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Example of the THz-wave penetration depth enhancement using the immersion optical clearing, where glycerol is applied, as an immersion OCA, to a 224-µm-thick abdomen skin tissue ex vivo from a mouse. (a) A photo of the tissue specimen. (b),(c) THz pulsed images of the knife below a tissue using peak-to-peak values of the entire THz waveform or of the THz waveform part at the delays >7.5 ps, respectively. Reproduced from [217] with the permission of Optica Publishing.
