The Ge 100 x Cu x thin films (x = 50 at %-69 at %) were deposited on nature oxidized Si (100) wafer by dc co-sputtering of Ge and Cu targets. Microstructures was analyzed by X-ray diffractometer. The optical and thermal properties were measured from static test. It was found that the as-deposited phase was single supersaturated -Cu 3 Ge phase and it was transformed to Ge and -Cu 3 Ge coexisting phases after annealing at 400 C. The reflectivity of as-deposited film was higher than that of annealed film.
Both a new write-once medium with a sputtered NiO
x
film and a write-once optical disk using a blue laser has been fabricated. The optical constant of sputtered NiO
x
films for different ratios of O2/Ar was determined, and showed little dependence on sputtering ratios of O2/Ar and wavelength. The X-ray photoelectron spectra (XPS) data indicated those films have two major components, NiO and Ni2O3. Most NiO
x
films released oxygen gradually below 300°C. Over 300°C, there was an apparent transition due to the decomposition of the Ni2O3. At a writing power of 12 mW and a reading power of 0.5 mW under conditions of a numerical aperature (NA) of 0.65 and a wavelength of 405 nm, the carrier to noise ratio (CNR) was more than 47 dB and jitter was less than 13%. The recording principle depends primarily on the explosive pressure of the O2 released due to laser heating of the NiO
x
film.
Background/AimsTo validate the effectiveness of a newly developed light-emitting diode (LED)-narrow band imaging (NBI) system for detecting early malignant tumors in the oral cavity.MethodsSix men (mean age, 51.5 years) with early oral mucosa lesions were screened using both the conventional white light and LED-NBI systems.ResultsSmall elevated or ulcerative lesions were found under the white light view, and typical scattered brown spots were identified after shifting to the LED-NBI view for all six patients. Histopathological examination confirmed squamous cell carcinoma. The clinical stage was early malignant lesions (T1), and the patients underwent wide excision for primary cancer. This is the pilot study documenting the utility of a new LED-NBI system as an adjunctive technique to detect early oral cancer using the diagnostic criterion of the presence of typical scattered brown spots in six high-risk patients.ConclusionsAlthough large-scale screening programs should be established to further verify the accuracy of this technology, its lower power consumption, lower heat emission, and higher luminous efficiency appear promising for future clinical applications.
Along with the development of high definition televisions (HD-TVs), some high density optical discs are demanded to have a capacity of up to 25 Gbytes on a single layer at a single surface. The capacity on single layer may even reach up to 100 Gbytes in the near future, which requires the size of recording to be minimized to less than 100 nm. In this study, ultra high resolution patterns (<100 nm) formation by conventional laser beam recorder using the inorganic spin-coatable photoresist and without additional development or etching process is demonstrated. The recording spot size of laser beam recorder (LBR) can be reduced effectively by using this spin coatable inorganic photoresist.
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