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(a) PL spectra excited by a 325 nm He–Cd laser. The induced PL signal increased as the irradiation laser power increased. The inset is the excitation spectrum measured for the 430 nm emission. (b) PL spectra obtained with a 442 nm excitation source. (c) ESR spectral change.
Spot images taken by a confocal microscope and corresponding signal profiles. Spots were formed with a pulse energy of (a) and (b) .
Confocal microscopic images of the first layer (a) and the fifth layer (b). [(c) and (d)] are the fluorescent images of the same layers, respectively. All bits were formed by single-shot irradiation with the energy of .
Axial profiles of the reflection signal (a) and fluorescent signal (b) measured along the lines marked in Fig. 3.
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