Abstract
Investigation focuses on the local strain-stress field in the laser-beam-spot region in super resolution near-field structure. The three-dimensional finite element method is used to analyze the elastic thermal expansion in the readout process. The temperature distribution around the laser beam in a large laser power margin has been studied, and it may be related to the second phase transition. The investigation has revealed that the center of the laser beam is always ahead of the centers of the peak-temperature, peak-stress, and peak-strain regions so that the stress and strain are very different around the center of the laser beam. This may lead to the change of the optical properties. The super-resolution mechanism caused by the local thermal expansion is discussed.