1. [1] H. Grube, B. C. Harrison, J. Jinfeng, and J. J. Boland, Rev. Sci. Instr. 72, 4388 (2001).
2. [2] H. Watanabe, C. Manabe, T. Shigematsu, and M. Shimizu, Appl. Phys. Lett. 78, 2928 (2001).
3. [3] H. Watanabe, C. Manabe, T. Shigematsu, K. Shimotani, and M. Shimizu, Appl. Phys. Lett. 79, 2462 (2001).
4. [4] M. A. Paesler and P. J. Moyer, Near-field optics (Wiley, New York, 1996).
5. [5] R. C. Dunn, Chem. Rev. 99, 2891 (1999).