Chongfan Technology
News
07
2025
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02
Dynamic metasurfaces based on dual-conductive polymers.
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Metasurfaces are one of the fastest-growing frontiers in the field of nanophotonics. With their precise control over properties such as polarization, phase, amplitude, and wavefront of light, they are expected to replace many optical components for large-scale applications and create entirely new functionalities, thereby fundamentally changing the landscape of optics. Traditional optical metasurfaces are limited by the inherent properties of the unit materials and lack dynamic control capabilities after fabrication. Among various optical functional materials, electrochromic conductive polymer materials have advantages such as large changes in refractive index, high modulation amplitude of transmittance/reflectance, and high flexibility in molecular design, and have been widely applied in new dynamic metasurface devices. However, most dynamic metasurfaces based on conductive polymer materials are currently limited to a single polymer material and mainly focus on the near-infrared working band; when constructing multi-channel dynamic metasurface devices, additional addressing design for the electrode substrate is required, introducing complex fabrication processes and making it difficult to achieve dynamic control and optical system applications over a wider range.
Recently, the Second Institute of Physics at the University of Stuttgart and the Max Planck Institute for Solid State ResearchProfessor Liu NaThe team proposed an innovative dynamic organic metasurface design that combines polyaniline (PANI) and poly(3,4-ethylenedioxythiophene) (PEDOT), achieving dual-channel dynamic control in the visible light frequency range.
The related research results were published under the title "Organic Metasurfaces with Contrasting Conducting Polymers" inNano Letters. The University of Stuttgart and the Max Planck Institute for Solid State ResearchDr. Huang Xiangyu,Robin Kaissnerare co-first authors of the paper, and Professor Hu Yueqiang from the School of Mechanical and Transportation Engineering at Hunan Universityis the co-corresponding author.为论文的共同通讯作者。
Co-design of dual electrochromic conductive polymers breaks through single limitations.
This research introduces two conductive polymers into dynamic metasurfaces for the first time. By using electrochemical polymerization deposition technology, PANI and PEDOT were deposited on pre-selected gold nanorods, forming unique electro-controlled plasmonic nanoantennas. This design allows the metasurface to achieve dual-channel optical responses in a single electrolyte, providing more functional freedom for dynamic optical devices.
Figure 1. Design principle and simulation results of electro-controlled plasmonic nanoantennas. (a) Top: Schematic diagram of electro-controlled plasmonic nanoantennas. The conductive polymer material with thickness h coats the gold nanorod (AuNR), which has dimensions of 220 nm × 110 nm × 50 nm. Bottom: A graph showing the relationship between the refractive index (n, k) of the conductive polymer and the transmittance of conjugated polarized light. The refractive index values of PANI and PEDOT in their oxidized state (OS) and reduced state (RS) are marked in the figure. Arrows indicate the switching between the two states. (b) Top: Schematic diagram showing the opposite on-off relationship of PANI and PEDOT modified nanoantennas under different redox states. Bottom: Comparison of optical response performance of PANI and PEDOT modified nanoantennas with varying thickness.
Combination of dynamic holography and optical control functions.
The study used the Gerchberg-Saxton algorithm to design a dynamic metasurface with holographic display capabilities, which was assembled into an optical device. Experimental results show that by adjusting the redox states of the two polymers, successful dynamic switching of the holographic patterns "HNU" and "MPI" was achieved. This multifunctional response demonstrates excellent control capabilities in the visible light band.
Simplified pixel control and industrial potential.
This study eliminates the reliance on independent electrode wiring in traditional dual-channel dynamic metasurfaces, significantly simplifying the design and manufacturing process, paving the way for large-scale integration and industrialization of dynamic optical devices.
Application prospects.
The dynamic metasurface proposed in this study has broad application prospects in fields such as dynamic holographic display, optical sensing and encryption, and augmented reality and wearable devices. Based on further optimization of conductive polymer performance, this method is expected to extend to a wider range of wavelengths and more combinations of metasurface unit materials, providing new ideas for the design of dynamic optical devices. Combined with high aspect ratio structure fabrication and advanced nano-manufacturing technology, dynamic metasurfaces will become one of the key technologies in the future fields of optical display, sensing, and imaging.
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