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A liquid crystal-based dynamically tunable photonic bandgap structure
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10.1063/1.3650454
/content/aip/journal/jap/110/8/10.1063/1.3650454
http://aip.metastore.ingenta.com/content/aip/journal/jap/110/8/10.1063/1.3650454
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Drawing of the microstrip photonic bandgap device, where copper is shown in black. The dimensions are to scale. The critical parameters t si and t sub are shown. The propagation axis, y, is found along the line of silicon squares. The x axis is parallel to the ground plane, and the z axis is perpendicular to the ground plane.

Image of FIG. 2.
FIG. 2.

Band structure of an infinite square lattice of squares (ε r = 7.91) in a background permittivity of 2.6 (solid line) and 3.1 (dashed line) as computed with the plane wave method (Ref. 47). The square width, w, is 50% of the lattice constant, a. Note that only the first section (Γ–X) applies to the fabricated device of the present work

Image of FIG. 3.
FIG. 3.

Simulated scattering parameter magnitudes of the entire microstrip photonic bandgap device depicted in Fig. 1 for each of the dielectric constants of BL006. This simulation was carried out with Ansoft HFSS v.12 and includes losses due to radiation, the dielectric, and the conductors. Note the substantial shift in bandgap.

Image of FIG. 4.
FIG. 4.

(Color online) Evaluation of the microstrip photonic bandgap device.

Image of FIG. 5.
FIG. 5.

Simulated and measured S11 (a) and S21 (b) magnitudes of the microstrip photonic bandgap device without an applied bias voltage. The simulated data are those of Fig. 3, which was produced by Ansoft HFSS. Excellent agreement is observed over the entire frequency band.

Image of FIG. 6.
FIG. 6.

Simulated and measured S11 (a) and S21 (b) magnitudes of the microstrip photonic bandgap device for an applied bias voltage of 20 Vpp. The simulated data are those of Fig. 3, which was produced by Ansoft HFSS. Excellent agreement is observed over the entire frequency band.

Image of FIG. 7.
FIG. 7.

Tuning of the S21 magnitude of the microstrip photonic bandgap device for bias voltages of 0 Vpp, 5 Vpp, 7.5 Vpp, 10 Vpp, and 20 Vpp. The darkness of the line indicates the voltage magnitude, where the extremes correspond to 20 Vpp and 0 Vpp.

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/content/aip/journal/jap/110/8/10.1063/1.3650454
2011-10-18
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: A liquid crystal-based dynamically tunable photonic bandgap structure
http://aip.metastore.ingenta.com/content/aip/journal/jap/110/8/10.1063/1.3650454
10.1063/1.3650454
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