Title :
Investigation of the ultraviolet lasing characteristics of zinc hexagonal microtubes
Author :
Yu, S.F. ; Sun, X.W. ; Yuen, C. ; Lau, S.P.
Author_Institution :
Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore
Abstract :
Prismatic zinc oxide (ZnO) hexagonal microtubes have been fabricated on silicon substrate by vapor transport. It is shown that the ZnO hexagonal microtubes have demonstrated ultraviolet (∼393 nm) lasing emission under 355 nm optical excitation. Furthermore, the lasing as well as modal characteristics of the microtube lasers are investigated theoretically. It can be explained that the high threshold pump intensity of the microtube lasers is due to high radiation loss near the prismatic facets. In addition, our calculation has shown that the output beam from the microtube lasers has a shape similar to the doughnut ring, which can find application as laser tweezers to trap low refractive index small particles.
Keywords :
II-VI semiconductors; laser beams; laser modes; laser transitions; microcavity lasers; optical fabrication; optical pumping; radiation pressure; semiconductor lasers; wide band gap semiconductors; zinc compounds; 355 nm; Si; ZnO; doughnut ring; laser trapping; laser tweezers; microtube lasers; modal characteristics; optical excitation; prismatic zinc oxide; radiation loss; ultraviolet lasing characteristics; vapor transport; zinc hexagonal microtubes; Laser excitation; Laser theory; Optical pumping; Optical refraction; Optical variables control; Pump lasers; Ring lasers; Silicon; Stimulated emission; Zinc oxide;
Conference_Titel :
Numerical Simulation of Semiconductor Optoelectronic Devices, 2003. NUSOD 2003. Proceedings of the IEEE/LEOS 3rd International Conference on
Print_ISBN :
0-7803-7992-6
DOI :
10.1109/NUSOD.2003.1259048
