Emission based on enhanced evanescent waves in an optical microcavity and the control

我们构建了一个由棱镜/金属/染料层/气隙/金属组成的金属气隙平面微腔，该微腔可以激发增强的倏逝波。通过调制光通过气隙的干涉，可以灵敏地检测到气隙距离的微小机械变化。实验结果表明，气隙距离可以控制在亚微米级。在光激发染料分子的微腔中，不能观察到由气隙距离调制的光谱发射。另一方面，我们发现金属表面有机薄膜的光致发光光谱与发射角有显著的关系。

We constructed a metallic air-gap planar microcavity of a prism/metal/dye layer/air gap/metal, which allowed exciations of enhanced evanescent waves. A small mechanical variation of the air-gap distance was sensitively detected with modulation of the interference of light through the air gap. The demonstration shows that the air-gap distance is controlled in submicron scale. Emission with spectra modulated by the air-gap distance could not be observed from the microcavity with dye molecules excited by light irradiation. On the other hand, we have found that photoluminescence spectra for organic thin films on metal depended remarkably on emission angles.