We propose theoretically a tunable circular Bragg microcavity to enhance the intensity of the emission band of interest in rare-earth-doped materials and to suppress the unwanted emission bands which produce noise and diminish the efficiency of the emission of interest. The surrounding of the microcavity comprises of alternating layers of high-index and low-index materials. The luminescent ions such as neodymium Nd³⁺ having different emission bands in different host materials are placed in the microcavity, and single emission band with stronger intensity can be observed, and other emission bands are suppressed. The wavelength of the single emission peak can be changed from one wavelength to other wavelengths by varying the refractive index, radius of the microcavity and thus modifying the local density of states of the microcavity. The fluorescence branching ratio of emission band of interest can be enhanced from 10% to 100% due to suppression of the unwanted emission bands.

我们从理论上提出可调谐的圆形布拉格微腔，以增强掺稀土材料中目标发射带的强度，并抑制产生噪声并降低目标发射效率的有害发射带。微腔的周围包括高折射率和低折射率材料的交替层。钕Nd ³⁺等发光离子在不同的主体材料中具有不同发射带的发射带被放置在微腔中，并且可以观察到强度更高的单个发射带，并且抑制了其他发射带。通过改变微腔的折射率，半径并因此改变微腔状态的局部密度，可以将单个发射峰的波长从一个波长改变为其他波长。由于抑制了不需要的发射带，因此可以将感兴趣的发射带的荧光分支比从10％提高到100％。