Abstract
In this paper, lifetime enhancement in a microstrip photonic crystal (PC) cavity by embedding electromagnetic-induced-transparency (EIT)-like meta-atoms is reported. Both microwave experiments and numerical simulations confirm that cavity lifetime can be lengthened about four times, with enhanced Q-factor simultaneously. Further study on electromagnetic field distribution reveals that these enhancements are mainly originated from the confinement along the propagating direction provided by PC cavity and the in-unit localization from the EIT-like meta-atoms. Moreover, study on the group delay shows that by introducing multiple EIT-like meta-atoms, these improvements of cavity lifetime and Q-factor can even be superimposed. As these advantages are not at a cost of extra device volume, the design principle of composite PC–EIT structure is promising to be applied in nonlinear optical devices, optical storage, lasing optics, and so on.
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Acknowledgments
Support from the National Basic Research Program of China (Grant 2011CB922001), from the National Natural Science Foundation of China (NSFC) (Grants 51377003, 51007064, 11234010, 61137003), is gratefully acknowledged.
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Chen, Y.Q., Li, Y.H., Hu, Y.Y. et al. Improving cavity lifetime by electromagnetic-induced-transparency-like meta-atoms. Appl. Phys. A 118, 793–797 (2015). https://doi.org/10.1007/s00339-015-8994-6
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DOI: https://doi.org/10.1007/s00339-015-8994-6