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Negative refraction and plano-concave lens focusing in one-dimensional photonic crystals
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) Schematic diagram of the microwave experimental setup and negative refraction of plane waves by the 1D PC1 prism. Angle of incidence is 45° and angle of refraction is resulting in negative refraction with refractive index at . The real part of scale: on the left side varies from to 0.015, on the right side from to 0.006.

Image of FIG. 2.
FIG. 2.

(Color online) (a) Equifrequency (in GHz) surface (EFS) of the first band and (b) EFS of the second band for the TM modes of the 1D PC with , , and . (c) Band structure for normal incidence . (d) Frequency vs average outgoing power, calculated as the average of in the scanned area. From all energy is internally reflected. Note the leaking of energy from around the edges of the band gap. Measurement was performed between 3 and .

Image of FIG. 3.
FIG. 3.

(Color online) Focusing by a 1D plano-concave PC lens having , , and radius of curvature . The focus point observed at is from the concave lens surface. A photograph of the PC is superimposed to obtain the final figure. On the left side, field map of the incoming plane wave is shown (real part of transmission coefficient) and on the right side, intensity of the focus point. Scale: on the left, from to 0.03, on the right side from 0 to . Dimensions of the lens are .

Image of FIG. 4.
FIG. 4.

(Color online) Field maps of the incident source and the emerging plane wave. Scale: on the left side intensity varies from 0 to 0.14, on the right side the real part of from to 0.02. The source is placed at the focal length and plane wave is observed at .

Image of FIG. 5.
FIG. 5.

(Color online) Refractive indices determined from the focusing and refraction experiments for the TM modes of the 1D dielectric PCs with . The solid line is for PC1 and the dashed line for PC2 .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Negative refraction and plano-concave lens focusing in one-dimensional photonic crystals