Measurement technology plays an important role in the area of optical storage, a multifunctional quasi-dynamic static
optical recording tester, which can also be used as nanometer laser direct writing lithography system, is designed and
constructed for optical storage in this paper. The primary characteristics of the system are presented in detail, some
experimental results are also given to show that the tester perform successfully, acting as a research platform for both
optical storage and laser direct writing lithography.
Transparency conversion mechanism and laser induced fast response velocity of bimetallic Bi/In thin film is studied.
Heat-treatment and laser exposure with different pulse width induced transparency is investigated by using
ultraviolet-visible (UV-VIS) spectrometer, X-ray diffraction (XRD), Auger Electron Scan (AES), microscope and field
emission scanning electron microscopy (FESEM). Research results show that oxidation is regarded as the reason for heat
treated and long-pulsed laser exposure induced transparency conversion. Laser ablation is demonstrated to be the main
reason for short-pulsed (~7ns) laser induced transparency conversion. For Bi/In thin film covered with a protection layer
of (ZnS)0.85(SiO2)0.15 thin film, it exhibit fast response as fast as less than 100ns. The conclusions contribute to
understanding and development of materials for thermal resist, photomask, optical storage medium and transparent
conductive oxide with better performance.
KEYWORDS: Continuous wave operation, Near field, Signal processing, Pulsed laser operation, Super resolution, Dielectrics, Near field optics, Semiconductor lasers, Light sources, Picosecond phenomena
In this paper, functions of bubble pit that is formed in a recording process of a super-resolution near-field structure
(super-RENS) disk are discussed. The result shows that the recorded bubble pit has a greatly influence on both writing
and reading for super-RENS disk. The relationship between the bubble pit and readout signal is also investigated.
The optical reflectance and transmittance of Platinum oxide (PtOx) and palladium oxide (PdOx) mask layer, which are used to super-resolution near-field structure (super-RENS) disk, are investigated using Z-scan technique, under blue laser (442 nm) irradiation. The power thresholds of the PtOx and PdOx decomposition are obtained; the reversible and irreversible features for the two kinds of mask layers are cleared. Deformation in the micro irradiation region on surface of the mask samples, which is formed by decomposition of the PtOx or PdOx driving the Z-scan, is analyzed by means of an atom force microscope (AFM). The deformation analyses agree well with the Z-scan results. The optical features obtained at 442nm wavelength are compared with those at 532-nm wavelength, and the power threshold difference between the two wavelengths is also analyzed in detail based on irradiation power density and absorption spectrum of the mask samples.
KEYWORDS: Reflectivity, Near field optics, Transmittance, Atomic force microscopy, Signal detection, Near field scanning optical microscopy, Particles, Image analysis, Super resolution, Near field
The bubble’s functions in readout process for PdOx and PtOx superresolution near-field structure (super-RENS) disk are studied with the PdOx and PtOx mask sample and with a repetitive Z-scan method. The results indicate that the optical responses on transmittance and reflectance are related to shape and size of the bubble. The deformation of bubbles before and after repetitive scan is observed by an optical microscope, and the sizes of the bubbles corresponding to different repetitive Z-scan order of times are analysed by an atomic force microscope.
KEYWORDS: Nonlinear optics, Near field, Super resolution, Oxides, Optical storage, Near field optics, Metals, Particles, Signal detection, Light scattering
Nonlinear properties and response mechanisms of PtO2 and PdO1.1 mask layers for optical data storage with super-resolution near-field structure were investigated. The results obtained from Z-scan measurement was supported by microscopic observation studies. The 5.1 mW and 6.5 mW, respectively, as the decomposition threshold of the PdO1.1 and PtO2 for leading to metallic nano-particles were confirmed. The scanned PdO1.1 and PtO2 mask samples could be retrieved at less than their own threshold values. It was also found for the PdO1.1 and PtO2 mask samples that the nonlinear optical response not only came from the metallic particles but also from the bubble deformation.
A more actual situation is studied on the effects of both inclined grating planes in Talbot interferometry illuminated by a plane wave. In the situation, the two grating planes are first rotated around their own axis parallel to the line direction, and then detector grating is rotated by an angle around the normal of the grating plane. Theoretical analyses indicate that the tilt-angle of the moire fringes is sensitive to the inclination. The results in this paper are also compared with those in one of our earlier works.
The effects of a small inclination between the two grating planes on the moire fringes in Talbot mterferometry are studied
for the most general case of an arbitraiy inclination under the illumination of a plane wave. The inclination is generated by
rotating the beam-splitter grating by two small angles around the two perpendicular axes laid on the grating plane and when
both axes have an arbitrary angle with respect to the line direction of the grating. Some simple judgement and adjustment
methods for the inclination are presented. The results obtained by theoretical analysis are also verified by experiments.
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