论文标题
镜面表面纳米结构通过激光直接写作 - 表征和物理起源
Mirror Surface Nanostructuring via Laser Direct Writing -- Characterization and Physical Origins
论文作者
论文摘要
添加光学吸收层以其他方式标准的介电镜可以实现一组激光直接编写纳米结构方法，这些方法可以在保留高反射率的同时为此类镜子添加功能。这些镜子特别适合在光学微腔中使用，其中可以构建光子的任意潜在景观。使用高腔体精细的光子玻色菌凝结物进行的实验是从这种方法中受益匪浅的一个领域。本文给出了我们对该方法的实施的彻底表征，并研究了其物理起源。特别是，我们的测量结果表明，这种镜子的激光直接编写具有可逆的和永久的成分，可逆过程源自表面的热膨胀，并允许一种简单而精确的方法暂时修改镜子的形状。扫描电子显微镜横截面图像表明，纳米结构过程的永久部分是由于使用的介电镜的诱使孔形成和阳性氧化物层中的增大。
The addition of an optically absorptive layer to otherwise standard dielectric mirrors enables a set of laser direct writing nanostructuring methods that can add functionality to such mirrors while retaining their high reflectivity. These mirrors are particularly suited for use in optical microcavities, where arbitrary potential landscapes for photons may be constructed. Experiments with photon Bose-Einstein condensates, where high cavity finesse is essential, is one area that has greatly benefited from this approach. A thorough characterization of our implementation of this method is given in this paper, and its physical origins are investigated. In particular, our measurements show that laser direct writing of such mirrors has a reversible and a permanent component, where the reversible process originates from the thermal expansion of the surface and allows a simple yet precise way to temporarily modify the shape of the mirror. Scanning electron microscope cross-sectional images suggest that the permanent part of the nanostructuring process is due to thermally induced pore formation and enlargement in the tantalum oxide layers of the used dielectric mirror.
