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Opt Express. 2013 Sep 23;21(19):22314-9. doi: 10.1364/OE.21.022314.

Multicolour laser from a single bandgap-graded CdSSe alloy nanoribbon.


Multicolour lasing with wavelength varying from 578 nm to 640 nm is realized from a single bandgap-graded CdSSe alloy nanoribbon, by selecting the excited spot at room temperature. Though reabsorption is a serious problem to achieve lasing at short wavelength, multiple scatters on the nanoribbon form localized cavities, and thus lasing at different wavelengths is realized. By increasing the excitation area, multicolour lasing from the same nanoribbon is also observed simultaneously.

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