Research Papers

Slow light in half-periodic photonic crystal coupled-resonator waveguides with tunable central rod

[+] Author Affiliations
Na Zhu

Jiangsu University, School of Computer Science and Communications Engineering, Zhenjiang 212013, China

Jiwen Sun

Jiangsu University, School of Computer Science and Communications Engineering, Zhenjiang 212013, China

Yingfei Lian

Jiangsu University, School of Computer Science and Communications Engineering, Zhenjiang 212013, China

Cheng Chen

Jiangsu University, School of Computer Science and Communications Engineering, Zhenjiang 212013, China

Yuanyuan Li

Jiangsu University, School of Computer Science and Communications Engineering, Zhenjiang 212013, China

J. Nanophoton. 8(1), 083073 (Nov 03, 2014). doi:10.1117/1.JNP.8.083073
History: Received July 25, 2014; Revised September 29, 2014; Accepted October 2, 2014
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Abstract.  In photonic crystals (PCs) waveguides, the speed of light can be significantly reduced due to the weak coupling between adjacent high-quality-factor nanocavity resonators. However, little research focuses on the length between two cavities associated with slow light characteristics. A waveguide based on a PC within a square array with adjustable rods spreading regularly at the edge and center of the cavity is proposed. Slow light properties in this new structure are studied by using the plane wave expansion method. Through a series of experiments, we find the most suitable coupling length to compromise various parameters of slow light, which is just the half-period of that in a conventional structure. Furthermore, the numerical results reveal that the group velocity is below 3.532×103c in the new model. The corresponding normalized delay-bandwidth product can reach as high as 0.3068 since the group velocity dispersion is at the range of (5to5)×106. All of above signify that the very small size and ultraslow light, as well as outstanding dispersion performance, are realized and there are some advanced features, such as low loss and high integration, in this half-periodic structure.

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© 2014 Society of Photo-Optical Instrumentation Engineers

Citation

Na Zhu ; Jiwen Sun ; Yingfei Lian ; Cheng Chen and Yuanyuan Li
"Slow light in half-periodic photonic crystal coupled-resonator waveguides with tunable central rod", J. Nanophoton. 8(1), 083073 (Nov 03, 2014). ; http://dx.doi.org/10.1117/1.JNP.8.083073


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