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. Author manuscript; available in PMC: 2021 Dec 1.
Published in final edited form as: Adv Drug Deliv Rev. 2020 Jun 21;167:121–134. doi: 10.1016/j.addr.2020.06.012

Fig. 1. NIR optical window.

Fig. 1.

The absorption spectrum of human skin showing the first (NIR-I) and second (NIR-II) biological windows. Note that NIR imaging allows low light absorption and scattering into tissue, favoring its application in biological tissues. Modified from Son et al. [5] with permission from Elsevier.