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. Author manuscript; available in PMC: 2017 Nov 29.
Published in final edited form as: Lab Chip. 2016 Nov 29;16(24):4770–4776. doi: 10.1039/c6lc01258b

Fig. 3.

Fig. 3

Comparison of lasing characteristics between target (red) and single-base-mismatched (black) DNA, 40 bases long: (a) Laser emission intensity as a function of the pump intensity. The lasing thresholds are 150 μJ/mm2 and 530 μJ/mm2 for the target and the single-base-mismatched DNA laser, respectively. The lasing efficiency also shows more than 5-fold decrease for the single-base-mismatched DNA sample. (b) Lasing spectra comparison when pump intensity is 500 μJ/mm2: Target DNA shows clear laser emission similar to Fig. 2(a), while the single-base-mismatch DNA shows zero signal. Through DNA hybridization, temperature is elevated to 55 °C to increase specificity. Note that the curves are vertically shifted for clarity.