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Published September 6, 2016 | Published
Journal Article Open

Multiwavelength metasurfaces through spatial multiplexing


Metasurfaces are two-dimensional arrangements of optical scatterers rationally arranged to control optical wavefronts. Despite the significant advances made in wavefront engineering through metasurfaces, most of these devices are designed for and operate at a single wavelength. Here we show that spatial multiplexing schemes can be applied to increase the number of operation wavelengths. We use a high contrast dielectric transmittarray platform with amorphous silicon nano-posts to demonstrate polarization insensitive metasurface lenses with a numerical aperture of 0.46, that focus light at 915 and 1550 nm to the same focal distance. We investigate two different methods, one based on large scale segmentation and one on meta-atom interleaving, and compare their performances. An important feature of this method is its simple generalization to adding more wavelengths or new functionalities to a device. Therefore, it provides a relatively straightforward method for achieving multi-functional and multiwavelength metasurface devices.

Additional Information

© 2016 The Author(s). This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ Received: 08 July 2016; Accepted: 15 August 2016; Published online: 06 September 2016. This work was supported by Samsung Electronics. A.A. was also supported by National Science Foundation award 1512266. S.M.K. was supported as part of the Department of Energy (DOE) "Light-Material Interactions in Energy Conversion Energy Frontier Research Center" under grant no. DE-SC0001293. The devices were fabricated at the Kavli Nanoscience Institute at Caltech. Author Contributions: E.A., A.A. and A.F. conceived the experiments. E.A., A.A., S.M.K. and Y.H. performed the simulations and fabricated the devices. E.A. performed the measurements, and analyzed the data. E.A., A.A. and A.F. co-wrote the manuscript. All authors discussed the results and commented on the manuscript. The authors declare no competing financial interests.

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August 20, 2023
August 20, 2023