通过极化子激发实现导电聚合物薄膜中ENZ波长的动态调谐
Dynamic tuning of ENZ wavelength in conductive polymer films via polaron excitation
AI总结：
本文通过光激发极化子形成与解离引起的空穴浓度可逆变化，在p型有机PEDOT:PSS薄膜中实现了高达150 nm的ENZ波长动态调谐，并揭示了亚皮秒级超快切换潜力，为柔性光电子学中的非线性光学应用提供了新平台。
摘要：
传统金属和n型掺杂半导体材料作为新兴的epsilon-near-zero (ENZ)材料，在非线性光子应用中展现出巨大潜力。然而，此类材料的一个显著限制是缺乏通用的ENZ波长调谐手段，因此ENZ波长的动态调谐仍是一项技术挑战，从而限制了其在多频段通信等领域的潜在应用。本文通过光激发后极化子形成/解离引起的空穴浓度可逆变化，实现了p型有机PEDOT:PSS薄膜中ENZ波长的动态调谐，并观察到高达150 nm的可调ENZ波长偏移。对极化子激发超快动力学的实验研究揭示，极化子形成的时间常数约为80 fs，解离的时间常数约为280 fs，表明在亚皮秒时间尺度内实现ENZ波长可逆超快切换的潜力。这些发现表明，p型有机半导体可作为通过极化子激发动态调谐ENZ波长的新平台，为基于ENZ的非线性光学应用在柔性光电子学中开辟了新可能。
英文摘要：
Traditional metal and n-type doped semiconductor materials serve as emerging epsilon-near-zero (ENZ) materials, showcasing great potential for nonlinear photonic applications. However, a significant limitation for such materials is the lack of versatile ENZ wavelength tuning, and thus dynamic tuning of the ENZ wavelength remains a technical challenge, thereby restricting their potential applications, such as multi-band communications. Here, dynamic tuning of the ENZ wavelength in p-type organic PEDOT: PSS films is achieved through a reversible change in hole concentrations originated from the polaron formation/decoupling following optical excitation, and a tunable ENZ wavelength shift up to 150 nm is observed. Experimental investigations about ultrafast dynamics of polaron excitation reveal an approximately 80 fs time constant for polaron buildup and an approximately 280 fs time constant for polaron decoupling, indicating the potential of reversal ultrafast switching for the ENZ wavelength within subpicosecond time scale. These findings suggest that $p$--type organic semiconductors can serve as a novel platform for dynamically tuning the ENZ wavelength through polaron excitation, opening new possibilities for ENZ--based nonlinear optical applications in flexible optoelectronics.
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