Waveguiding Properties of Fiber-Shaped Aggregates Self-Assembled from Thiacyanine Dye Molecules
Waveguiding Properties of Fiber-Shaped Aggregates Self-Assembled from Thiacyanine Dye Molecules
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DOI：
10.1021/jp071455e
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发表时间：
2007-05
影响因子：
3.7
通讯作者：
K. Takazawa
中科院分区：
文献类型：
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作者：
K. Takazawa
利用空间分辨荧光显微镜研究了硫氰酸（TC）染料自组装的纤维状聚集体在溶液中的波导特性。用聚焦激光束激发转移到玻璃基板上的TC光纤。从光纤端发出的耦合光的光谱被记录为激光光斑与光纤端之间距离的函数。由外耦合光谱构建的伪彩色强度尺度光谱图像较好地显示了光纤的波导特性。定量测定了整个发射波段（470 ~ 620 nm）波长范围内的光损耗。研究发现，光纤的截止波长为~ 480 nm，在此波长以下的光不被引导，这些光纤在530 ~ 600 nm的波长范围内充当低损耗波导。光谱图像还揭示了TC光纤作为一个光腔（法布里-珀罗腔）的作用。
The waveguiding properties of the fiber-shaped aggregates self-assembled from the thiacyanine (TC) dye in solution were investigated by spatially resolved fluorescence microscopy. The TC fibers transferred onto a glass substrate were excited by a focused laser beam. The spectra of the outcoupled light from the fiber end were recorded as a function of the distance between the laser spot and the fiber end. The spectral images in a false-color intensity scale constructed from the outcoupled light spectra exhibited the waveguiding properties of the fibers well. The optical losses for the wavelength range over the entire emission band (470−620 nm) were quantitatively determined. It was found that the fibers have a cutoff wavelength at ∼480 nm, below which the light is not guided, and these fibers act as low-loss waveguides for the wavelength range of 530−600 nm. The spectral images also revealed that the TC fiber functions as an optical cavity (Fabry−Perot cavity) by the recurrence of the guided light due to t...