Department of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, People's Republic of China.
Nanoscale Res Lett. 2013 Dec 18;8(1):531. doi: 10.1186/1556-276X-8-531.
Both blue- and redshifts of resonant modes are observed in the rolled-up Y2O3/ZrO2 tubular microcavity during a conformal oxide coating process. Our investigation based on spectral analyses suggests that there are two competitive processes during coating: desorption of both chemically and physically absorbed water molecules and increase of the tube wall thickness. The redshift is due to the increase of the wall thickness and corresponding light confinement enhancement. On the other hand, desorption of water molecules by heating leads to a blueshift. The balance of these two factors produces the observed bi-directional shift of the modes while they both contribute to promoted quality factor after coating.
在共形氧化层涂覆过程中，我们观察到了卷成管状的 Y2O3/ZrO2 微腔中共振模式的蓝移和红移。通过光谱分析，我们发现涂覆过程中有两个竞争过程：化学吸附和物理吸附水分子的解吸以及管壁厚度的增加。红移是由于管壁厚度的增加和相应的光限制增强所致。另一方面，通过加热解吸水分子会导致蓝移。这两个因素的平衡导致了观察到的模式的双向移动，而这两个因素都有助于提高涂覆后的品质因数。
