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Seo, M A,Adam, A J L,Kang, J H,Lee, J W,Jeoung, S C,Park, Q H,Planken, P C M,Kim, D S Optical Society of America 2007 Optics express Vol.15 No.19
<P>We present 2D measurements of the full THz electric field behind a sample consisting of multiple slits in a metal foil. Our measurements, which have a sub-wavelength spatial, and a sub-period temporal resolution, reveal electric field lines, electric field vortices and saddle points. From our measurements we are able to reconstruct the magnetic field and, finally, the position and time-dependent Poynting vector which shows the flow of energy behind the sample. Our results show that it is possible to study the flow of light near sub-wavelength plasmonic structures such as slit-arrays and, by implication, other metamaterial samples.</P>
Terahertz near-field vectorial imaging of subwavelength apertures and aperture arrays.
Knab, J R,Adam, A J L,Nagel, M,Shaner, E,Seo, M A,Kim, D S,Planken, P C M Optical Society of America 2009 Optics express Vol.17 No.17
<P>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.</P>
Terahertz field enhancement by a metallic nano slit operating beyond the skin-depth limit
Seo, M. A.,Park, H. R.,Koo, S. M.,Park, D. J.,Kang, J. H.,Suwal, O. K.,Choi, S. S.,Planken, P. C. M.,Park, G. S.,Park, N. K.,Park, Q. H.,Kim, D. S. Springer Science and Business Media LLC 2009 Nature photonics Vol.3 No.3
Focusing of Terahertz Waves onto Micron-sized Slits Grown on ZnTe and GaP Substrates
서민아,H. R. Park,박두재,A. J. L. Adam,P. C. M. Planken,김대식 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.1
We report on terahertz focusing through rectangular slit apertures on thin metal film by using terahertz time domain spectroscopy both in the far- and in the near-field. Our experiments show that far-field perfect transmission is maintained in the rectangular slit array even as the aperture coverage decreases. Near-field imaging supports the field enhancement in the single rectangular aperture indeed occurring at a frequency equal to the fundamental shape resonance frequency.