Advanced terahertz electric near-field measurements at sub-wavelength diameter metallic apertures

A. J L Adam, J. M. Brok, M. A. Seo, K. J. Ahn, D. S. Kim, J. H. Kang, Q Han Park, M. Nagel, P. C M Planken

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Abstract

Using terahertz-light excitation, we have measured with sub-wavelength spatial, and sub-cycle temporal resolution the time- and frequency-dependent electric-field and surface-charge density in the vicinity of small metallic holes. In addition to a singularity like concentration of the electric field near the hole edges, we observe, that holes can act as differential operators whose near-field output is the time-derivative of the incident electric field. Our results confirm the well-known predictions made by Bouwkamp, Philips Res. Rep. 5, 321-332 (1950), and reveal, with unprecedented detail, what physically happens when light passes through a small hole.

Original languageEnglish
Pages (from-to)7407-7417
Number of pages11
JournalOptics Express
Volume16
Issue number10
DOIs
Publication statusPublished - 2008 May 12

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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    Adam, A. J. L., Brok, J. M., Seo, M. A., Ahn, K. J., Kim, D. S., Kang, J. H., Park, Q. H., Nagel, M., & Planken, P. C. M. (2008). Advanced terahertz electric near-field measurements at sub-wavelength diameter metallic apertures. Optics Express, 16(10), 7407-7417. https://doi.org/10.1364/OE.16.007407