Archive > Volume 11 Issue 2 > 2015,11(2):103-106. DOI:10.1007/s11801-015-4237-5 CSTR:[cstr] Prev Next
Profile-broaden ultraviolet lasing from whispering gallery mode cavity in crown-like zinc oxide
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Abstract:
The crown-like zinc oxide (ZnO) samples, which are composed of a hexagonal cap and a tower-like shaft, are prepared by vapor transport method. The hexagonal cap, working as a whispering gallery mode (WGM) resonant cavity, demonstrates density-dependent ultraviolet (UV) lasing emission with a broadened and squared photoluminescence (PL) profile under UV excitation at 355 nm. Theoretical analyses based on Fermi golden rule show that the broadened spectrum profile results from the special optical mode density characteristics in a WGM micro-cavity, which is in agreement with the observed results.
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This work has been supported by the National Natural Science Foundation of China (Nos.60725413 and 61401173), the National Spark Program (No.2013GA690405), the Natural Science Foundation of Education Bureau of Jiangsu Province (Nos.12KJD510003 and 13KJD510002), and the Natural Science Foundation of Anhui Province in China (No.11040606M10).
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