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Photonic crystal composites-based wide-band optical collimator
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10.1063/1.3468242
/content/aip/journal/jap/108/4/10.1063/1.3468242
http://aip.metastore.ingenta.com/content/aip/journal/jap/108/4/10.1063/1.3468242
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Figures

Image of FIG. 1.
FIG. 1.

(a) First three TM polarized bands of (solid) and (dashed), composed of rigid GaN cylinders in air with filling fractions of 0.2513 and 0.1924, respectively. (b) and (c) are the first TM-polarized EFCs of and , respectively. The bold solid curves indicate the EFCs of maximum self-collimation frequency and the dotted curves indicate the corresponding EFCs in air. The dashed and dotted arrows denote the wave vectors in PCs and air, respectively. The solid arrows indicate the boundaries of the flat band and the direction of the group velocity, and the shaded region shows the wave vectors that undergo self-collimation due to flat bands. The propagating waves within the collimation angle were collimated to the orientation.

Image of FIG. 2.
FIG. 2.

The dependence of collimation angles on normalized frequency for , , and .

Image of FIG. 3.
FIG. 3.

(a) Single PC structure ( or ) that had homogenous periodicity and homogenous filling fractions. (b) A PC composite consisting of two PCs of the same periodicity but different filling fractions. A point source was placed on the left side of each PC structure. Arrows indicate the direction of energy transportation.

Image of FIG. 4.
FIG. 4.

Simulated electromagnetic wave propagation of the (31 layer thick in x-coordinate) at a normalized frequency of (a) , (b) , and (c) . (d) Wave intensity along y-coordinate measured by the line receiver.

Image of FIG. 5.
FIG. 5.

Simulated electromagnetic wave propagation of the (31 layers thick in the x-coordinate) at a normalized frequency of (a) , (b) , and (c) . (d) Wave intensity along y-coordinate measured by the line receiver.

Image of FIG. 6.
FIG. 6.

Simulated electromagnetic wave propagation of the PC composite (, has 17 layers in the center and has 7 layers at each side) at a normalized frequency of (a) , (b) , (c) , and (d) . (e) Wave intensity along y-coordinate measured by the line receiver.

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/content/aip/journal/jap/108/4/10.1063/1.3468242
2010-08-23
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Photonic crystal composites-based wide-band optical collimator
http://aip.metastore.ingenta.com/content/aip/journal/jap/108/4/10.1063/1.3468242
10.1063/1.3468242
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