一种用于生物光子学的介观超材料--金球霰石
Golden Vaterite as a Mesoscopic Metamaterial for Biophotonic Applications
摘要：
具有定制光学响应的介观光子系统在可植入生物医学器件方面具有巨大的潜力。然而，生物相容性通常是一个问题，因为光学特性的工程通常需要使用有毒化合物和化学品，不适合体内应用。在这里，我们展示了一种独特的方法来生物友好地传递光学共振。我们表明，可控的金纳米种子注入到多晶亚微米球文石球晶引起了各种电和磁米氏共振，产生可调介观光学超材料。球晶的三维重建表明，可控的金负载与体积填充因子超过28%的能力。由于组成元素的生物相容性，金色球文石为将设计师制造的Mie共振引入尖端生物光子应用铺平了道路。我们通过在红光和近红外波长下有效地激光加热填充金的球文石球粒来验证这一概念，这在光热治疗和光声层析成像中是非常理想的
英文摘要：
Mesoscopic photonic systems with tailored optical responses have great potential to open new frontiers in implantable biomedical devices. However, biocompatibility is typically a problem, as engineering of optical properties often calls for using toxic compounds and chemicals, unsuitable for in vivo applications. Here, we demonstrate a unique approach to biofriendly delivery of optical resonances. We show that the controllable infusion of gold nanoseeds into polycrystalline submicron vaterite spherulites gives rise to a variety of electric and magnetic Mie resonances, producing a tuneable mesoscopic optical metamaterial. The three-dimensional reconstruction of the spherulites demonstrates the capability of controllable gold loading with volumetric filling factors exceeding 28%. Owing to the biocompatibility of the constitutive elements, golden vaterite paves the way to introduce designer-made Mie resonances to cuttingedge biophotonic applications. We exemplify this concept by showing efficient laser heating of gold-filled vaterite spherulites at red and near-infrared wavelengths, highly desirable in photothermal therapy and photoacoustic tomography
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