Whispering Gallery Mode Lasing from Zinc Oxide Hexagonal Nanodisks

被引:232
作者
Gargas, Daniel J. [1 ,2 ]
Moore, Michael C. [1 ,2 ]
Ni, Adrian [3 ]
Chang, Shu-Wei [3 ]
Zhang, Zhaoyu [1 ,2 ]
Chuang, Shun-Lien [3 ]
Yang, Peidong [1 ,2 ]
机构
[1] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA
[2] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA
[3] Univ Illinois, Dept Elect & Comp Engn, Urbana, IL 61801 USA
关键词
ZnO; lasing; whispering gallery; disk; mode simulation; MICRODISK; EMISSION; LASER;
D O I
10.1021/nn9018174
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Disk-shaped semiconductor nanostructures provide enhanced architectures for low-threshold whispering gallery mode (WGM) lasing with the potential for on-chip nanophotonic integration. Unlike cavities that lase via Fabry-Perot modes, WGM structures utilize low-loss, total internal reflection of the optical mode along the circumference of the structure, which effectively reduces the volume of gain material required for lasing. As a result, circularly resonant cavities provide much higher quality (Q) factors than lower reflection linear cavities, which makes nanodisks an ideal platform to investigate lasing nanostructures smaller than the free-space wavelength of light (i.e., subwavelength laser). Here we report the bottom-up synthesis and single-mode lasing properties of individual ZnO disks with diameters from 280 to 900 nm and show finite difference time domain (FDTD) simulations of the whispering gallery mode inside subwavelength diameter disks. These results demonstrate ultraviolet WGM lasing in chemically synthesized, isolated nanostructures with subwavelength diameters.
引用
收藏
页码:3270 / 3276
页数:7
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