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Opt Express. 2009 Aug 17;17(17):15072-86.

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

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Delft University of Technology, Faculty of Applied Sciences, Department of Imaging Science and Technology, Optics Research Group, Lorentzweg 1, 2628 CJ Delft, The Netherlands.


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.

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