Linear Electro‐Optic Effect in 2D Ferroelectric for Electrically Tunable Metalens

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Linear Electro‐Optic Effect in 2D Ferroelectric for Electrically Tunable Metalens
Title:
Linear Electro‐Optic Effect in 2D Ferroelectric for Electrically Tunable Metalens
Journal Title:
Advanced Materials
Keywords:
Publication Date:
15 May 2024
Citation:
Liu, Y., Wu, Y., Duan, R., Fu, J., Ovesen, M., Lai, S. C. E., Yeo, T., Chee, J. Y., Chen, Y., Teo, S. L., Tan, H. R., Zhang, W., Yang, J. K. W., Thygesen, K. S., Liu, Z., Zhang, Y., & Teng, J. (2024). Linear Electro‐Optic Effect in 2D Ferroelectric for Electrically Tunable Metalens. Advanced Materials. Portico. https://doi.org/10.1002/adma.202401838
Abstract:
AbstractThe advent of 2D ferroelectrics, characterized by their spontaneous polarization states in layer‐by‐layer domains without the limitation of a finite size effect, brings enormous promise for applications in integrated optoelectronic devices. Comparing with semiconductor/insulator devices, ferroelectric devices show natural advantages such as non‐volatility, low energy consumption and high response speed. Several 2D ferroelectric materials have been reported, however, the device implementation particularly for optoelectronic application remains largely hypothetical. Here, the linear electro‐optic effect in 2D ferroelectrics is discovered and electrically tunable 2D ferroelectric metalens is demonstrated. The linear electric‐field modulation of light is verified in 2D ferroelectric CuInP2S6. The in‐plane phase retardation can be continuously tuned by a transverse DC electric field, yielding an effective electro‐optic coefficient rc of 20.28 pm V–1. The CuInP2S6 crystal exhibits birefringence with the fast axis oriented along its (010) plane. The 2D ferroelectric Fresnel metalens shows efficacious focusing ability with an electrical modulation efficiency of the focusing exceeding 34%. The theoretical analysis uncovers the origin of the birefringence and unveil its ultralow light absorption across a wide wavelength range in this non‐excitonic system. The van der Waals ferroelectrics enable room‐temperature electrical modulation of light and offer the freedom of heterogeneous integration with silicon and another material system for highly compact and tunable photonics and metaoptics.
License type:
Publisher Copyright
Funding Info:
This research / project is supported by the Agency for Science, Tech-nology and Research (A*STAR) - Individual Research Grants
Grant Reference no. : A20E5c0084

This research / project is supported by the Agency for Science, Tech-nology and Research (A*STAR) - Individual Research Grants
Grant Reference no. : A2083c0058

This research / project is supported by the Agency for Science, Tech-nology and Research (A*STAR) - Individual Research Grants
Grant Reference no. : M23M6c0100

This research / project is supported by the Agency for Science, Tech-nology and Research (A*STAR) - MTC Programmatic
Grant Reference no. : M22L1b0110

This research / project is supported by the National Research Foundation, Singapore - Competitive Research Programme
Grant Reference no. : NRF-CRP26-2021-0004

This research / project is supported by the National Research Foundation, Singapore - Competitive Research Programme
Grant Reference no. : NRF-CRP24-2020-0002

This research / project is supported by the Agency for Science, Tech-nology and Research (A*STAR) - Career Development Fund - Seed Projects
Grant Reference no. : C222812008
Description:
This is the peer reviewed version of the following article: Liu, Y., Wu, Y., Duan, R., Fu, J., Ovesen, M., Lai, S. C. E., Yeo, T., Chee, J. Y., Chen, Y., Teo, S. L., Tan, H. R., Zhang, W., Yang, J. K. W., Thygesen, K. S., Liu, Z., Zhang, Y., & Teng, J. (2024). Linear Electro‐Optic Effect in 2D Ferroelectric for Electrically Tunable Metalens. Advanced Materials. Portico. https://doi.org/10.1002/adma.202401838, which has been published in final form at doi.org/10.1002/adma.202401838. 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.
ISSN:
1521-4095
0935-9648
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