Multistate Tuning of Third Harmonic Generation in Fano‐Resonant Hybrid Dielectric Metasurfaces

Multistate Tuning of Third Harmonic Generation in Fano‐Resonant Hybrid Dielectric Metasurfaces

Advanced Functional Materials

10.1002/adfm.202104627

http://dx.doi.org/10.1002/adfm.202104627

Omar A. M. Abdelraouf, Aravind P. Anthur, Zhaogang Dong, Hailong Liu, Qian Wang, Leonid Krivitsky, Xiao Renshaw Wang, Qi Jie Wang, Hong Liu

Electrical and Electronic Engineering, General Materials Science

18 September 2021

Abdelraouf, O. A. M., Anthur, A. P., Dong, Z., Liu, H., Wang, Q., Krivitsky, L., Renshaw Wang, X., Wang, Q. J., & Liu, H. (2021). Multistate Tuning of Third Harmonic Generation in Fano‐Resonant Hybrid Dielectric Metasurfaces. Advanced Functional Materials, 31(48). Portico. https://doi.org/10.1002/adfm.202104627

Hybrid dielectric metasurfaces have emerged as a promising approach to enhancing near field confinement and thus high optical nonlinearity by utilizing low loss dielectric rather than relatively high loss metallic resonators. A wider range of applications can be realized if more design dimensions can be provided from material and fabrication perspectives to allow dynamic control of light. Here, tunable third harmonic generation (THG) via hybrid metasurfaces with phase change material Ge2Sb2Te5 (GST) deposited on top of amorphous silicon metasurfaces is demonstrated. Fano resonance is excited to confine the incident light inside the hybrid metasurfaces, and an experimental quality factor (Q‐factor ≈ 125) is achieved at the fundamental pump wavelength around 1210 nm. Not only the switching between a turn‐on state of Fano resonance in the amorphous state of GST and a turn‐off state in its crystalline state are demonstrated, but also gradual multistate tuning of THG emission at its intermediate states. A high THG conversion efficiency of η = 2.9 × 10−6% is achieved, which is 32 times more than that of a GST‐based Fabry–Pèrot cavity under a similar pump laser power. Experimental results show the potential of exploring GST‐based hybrid dielectric metasurfaces for tunable nonlinear optical devices.

Publisher Copyright

This research / project is supported by the A*STAR - A*STAR AME programmatic grant
Grant Reference no. : A18A7b0058

This research / project is supported by the A*STAR - IMRE project
Grant Reference no. : SC25/18-8R1804- PRJ8

This research / project is supported by the A*STAR - IRG grant
Grant Reference no. : A20E5c0094

This research / project is supported by the Ministry of Education, Singapore - Academic Research Fund Tier 2
Grant Reference no. : MOE2018-T2-1-176, MOE-T2EP50120-006

This is the peer reviewed version of the following article: Abdelraouf, O. A. M., Anthur, A. P., Dong, Z., Liu, H., Wang, Q., Krivitsky, L., Renshaw Wang, X., Wang, Q. J., & Liu, H. (2021). Multistate Tuning of Third Harmonic Generation in Fano‐Resonant Hybrid Dielectric Metasurfaces. Advanced Functional Materials, 31(48). Portico. https://doi.org/10.1002/adfm.202104627, which has been published in final form at https://doi.org/10.1002/adfm.202104627. 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.

https://oar.a-star.edu.sg/communities-collections/articles/20562

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