Li, D., Wang, N., Zhang, T., Wu, G., Xiong, Y., Du, Q., Tian, Y., Zhao, W., Ye, J., Gu, S., Lu, Y., Jiang, D., Xu, F., 2022. Label-free fiber nanograting sensor for real-time in situ early monitoring of cellular apoptosis.. https://doi.org/10.1117/1.ap.4.1.016001