Terahertz Near-Field Vectorial Imaging of Subwavelength Apertures and Aperture Arrays

Journal article (2009)
Department
Imaging Science and Technology (AS) (TU Delft)
Copyright: © 2009 Optical Society of America
DOI: https://doi.org/doi:10.1364/OE.17.015072
Apertures Subwavelength structures Terahertz imaging
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Published Date

11-08-2009

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Source:

Optics Express, 17 (17), 2009

ISSN:

1094-4087

Source:

http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-17-15072

Faculty

Applied Sciences

Department

Imaging Science and Technology

Abstract

We present measurements of the complete terahertz (THz) electric near-field distribution, Ex, Ey and Ez, 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, Ez, 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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