Single mode lasing in coupled nanowires

摘要

We demonstrate single mode lasing in coupled CdSe nanowires. By coupling two 420 nm diameter CdSe nanowires to form an X-structure cavity, single-mode lasing emission around 734.3 nm is obtained with line width of 0.11 nm and lasing threshold of about 120 μJ/cm~2. Mode selection in the lasing nanowire is realized via Vernier effect in the coupled cavities. Our results suggest a simple approach to single-mode nanowire lasers.