Terahertz near-field vectorial imaging of subwavelength apertures and aperture arrays

Opt Express. 2009 Aug 17;17(17):15072-86. doi: 10.1364/oe.17.015072.


We present measurements of the complete terahertz (THz) electric near-field distribution, E(x), E(y) and E(z), in both the time- and frequency-domains, for subwavelength apertures and subsections of subwavelength aperture arrays. Measuring the individual components of the THz near-field with subwavelength spatial resolution, as they emerge from these structures, illustrates how the field interacts with the apertures. We observe the small but measurable y- and z-components of the electric field for both single apertures and arrays. Resonant contributions, attributed to Bloch modes, are detected and we observe the presence of a longitudinal field component, E(z), within the different array apertures, which can be attributed to a diffractive effect. These measurements illustrate in detail the individual THz field components emerging from subwavelength apertures and provide a direct measure of two important mechanisms that contribute to the net transmission of light through arrays.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Computer Simulation
  • Equipment Design / methods
  • Materials Testing
  • Optics and Photonics*
  • Refractometry / instrumentation*
  • Refractometry / methods
  • Silicon / chemistry
  • Surface Plasmon Resonance / methods
  • Terahertz Spectroscopy / methods*


  • Silicon