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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.
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.
(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.
(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.
(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).
Fano fit parameter results.
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