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ZnO lasing in complex systems with tetrapods |
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| Authors: | V M Markushev V V Ursaki M V Ryzhkov C M Briskina I M Tiginyanu E V Rusu A A Zakhidov |
| Institution: | (1) Institute of Radio Engineering and Electronics of RAS, 11, Mokhovaya St., Moscow, 125009, Russia;(2) Laboratory of Low-Dimensional Semiconductor Structures, Institute of Applied Physics, Academy of Sciences of Moldova, Academy str. 5, Chisinau, 2028, Moldova;(3) NanoTech Institute, University of Texas at Dallas, MS BE26 Box 830688, Richardson, TX 75083-0688, USA |
| Abstract: | A ZnO structure in the form of a core–shell wire was grown with a modified vapour transport and condensation method. The wire consists of a dense core which may play the role of a waveguide and a shell formed mainly from tetrapod-type crystallites. The high optical quality of the produced ZnO material is confirmed by continuous wave photoluminescence (PL) analysis demonstrating that low- temperature PL is related to the recombination of bound excitons, while room-temperature PL is due to free excitons. Good quality of the crystal structure is demonstrated also by the Raman spectrum. The shell of the wire exhibits room-temperature laser action due to lasing modes in tetrapods under the excitation by nanosecond laser pulses. The nature of the lasing modes is discussed. A simplified model for one of the possible modes is suggested. |
| Keywords: | PACS" target="_blank">PACS 89 20 Bb 42 60 Jf 42 70 Hj |
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