Controllable Polarization‐Insensitive and Large‐Angle Beam Switching with Phase‐Change Metasurfaces

Controllable Polarization‐Insensitive and Large‐Angle Beam Switching with Phase‐Change Metasurfaces

Advanced Optical Materials

10.1002/adom.202101847

http://dx.doi.org/10.1002/adom.202101847

Arash Nemati, Guanghui Yuan, Jie Deng, Aihong Huang, Weide Wang, Yeow Teck Toh, Jinghua Teng, Qian Wang

Electronic, Optical and Magnetic Materials, Atomic and Molecular Physics, and Optics

08 January 2022

Nemati, A., Yuan, G., Deng, J., Huang, A., Wang, W., Toh, Y. T., Teng, J., & Wang, Q. (2022). Controllable Polarization‐Insensitive and Large‐Angle Beam Switching with Phase‐Change Metasurfaces. Advanced Optical Materials, 10(5), 2101847. Portico. https://doi.org/10.1002/adom.202101847

The development of high-efficiency compact non-mechanical beam tuning devices has attracted a lot of attention for light detection and ranging, augmented reality display, and chip-to-chip communication. Owing to the fast wavefront manipulation in an ultra-thin dimension, metasurfaces have been regarded as potential substitutes for traditional tunable optical components toward further miniaturization and low power consumption. However, most beam tuning metasurfaces currently are polarization-sensitive and designed to work in reflection mode, which limit their applications in integrated optical systems for full-range steering. In this paper, a transmission mode polarization-insensitive beam switching metasurface based on nonvolatile phase change material Ge2Sb2Te5 is proposed and experimentally demonstrated at the telecommunication wavelength. The high transmission efficiency with a large switching angle of up to 75° is achievable for potentially full-range beam steering applications. As a proof of concept, the transmitted beam with a switching angle of 15° and directivity of 82.4% is demonstrated. In addition, by controlling the phase transition in the intermediate states, the metasurface can be used as a tunable beam splitter to control the ratio of the beam power between two predesigned transmission angles. The demonstrated phase change metasurfaces pave the way for achieving high-efficiency dynamic beam steering for various important applications.

Publisher Copyright

This research / project is supported by the A*STAR - AME IRG (Individual Research Grant)
Grant Reference no. : A20E5c0095

This research / project is supported by the A*STAR - AME IRG (Individual Research Grant)
Grant Reference no. : A20E5c0084

This research / project is supported by the A*STAR - AME IRG (Individual Research Grant)
Grant Reference no. : A2083c0058

This research / project is supported by the A*STAR - Career Development Fund
Grant Reference no. : C210112044

This research / project is supported by the Ministry of Education - Singapore AcRF Tier 3
Grant Reference no. : MOE2016-T3-1-006 (S)

This is the peer reviewed version of the following article: Nemati, A., Yuan, G., Deng, J., Huang, A., Wang, W., Toh, Y. T., Teng, J., & Wang, Q. (2022). Controllable Polarization‐Insensitive and Large‐Angle Beam Switching with Phase‐Change Metasurfaces. Advanced Optical Materials, 10(5), 2101847. Portico. https://doi.org/10.1002/adom.202101847, which has been published in final form at doi.org/10.1002/adom.202101847. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited

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Institute of Materials Research and Engineering