(Color online) (a) Calculated spectra of the defectless metallic photonic crystal. (b) A defect mode due to the defect layer between the second and the third layer of the metallic photonic crystal.
(Color online) (a) A schematic drawing of the tunable THz filter. The liquid crystal is embedded between the second and the third layers of the metallic photonic crystal. (b) The distribution of electric potential as a function of spatial coordinate (x, y) at different depth z = 0∼50 μm across LC layer from an electrode surface. The electric potential is almost uniform throughout the surface laterally that has the same depth (z) from an electrode.
(Color online) (a) Experimental waveforms of the THz pulse transmitted through the empty and LC cells at different alignment (ordinary vs extraordinary). (b)The calculated transmission characteristics of the filter. The two alignments of the liquid crystal are shown in the insets.
The peak position (solid circle) of the filter and the refractive index (open circle) of the LC as a function of the applied bias. The director angle of the LC is shown schematically in the inset.
Time dependent refractive index (dashed line) and normalized transmission (solid line) by frequency modulation. (a) Decay response with frequency changed from 1 to 100 kHz and (b) rise response with frequency changed from 100 to 1 kHz.
Article metrics loading...
Full text loading...