Open Access Nano Express

Slab thickness tuning approach for solid-state strong coupling between photonic crystal slab nanocavity and a quantum dot

Gengyan Chen, Jing-Feng Liu, Haoxiang Jiang, Xiao-Lu Zhuo, Yi-Cong Yu, Chongjun Jin and Xue-Hua Wang*

Author Affiliations

State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-sen University, Guangzhou 510275, China

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Nanoscale Research Letters 2013, 8:187  doi:10.1186/1556-276X-8-187

Published: 23 April 2013


The quality factor and mode volume of a nanocavity play pivotal roles in realizing the strong coupling interaction between the nanocavity mode and a quantum dot. We present an extremely simple method to obtain the mode volume and investigate the effect of the slab thickness on the quality factor and mode volume of photonic crystal slab nanocavities. We reveal that the mode volume is approximatively proportional to the slab thickness. As compared with the previous structure finely optimized by introducing displacement of the air holes, via tuning the slab thickness, the quality factor can be enhanced by about 22%, and the ratio between the coupling coefficient and the nanocavity decay rate can be enhanced by about 13%. This can remarkably enhance the capability of the photonic crystal slab nanocavity for realizing the strong coupling interaction. The slab thickness tuning approach is feasible and significant for the experimental fabrication of the solid-state nanocavities.

Photonic crystal slab nanocavity; Slab thickness; Quality factor; Mode volume; Strong coupling interaction; Cavity quantum electrodynamics