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Electrically reconfigurable optical metamaterial based on colloidal dispersion of metal nanorods in dielectric fluid
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Image of FIG. 1.
FIG. 1.

Flat glass sample (1) with two electrodes [(2) and (3)], filled with short Au NRs dispersed in toluene (4). At zero field, the dispersion is isotropic (a) and produces a dark texture (b) under the microscope with crossed polarizers A and P. When the voltage in on , a birefringent cloud of aligned NRs accumulates near the electrode (2) [(c) and (d)].

Image of FIG. 2.
FIG. 2.

(a) Applied voltage causes an increase in the filling factor that changes along the axis marked in Fig. 1(d); data are presented for short NRs; (b) the long NRs assembly is birefringent near the electrode (2); the effective optical phase retardation is measured as a function of in the circular region marked in Fig. 1(d).

Image of FIG. 3.
FIG. 3.

(a) Cylindrical glass capillary (1) with an axial copper wire electrode (2) and a transparent electrode at the outer surface (3), filled with long Au NRs in toluene (4), and fixed in polymerized optical adhesive (5). Microscope textures (parallel polarizers) of a capillary filled with the long NRs when the field is off (b) and on, (c). Electric field-induced redistribution of Au NRs changes the profile of light transmission through the capillary for the light polarization perpendicular to the capillary (d), but not for parallel to the capillary (e). Continuous trace: field on, dashed trace: field off.

Image of FIG. 4.
FIG. 4.

Periodic change in visibility of the central electrode in a cylindrical capillary filled with dispersion of short Au NRs in toluene, under the applied voltage , 100 kHz, modulated with a frequency of 0.5 Hz. Observation under the microscope with light polarized normally to the capillary axis. (enhanced online). [URL: http://dx.doi.org/10.1063/1.3278442.1]10.1063/1.3278442.1



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Scitation: Electrically reconfigurable optical metamaterial based on colloidal dispersion of metal nanorods in dielectric fluid