Miura R, Imamura S, Ohta R, Ishii A, Liu X, Shimada T, Iwamoto S, Arakawa Y, Kato Y K
Institute of Engineering Innovation, The University of Tokyo, Tokyo 113-8656, Japan.
Institute of Industrial Science, The University of Tokyo, Tokyo 153-8505, Japan.
Nat Commun. 2014 Nov 25;5:5580. doi: 10.1038/ncomms6580.
The unique emission properties of single-walled carbon nanotubes are attractive for achieving increased functionality in integrated photonics. In addition to being room-temperature telecom-band emitters that can be directly grown on silicon, they are ideal for coupling to nanoscale photonic structures. Here we report on high-efficiency coupling of individual air-suspended carbon nanotubes to silicon photonic crystal nanobeam cavities. Photoluminescence images of dielectric- and air-mode cavities reflect their distinctly different mode profiles and show that fields in the air are important for coupling. We find that the air-mode cavities couple more efficiently, and estimated spontaneous emission coupling factors reach a value as high as 0.85. Our results demonstrate advantages of ultralow mode-volumes in air-mode cavities for coupling to low-dimensional nanoscale emitters.
单壁碳纳米管独特的发射特性对于在集成光子学中实现增强功能具有吸引力。除了是可直接生长在硅上的室温电信波段发射器外，它们还非常适合与纳米级光子结构耦合。在此，我们报告了单个空气悬浮碳纳米管与硅光子晶体纳米束腔的高效耦合。介电模式腔和空气模式腔的光致发光图像反映了它们截然不同的模式轮廓，并表明空气中的场对于耦合很重要。我们发现空气模式腔耦合效率更高，估计的自发发射耦合因子高达0.85。我们的结果证明了空气模式腔中超低模式体积在与低维纳米级发射器耦合方面的优势。
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