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(a) Lasing spectra of PhC nanocavities with different periods measured at with pulsed excitation. The peak at is the PL from the excitonic state of the QW. (b) plot of the PhC nanocavity laser with lasing at . The inset is the scanning electron microscope of the top view of the PhC.
(a) PL spectrum of the PhC nanocavity with cw excitation at . The small peak at is the photon emission at the lowest-order cavity mode. (b) PLE signal intensity measured at the lowest-order cavity mode. The PLE peak observed at indicates the existence of a higher-order cavity mode.
(a) plots of the PhC nanocavity laser measured at with different central excitation wavelengths of (nonresonant excitation) and (resonant excitation) at . (b) The values of the laser threshold (black circle) and slope efficiency (square) measured at various excitation wavelengths. The white circles indicate the estimated laser threshold at cw excitation obtained by the deconvolution of the spectrally broad femtosecond pump pulse and cavity mode. (c) The products of the values of experimental laser threshold and slope efficiency at various excitation wavelengths.
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