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  Physics Express 2011, 1: 10
  Research Article
Ultrasmall optical beam splitters assembled by polymer nanowires
  Xiaobo Xinga,b, Heng Zhua, Yuqing Wanga, Baojun Lia,*  
a State Key Laboratory of Optoelectronic Materials and Technologies School of Physics and Engineering, Sun Yat-Sen University, Guangzhou 510275, China
b Department of Chemistry, Jinan University, Guangzhou 510632, China

  We report 2?2 and 3?3 optical beam splitters with ultrasmall coupling region assembled by twisting flexible poly(trimethylene terephthalate) (PTT) nanowires. The coupling region of the 2?2 splitter is 1.16-?m wide and 2-?m long, and that of the 3?3 splitter is 1.23-?m wide and 12-?m long. The measured excess loss of the splitters is 0.6 to 0.75 dB. For a specific operation wavelength and/or input branch, desirable splitting ratios can be obtained and tuned by changing the input/output branching angles.
  Optical beam splitter; Coupler; Nanowire; Polymer  

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