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We demonstrate THz spectroscopy of mM BSA solutions using the long-range guided mode as an alternative approach to traditional transmission and reflection concepts. The cm propagation lengths pave the way for integrating field-enhancing resonating structures.
We demonstrate end-fire excited THz radiation coupled in thin layers of water propagating a distance of 4 cm. As the propagation lengths are critically dependent from the permittivity, we experimentally demonstrate this propagation length dependency by stepwise exchanging the material layer from deionized water to pure ethanol.
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