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We added a reference to declare the source of the photograph at the lower-right corner of Fig. 1.
©2012 Optical Society of America
In the article [1], the inserted photograph at the lower-right corner of Fig. 1 is reproduced from Fig. 8 by A. C. Bedoya et. al. [2]. We used the photograph as a diagram in order to depict the fabricated structure in Fig. 2.
References and links
1. J. Song, X. Zhou, Y. Z. Li, and X. Li, “On-chip spectrometer with a circular-hole defect for optical sensing applications,” Opt. Express 20(17), 19226–19231 (2012). [CrossRef]
2. A. C. Bedoya, M. Y. Ling, J. Brouckaert, N. A. Yebo, D. V. Thourhout, and R. G. Baets, “Biodiesel sensing using silicon-on-insulator technologies,” Proc. SPIE 7366, 73660D (2009).