Near-field probing of photonic crystal directional couplers

✍ Scribed by V. S. Volkov; S. I. Bozhevolnyi; P. I. Borel; L. H. Frandsen; M. Kristensen

• Publisher: John Wiley and Sons
• Year: 2006
• Tongue: English
• Weight: 183 KB
• Volume: 3
• Category: Article
• ISSN: 1612-2011
• DOI: 10.1002/lapl.200610012

✦ Synopsis

We report the design, fabrication and characterization of a photonic crystal directional coupler with a size of ∼20×20 μm^2^fabricated in silicon-on-insulator material. Using a scanning near-field optical microscope we demonstrate a high coupling efficiency for TM polarized light at telecom wavelengths. By comparing the near-field optical images recorded in and after the directional coupler area, the features of light distribution are analyzed. Finally, the scanning near-field optical microscope observations are found to be in agreement with the transmission measurements conducted with the same sample.