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(a) Experimental set-up schemes for optical measurements. For micro-absorption measurement, the lens (f = 30 cm) is replaced by an objective (40×), (b) The bright field image, and (c) the micro-absorption spectrum of a single CdS microwire.
Two-photon pumped room-temperature emission spectra from the end facet of the microwire as excitation energy density increases, keeping the polarization direction parallel to the sample axis ( ). The insets show the dark-field images corresponding to spontaneous emission, amplified spontaneous emission, and lasing oscillation, respectively. The scale bar represents 10 μm in length.
Integrated emission intensity versus the excitation energy densities at θ = 0° (squares), (circles), and (triangles), respectively.
Polar plot of integrated emission intensity as a function of the different polarization angles at the excitation density of 5.0 mJ/cm2.
The cross section field distribution of the y-z plane at x = 0 in CdS microwire at three different polarization angles. The incident light was normal incident on the microwire, propagating along x-axis. (a) θ = 0°, (b) θ = 45°, and (c) θ = 90°. The diameter and length are 1 μm and 28 μm (rectangular dashes).
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