2024-03-28T23:14:04Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/441382020-09-29T09:17:21Zcom_10261_115com_10261_3col_10261_368
Schnell, Martin
García-Etxarri, Aitzol
Borisov, Andrei G.
Aizpurua, Javier
Hillenbrand, Rainer
2012-01-11T11:39:40Z
2012-01-11T11:39:40Z
2010
Journal of Physical Chemistry C 114(16): 7341-7345 (2010)
1932-7447
http://hdl.handle.net/10261/44138
10.1021/jp909252z
1932-7455
We describe transmission-mode scattering-type near-field optical microscopy (s-SNOM) with interferometric detection. Using this technique, we map the near-field modes of infrared antennas in both amplitude and phase. The use of dielectric probing tips, higher-harmonic demodulation, and a complex-valued subtraction of residual background yields accurate near-field images of the antenna modes. We map metallic nanorods, disks, and triangles, designed for antenna resonance at mid-infrared frequencies, in good agreement with numerical calculations of the modal field distribution. Furthermore, we show that transmission-mode s-SNOM can map the z-component of the antenna near fields. Our results establish a basis for future near-field characterization of complex antenna structures for molecular sensing and spectroscopy.
eng
openAccess
Amplitude- and phase-resolved near-field mapping of infrared antenna modes by transmission-mode scattering-type near-field microscopy
artículo