Laser is one of the greatest inventions of the 20th century and has been widely used in all fields of daily life. With the progress of science and technology, laser technology is also constantly developing, in which the micro-nano laser is the frontier of the research produced by the intersection of laser technology and nano-science. With the strong support from the National Natural Science Foundation of China, Ministry of Science and Technology and the Chinese Academy of Sciences, scientists at CAS Key Laboratory of Photochemistry have devoted themselves to the research of organic micro / nano laser materials and devices for many years. Controlled assembly, the excited state of organic micro-nano laser materials, and the organic flexible micro-nano laser array and so on. Full-color laser applications such as biosensing and imaging and optical information processing require the simultaneous output of lasers of different wavelengths on the micro-nano scale, whereas current micro-nano-polychromatic lasers typically integrate different gain media in the same device . However, due to the lack of a mode selection mechanism that adapts to multiple gain intervals, the resulting multi-mode multi-color laser mostly operates in multi-mode. Multi-mode laser will cause random fluctuation of signal and generation of false signal, which is a key bottleneck problem of multi-color laser applied to various photonic devices, especially photon information processing. Recently, researchers have constructed axial composite structures of organic micro-nano resonators with different wavelengths by controlled nanostructure technology, and realized the first laser mode inter-selection between multiple gain intervals to realize the micro-nano single-mode laser with different wavelengths The controllable output provides a solid step toward controllability of high performance nanophotonics integrated devices. Figure 1 Axial coupling nanowire heterojunction mode modulation effect The researchers selected two kinds of organic laser dyes with high optical gain, and prepared two kinds of organic nanocrystals with regular morphology by controllable molecular assembly. Further utilizing the flexibility of micromanipulation methods in material selection and structure construction, two kinds of organic one-dimensional crystals prepared are built into axially coupled heterojunction as a compound resonant cavity structure. In the constructed composite system, each nanowire can generate laser output corresponding to the gain interval and at the same time, as a mode filter of the other nanowire, the laser mode is realized under the synergetic effect between the two nanowires Of the mutual modulation, resulting in a dual-wavelength single-mode laser (Figure 1). Since gain amplification at different wavelengths is spatially separated from each other, the resulting axially coupled resonator can output separate coherent signals of different wavelengths from different ports (Figure 2), which will greatly enhance the integration of photonic integrated devices Degree and flexibility. Relevant results published in Science Advances2017, 3, e1700225. Figure 2 dual-color single-mode laser controllable output
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