School of Electrical, Computer and Energy Engineering, Arizona State University , Tempe, Arizona 85287, United States.
Nano Lett. 2013 Oct 9;13(10):4945-50. doi: 10.1021/nl4029686. Epub 2013 Sep 11.
Multicolor lasing and dynamic color-tuning in a wide spectrum range are challenging to realize but critically important in many areas of technology and daily life, such as general lighting, display, multicolor detection, and multiband communication. By exploring nanoscale growth and manipulation, we have demonstrated the first active dynamical color control of multicolor lasing, continuously tunable between red and green colors separated by 107 nm in wavelength. This is achieved in a purposely engineered single CdSSe alloy nanowire with composition varied along the wire axis. By looping the wide-gap end of the alloy nanowire through nanoscale manipulation, two largely independent (only weakly coupled) laser cavities are formed respectively for the green and red color modes. Our approach simultaneously overcomes the two fundamental challenges for multicolor lasing in material growth and cavity design. Such multicolor lasing and continuous color tuning in a wide spectral range represents a new paradigm shift and would eventually enable color-by-design and white-color lasers for lighting, illumination, and many other applications.
多色激光和宽光谱范围内的动态颜色调谐是极具挑战性的，但在许多技术和日常生活领域都至关重要，例如通用照明、显示、多色检测和多波段通信。通过探索纳米级生长和操控，我们展示了首个多色激光的主动动态颜色控制，其波长在红色和绿色之间连续可调，间隔为 107nm。这是在一条经过精心设计的、沿轴线组成变化的单一 CdSSe 合金纳米线中实现的。通过纳米级操控将合金纳米线的宽带隙端环绕，分别为绿色和红色激光模式形成两个基本上独立（仅弱耦合）的激光腔。我们的方法同时克服了材料生长和腔设计中多色激光的两个基本挑战。这种宽光谱范围内的多色激光和连续颜色调谐代表了一种新的范式转变，最终将实现用于照明、照明和许多其他应用的按需设计颜色和白光激光器。
