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THz pulsed spectroscopy ex vivo of the gelatin-embedded human brain gliomas. (a) Reflection-mode THz measurement unit based on off-axis gold-coated parabolic mirrors and a reference window, atop of which the tissue specimen is handled. (b), (c) Reference Er and sample Es signals in the frequency and time domains, respectively. Reproduced from Ref. [147] published by SPIE under a Creative Commons Attribution 4.0 Unported License.
