We propose and demonstrate a scattering-type near-field probe, designed to increase the sensitivity of high-resolution scattering probe microscopy at terahertz (THz) frequencies. For efficient scattering of THz radiation, the probe, fabricated from indium, is designed to resonate like a dipole antenna. Efficient excitation is achieved by integrating the probe with a radially-polarized THz source. Using time-domain spectroscopy (TDS), we observe resonant enhancement of the scattered fields, and using aperture-type near-field microscopy, we see high field confinement at the scattering probe apex.
Tom Siday, Michele Natrella, Jiang Wu, Huiyun Liu, and Oleg Mitrofanov, "Resonant scattering probes for terahertz near-field microscopy," Proc. SPIE 10540, Quantum Sensing and Nano Electronics and Photonics XV, 1054020 (Presented at SPIE OPTO: February 01, 2018; Published: 26 January 2018); https://doi.org/10.1117/12.2290903.
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