1. (1) Oumi, M., Kasama, N., Maeda, H., Kato, K., Shinohara, Y., Niwa, T., Mitsuoka, Y., Near-field Generating Element, Near-field Optical Recording Device, and Near-field Optical Microscope., (in Japanese), Japanese Patent, Application Number P2001-118543,2001 (Open to Public on Jan. 8th, 2003, Publication Number P2003-4622A)
2. (2) Tanaka, K., Oumi, M., Niwa, T., Ichihara, S., Mitsuoka, Y., Nakajima, K., Ohkubo, T. Hosaka, H., Itao, K., High Spatial Resolution and Throughput Potential of an Optical Head with a Triangular Aperture for Near-Field Optical Data Storage. Jpn. J. of Appl. Phys., Vol. 42, No. 2, (2003), pp.1113-1117.
3. (3) Hirata, M., Oumi, M., Shibata, K., Nakajima, K., Ohkubo, T., Triangular Aperture as Near-Field Element for High-Density Storage., IEICE Trans. Electron., Vol. E90-C, No. 1, (2007), pp.102-109.
4. (4) Naber, A., Molenda, U., Fisher U. C., Maas, H. -J., Höppener, C., Lu, N. and Fuchs, H., Enhanced Light Confinement in a Near-Field Optical Probe with a Triangular Aperture, Phys. Rev. Lett., 89, 21, (2002) 210801
5. Writing 40 nm marks by using a beaked metallic plate near-field optical probe