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Liquid-crystal electric tuning of a photonic crystal laser
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View: Figures


Image of FIG. 1.
FIG. 1.

Scanning electron micrograph of fabricated 2D PC laser. Periodicity of holes is , radii of holes are , radius of defect hole is , slab thickness . Scale bar, .

Image of FIG. 2.
FIG. 2.

(Color) Cross section of the PC LC cell with simulated generated electric field. (a) Cross section of PC LC cell. (b) A 2D slice through the PC laser membrane shows the magnitude of the electric field generated by the electrodes. Field magnitude is denoted by normalized color scale from 0 to 1. (c) A close-up of the generated electric field in the defect hole. Arrow direction and length denote field direction and amplitude, respectively.

Image of FIG. 3.
FIG. 3.

(Color) Demonstration of laser tuning via LC realignment. (a) Laser spectra taken with an applied voltage ranging from 0 to across the LC cell. The threshold for tuning is , coinciding with the measured threshold voltage for the LC. A maximum blueshift of was measured with an applied . (b) Lasing wavelength vs applied voltage for a voltage ramp cycle. Although the tuning rate lessens at higher voltage, the data suggest saturation was not even reached at , and further tuning may be possible with stronger fields. The tuning is reversible but demonstrates a slight hysteresis at low fields which may be due to charging or impurity effects. The marker box height represents the upper bound of the uncertainty in the lasing wavelength obtained from the spectra.


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Scitation: Liquid-crystal electric tuning of a photonic crystal laser