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

Journal article (2008)
Department
Imaging Science and Technology (AS) (TU Delft)
Copyright: © 2008 Optical Society of America
DOI: https://doi.org/doi:10.1364/OE.16.007407
Spectroscopy Near-field microscopy Apertures Teraherz
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Published Date

06-05-2008

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Source:

Optics Express, 16 (10), 2008

ISSN:

1094-4087

Source:

http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-16-10-7407

Faculty

Applied Sciences

Department

Imaging Science and Technology

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.

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