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Microstructural and optical analysis of superresolution phenomena due to Ge2Sb2Te5 thin films at blue light regime
- Authors
- Lee, Hyun Seok; Lee, Taek Sung; Lee, Yongwoon; Kim, Jooho; Lee, Suyoun; Huh, Joo-Youl; Kim, Donghwan; Cheong, Byung-ki
- Issue Date
- 1-12월-2008
- Publisher
- AMER INST PHYSICS
- Keywords
- antimony alloys; germanium alloys; laser beam effects; optical saturation; tellurium alloys; thin films; transmission electron microscopy
- Citation
- APPLIED PHYSICS LETTERS, v.93, no.22
- Indexed
- SCIE
SCOPUS
- Journal Title
- APPLIED PHYSICS LETTERS
- Volume
- 93
- Number
- 22
- ISSN
- 0003-6951
- Abstract
- Superresolution (SR) phenomena due to Ge2Sb2Te5 films were examined by combined analysis of the transmission electron microscopy (TEM) microstructures of the laser-irradiated films and the results from dynamic and static tests using blue lasers. A new finding was made that comprises a complementary case of the classical SR readout by Ge2Sb2Te5 film; an amorphous band instead of a closed aperture of melt in the crystalline background forms behind a moving laser but still produces a high SR signal. A complete carrier-to-noise-ratio curve of a SR-read-only memory employing Ge2Sb2Te5 may be derived from a nonlinear optical effect, specifically thermally assisted saturable absorption.
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