Imaging of optical disc using reflection-mode scattering-type scanning near-field optical microscopy.
A phase-change optical disc was observed using a reflection-mode scattering-type scanning near-field optical microscope (RS-SNOM). In an a.c.-mode SNOM image, the 1.2 microm x 0.6 microm recording marks were successfully observed although the data were recorded on the groove. In contrast, no recording marks could be resolved in a d.c.-mode SNOM image. These results are in good agreement with those from a numerical simulation using the finite difference time domain method. The resolution was better than 100 nm with a.c.-mode SNOM operation and the results indicate that recording marks in phase-change optical media can be directly observed with the RS-SNOM.
Yamaguchi
M
M
Olympus Optical Co., Ltd., Tokyo, Japan. m_yamaguchi@ot.olympus.co.jp
Sasaki
Y
Y
Sasaki
H
H
Konada
T
T
Horikawa
Y
Y
Ebina
A
A
Umezawa
T
T
Horiguchi
T
T