多铁性材料BiFeO3的大弹光效应和可逆电致变色
Large elasto-optic effect and reversible electrochromism in multiferroic BiFeO3
摘要：
光场的控制通常通过单晶铁电或极性化合物如LiNbO 3或石英中的电光或声光效应来实现。近年来，铁电氧化物薄膜技术取得了巨大的进展，该领域现在是电子学、自旋电子学和光电子学等领域的强大驱动力。在这里，我们应用外延应变工程调整BiFeO 3薄膜的光学响应，并发现一个非常大的变化的光学指数与应变，对应于一个有效的弹光系数大于石英。我们观察到一个伴随的应变驱动的光吸收的变化-让人想起压致变色-我们可以通过电场操纵。这构成了可逆的、可恢复的且不受缺陷驱动的电致变色效应。这些发现拓宽了多铁性材料在光子学和薄膜声光器件方面的应用前景，并提出了铁性、压电和光学响应耦合所带来的令人兴奋的器件机会。
英文摘要：
The control of optical fields is usually achieved through the electro-optic or acousto-optic effect in single-crystal ferroelectric or polar compounds such as LiNbO3 or quartz. In recent years, tremendous progress has been made in ferroelectric oxide thin film technology - a field which is now a strong driving force in areas such as electronics, spintronics and photovoltaics. Here, we apply epitaxial strain engineering to tune the optical response of BiFeO3 thin films, and find a very large variation of the optical index with strain, corresponding to an effective elasto-optic coefficient larger than that of quartz. We observe a concomitant strain-driven variation in light absorption - reminiscent of piezochromism - which we show can be manipulated by an electric field. This constitutes an electrochromic effect that is reversible, remanent and not driven by defects. These findings broaden the potential of multiferroics towards photonics and thin film acousto-optic devices, and suggest exciting device opportunities arising from the coupling of ferroic, piezoelectric and optical responses.
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