We report an error in our paper [C. Lan, Opt. Express 26, 116332018]. The SEM picture shown in Fig. 1(e) was incorrect. This was due to an error during manuscript preparation: The SEM picture of control group is inadvertently provided in Fig. 1(e), instead of correct SEM picture of sample. Figures 1(a)–1(d) are correct and remain unchanged, and this error does not affect the results or conclusions of the paper. We apologize for any confusion this may have caused.
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