Saturday, February 11, 2017

Abstract-Detection of internal fields in double-metal terahertz resonators

Oleg Mitrofanov1,2,a)Zhanghua Han3,a)Fei Ding4Sergey I. Bozhevolnyi4Igal Brener2,5, and John L. Reno

Terahertz (THz) double-metal plasmonic resonators enable enhanced light-matter coupling by exploiting strong field confinement. The double-metal design however restricts access to the internal fields. We propose and demonstrate a method for spatial mapping and spectroscopic analysis of the internal electromagnetic fields in double-metal plasmonic resonators. We use the concept of image charges and aperture-type scanning near-field THz time-domain microscopy to probe the fields confined within the closed resonator. The experimental method opens doors to studies of light-matter coupling in deeply sub-wavelength volumes at THz frequencies.

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