Dynamic photoswitching of micropatterned lasing in colloidal crystals by the photochromic reaction
Dynamic photoswitching of micropatterned lasing in colloidal crystals by the photochromic reaction
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DOI：
10.1039/c2jm34747d
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发表时间：
2012-09
影响因子：
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通讯作者：
S. Furumi;H. Fudouzi;T. Sawada
中科院分区：
文献类型：
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作者：
S. Furumi;H. Fudouzi;T. Sawada
在本报告中，我们成功地证明了在胶体晶体（CCs）中通过光致变色反应实现了微图纹激光的可逆光开关。本研究提出的CC激光（CC- l）腔由一对CC薄膜之间的光致变色发光平面缺陷组成，该缺陷含有二乙烯和芘化合物。低阈值功率的CC- l腔光激发产生单峰激光发射，谱线宽度为0.16 nm，通过光子带隙（PBG）局域缺陷模式出现在CC膜的反射波长范围内。从理论角度来看，基于CC薄膜的标量波近似（SWA）结果的数值计算支持这种缺陷模激光。当313 nm和530 nm的光交替照射CC-L腔时，在CC-L腔中，二乙烯化合物的光致变色反应动态地切换了单激光发射峰。我们可以观察到高对比度的微图案激光图像，其高分辨率仅为几微米，是最有趣的性能。通过掩膜，以313 nm和530 nm的光交替照射，对激光发射的各种微图案图像进行可逆擦除和重写。我们可以设想在各种一维、二维和三维光子晶体（PC）系统中结合光致变色发光材料来实现独特的光开关激光器。本研究不仅为在各种pc中使用光致变色化合物实现激光反馈效应的按需光控制提供了新的指导，而且为下一代光电子技术中制造小尺寸、高密度的全光开关器件提供了新的指导。
In this report, we successfully demonstrate the reversible photoswitching of micropatterned lasing in colloidal crystals (CCs) by the photochromic reaction. The CC-laser (CC-L) cavity proposed in this study consists of a photochromic light-emitting planar defect, containing both diarylethene and pyrromethene compounds, between a pair of CC films. Optical excitation of the CC-L cavity with a low threshold power gives rise to a single laser emission peak with a narrow spectral linewidth of 0.16 nm, which appears within the reflection wavelength range of CC films by the defect mode localized in the photonic band-gap (PBG). From a theoretical standpoint, such defect mode lasing is supported by numerical calculation on the basis of the scalar wave approximation (SWA) results of CC films. When the CC-L cavity is alternately irradiated with 313 nm and 530 nm light, the single laser emission peak is dynamically switched by the photochromic reaction of the diarylethene compound in the CC-L cavity. We can observe the high contrast micropatterned lasing images with a high resolution of only a few micrometers as the most interesting performance. Various micropatterned images of laser emission are reversibly erased and rewritten by alternating photoirradiation with 313 nm and 530 nm light through photomasks. We can envisage that unique photoswitchable lasers are realized by combining the photochromic light-emitting materials in various 1D-, 2D- and 3D-photonic crystal (PC) systems. This report provides new guidelines not only to realize the on-demand photocontrol of laser feedback effects by using photochromic compounds in a variety of PCs, but also to fabricate small-sized and high density all-optical photoswitching devices in next generation optoelectronics.