Crystallization of Ge8Sb2‐xBixTe11 thin films employing single femtosecond pulses

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F18%3A00494423" target="_blank" >RIV/61389021:_____/18:00494423 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Crystallization of Ge8Sb2‐xBixTe11 thin films employing single femtosecond pulses

Original language description

Recently, phase transition driven by an ultrafast (femtosecond or picosecond) pulsed laser has attracted increasing attention in attempts to increase the speed of the phase change processes [1−4]. Optical recording was the first demonstrated in 1992 with using ultrashort laser pulses. The advantage of this technology is that ultrafast lasers have potentials to resolve the heat diffusion limitation of the conventiona laser recording, achieving high area recording densities. The phase transition of Ge 8 Sb 2-x Bi x Te 11 (were x=0, 1, 2) thin films from the amorphous phase into the crystalline phase induced by single femtosecond pulses of 800 nm and 40 fs has been studied. It was established the pulse energy window for crystallization in the thin films with thickness 100 nm prepared by Flash Thermal Evaporation (FE). The crystallization ofmarks written in amorphous background by single fs pulses were characterized using anoptical microscope AXIO ZEISS. The topology of shot point was observed by WLI and AFM. The phase transition induced by the single and double femtosecond shots in the active Ge 8 Sb 2-x Bi x Te 11 layer was examined using X-ray diffraction (XRD), which confirmed the crystalline structure of thin films after single fs shot. The reflectivity difference between the amorphous and laser-induced crystalline phases upon fs irradiation was investigated by WASE. The optical contrast for fs-irradiated films was more as 25 %, which is relatively high value for optical recording.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

10402 - Inorganic and nuclear chemistry

Project

<a href="/en/project/LO1206" target="_blank" >LO1206: Modern optical systems and technologies</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů