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Leaky and bound modes in terahertz metasurfaces made of transmission-line metamaterials
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10.1063/1.4776761
/content/aip/journal/jap/113/3/10.1063/1.4776761
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/3/10.1063/1.4776761
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(a) A perspective and (b) top view of the metal-metal waveguide operating near with a unit cell size, p, with its x component, E-field profile, and equivalent magnetic current sources M s , given by double-headed arrows for the higher-order lateral TM01 waveguide mode. (c) Circuit model and (d) typical dispersion. (e) Side view of the E-field profile from a full-wave finite element simulation (Ansys's HFSS) of an infinitely long structure operating at the series band edge mode and (f) shunt band edge mode .

Image of FIG. 2.
FIG. 2.

A perspective and top view of the metal-metal waveguide operating near with a unit cell size, p, with its x component, E-field profile, and equivalent magnetic current sources M s , given by double-headed arrows for the fundamental TM00 waveguide mode with its equivalent circuit model.

Image of FIG. 3.
FIG. 3.

(a) Transmission line model for a CRLH metasurface with its fundamental TM00 waveguide mode excited by p-polarized incident light. (b) HFSS simulations and surface impedance model predictions for surface reactance for p-polarized incident light at an incident angle relative to the surface normal. The surface impedance model qualitatively captures the reactive transitions in the dispersion. The inset maps the regions of capacitive and inductive reactance.

Image of FIG. 4.
FIG. 4.

(a) Transmission line model for a CRLH metasurface with its higher order lateral TM01 waveguide mode excited by s-polarized incident light. (b) HFSS simulations and surface impedance model predictions for surface reactance for s-polarized incident light at an incident angle relative to the surface normal. The surface impedance model qualitatively captures the reactive transitions in the dispersion, either from capacitive to inductive or inductive to capacitive. The inset maps the regions of capacitive and inductive reactance.

Image of FIG. 5.
FIG. 5.

(a) A perspective and (b) cross section side view of the metal-metal waveguide's unit cell of length p, with its equivalent circuit model. (c) Scanning electron microscope images of the fabricated CRLH waveguide array (perspective view) and a top down view of a unit cell (inset).

Image of FIG. 6.
FIG. 6.

(a)-(c) Measured and (d)-(f) surface impedance model predicted absorption contour plots for samples S1, S2, and S3 respectively, when illuminated with s-polarized incident light.

Image of FIG. 7.
FIG. 7.

Simulated H-field averaged over the unit cell of the CRLH metal-metal waveguide (sample S1). Insets show the magnitude of the E-field for a cross section along the direction of propagation for a unit cell and the placement of the polyethylene prism relative to the sample (Otto-coupling configuration) used to map the waveguides' dispersion outside the light cone.

Image of FIG. 8.
FIG. 8.

Measured spectra for sample S3 for (a) p-incident and (b) s-incident angles with coupling distance between the sample and prism of 10 μm. Measured absorption for (inset of (a)) p-incident light and (inset in (b)) s-incident light at a prism-to-air gap incident angle of for different prism-to-sample coupling distances.

Image of FIG. 9.
FIG. 9.

Measured dispersion and HFSS simulations for all three samples for (a) p-polarized and (b) s-polarized light inside and outside of the light cone. Dispersion captured by the surface impedance model for (inset of (a)) p-polarized incident light with a 40 μm prism-to-sample coupling spacing and (inset of (b))) s-polarized incident light with 10 μm prism-to-sample coupling spacing.

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/content/aip/journal/jap/113/3/10.1063/1.4776761
2013-01-18
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Leaky and bound modes in terahertz metasurfaces made of transmission-line metamaterials
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/3/10.1063/1.4776761
10.1063/1.4776761
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