Plasmonic terahertz (THz) resonators provide a promising route for exploring strong light-matter coupling phenomena. Double-metal resonator designs in particular enable strong enhancement of the THz field and provide well-defined field orientation and confinement within a sub-wavelength size volume. The strong field confinement however limits access to the internal fields essential for investigations of light-matter coupling. We propose and investigate a method for mapping and spectroscopic analysis of the internal fields in double-metal plasmonic THz resonators. We use aperture-type scanning near-field THz microscopy to access strongly confined fields with sub-wavelength spatial resolution of ~5 μm (~λ/100). Combined with the THz time-domain spectroscopy technique, the near-field method allows us to perform spectroscopic studies and investigate the field evolution inside the resonator. This experimental method opens doors to studies of strong light-matter coupling at THz frequencies in individual plasmonic resonators.
Oleg Mitrofanov, Zhanghua Han, Fei Ding, Sergey I. Bozhevolnyi, Igal Brener, and John L. Reno, "Spectroscopy and mapping of resonant fields in terahertz plasmonic resonators," Proc. SPIE 10111, Quantum Sensing and Nano Electronics and Photonics XIV, 101110R (Presented at SPIE OPTO: January 30, 2017; Published: 27 January 2017); https://doi.org/10.1117/12.2254416.
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