photonics
Ryttermarken 15-21
DK-3520 Farum, Denmark
Telephone: (+45) 4434 7000

Copyright © 2014 Society of Photo-Optical Instrumentation Engineers. This paper was published in SPIE Proceedings Volume 8980, Physics and Simulation of Optoelectronic Devices XXII, and is made available as an electronic reprint with permission of SPIE. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.

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