|Title||Advanced terahertz electric near-field measurements at sub-wavelength diameter metallic apertures|
|Publication Type||Journal Article|
|Year of Publication||2008|
|Authors||A.JL Adam, J.M Brok, M.A Seo, K.J Ahn, D.S Kim, J.H Kang, Q.H Park, M. Nagel, P.CM Planken|
|Type of Article||Article|
|Keywords||DIFFRACTION, ENHANCED RAMAN-SCATTERING, HOLE ARRAYS, LIGHT, METAL, MICROSCOPY, OPTICAL-TRANSMISSION, PROBES, REAL|
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. (C) 2008 Optical Society of America.
|URL||<Go to ISI>://000256469800066|
|Alternate Title||Opt. Express|
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