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Active modulation of wavelength and radiation direction of fluorescence via liquid crystal-tuned surface plasmons
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Schematic diagram of geometry used to modulate the wavelength and the radiation direction of fluorescence of dyes via the LC-tuned SPs in a Kretschmann configuration. The dashed line shows the state of the plasmonic device with an external electric field. (b) The photographs of the LC cell with a polarizing microscope between crossed polarizers before (the upper photo) and after the voltage of 21 V was applied. (c) and (d) The angle-resolved reflectance spectra before and after the voltage of 15 V was applied. The dark colors stand for low reflectivity. The low reflectivity at an angle of 70–72° independent of the wavelength in (c) is an artifact, which is caused by detection instrument.

Image of FIG. 2.
FIG. 2.

(a) and (b) The fluorescence spectra of DCJTB and the reflectance spectra on the LC combined Kretschmann configuration under different applied voltages for LC when the detection angle was fixed at 75°. The black dashed line in (a) shows the fluorescence spectrum of the bulk DCJTB which was detected at the bottom of prism as in Figure 1(a) . The integration time for measuring bulk DCJTB (1 s) was different from others (5 s). (c) The angle-dependent intensities of the SP-coupled fluorescence of DCJTB at the emission wavelength of 700 nm under different applied voltages for LC. (d) The plots of the radiation angles (▪) and the wavelengths at the maximal fluorescence intensities (○) according to (a) and (c) vs. the applied voltages.

Image of FIG. 3.
FIG. 3.

Time response of the LC-tuned plasmonic device. (a) The changes of the reflective intensities at the detection angle of 75° with the repeat switch of 0 and 5 V. (b) is an enlarged curve of (a). The red line is the smoothed line using 4 point adjacent averaging method.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Active modulation of wavelength and radiation direction of fluorescence via liquid crystal-tuned surface plasmons