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Plasmon-like surface states in negative refractive index photonic crystals
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Image of FIG. 1.
FIG. 1.

Typical real and imaginary part of dielectric function, , according to Eq. (2) . The red rectangle underlines the negative region in the real part of permittivity.

Image of FIG. 2.
FIG. 2.

Two elementary cell of the 2D PhC slab with the calculated field distribution in correspondence of a wavevector in M point of the Brillouin zone. This field is localized in proximity of the PhC-air interfaces with an enhancement factor of about 80.

Image of FIG. 3.
FIG. 3.

(a) Schematic view of the experimental set-up used to couple laser light (Tuneable diode laser 1520–1620 nm) into the photonic crystal. Abbreviations: M: mirror, PD: photodiode. (b) Scanning electron microscope image of the photonic crystal and first Brillouin zone.

Image of FIG. 4.
FIG. 4.

(a) Experimental reflectance spectrum at (blue line) and best-fit by Fano line-shape (red line). (b) Fits relative to two different angles of incidence.

Image of FIG. 5.
FIG. 5.

(a) Simulated dispersion of odd modes in PhC slab. The red rectangle highlights the experimentally analysed region. (b) Measured (blue dots) and simulated (red line) dispersion characteristic of the 2D PhC slab surface modes. The light line is also shown (dashed line).


Generic image for table
Table I.

Fano fit parameter results.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Plasmon-like surface states in negative refractive index photonic crystals