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We report on a frequency-tunable plasmonic structure for multi-frequency terahertz (THz) analysis on a sub-wavelength scale. In spite of much interest in plasmon-based THz technologies, a main shortcoming of conventional devices is that they exhibit poor frequency-tunability in fixed structures. We here demonstrated that the frequency of THz plasmonic resonance is continuously tunable according to the angle of polarization of the incident THz wave, which enhanced the flexibility in near-field THz applications. Biological and medical applications with this method are presented.
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