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现在的比特记录型光记录的记录密度受衍射极限的限制.为突破此极限,则利用近场光学对光记录进行了研究.作者提出一种专门用来读取高记录密度媒体的系统,该系统采用了无孔径近场显微镜技术.对其可行性进行了实验上和理论上的探讨,并指出可以兆赫兹的速率读取256Gbits/in~2的记录密度.系统是一种采用了原子力显微镜的反射式无孔径型近场显微镜,用光信号的相位变化读取探头与样品间的相互作用.用原子力显微镜的引力进行距离控制,探头以1～5MHz振动.在实验中,将电子束曝光获得的实验用图案(256Gbits/in~2在10nm距离的位置进行探头扫描,以30dB的S/N读取.此外,根据测定信号的谱图,可以得出能以8
Now that the recording density of bit-recorded optical recording is limited by the diffraction limit, optical recording has been studied using near-field optics to break this limit.The author proposes a system specifically for reading high recording density media that The system uses a non-aperture near-field microscopy technique to experimentally and theoretically investigate its feasibility and points out that 256 Gbits / in ~ 2 recording density can be read at a megahertz rate. The system is an atomic force microscope Of the reflection-type non-aperture near-field microscopy, the phase change of the optical signal to read the interaction between the probe and the sample. Atomic force microscope distance control, the probe vibration at 1 ~ 5MHz.In the experiment, the electron beam exposure The obtained experimental pattern (256 Gbits / in ~ 2 at a distance of 10 nm was scanned by a probe and read at 30 dB S / N. Further, based on the measurement signal spectrum,