Color Switching with Enhanced Optical Contrast in Ultrathin Phase-Change Materials and Semiconductors Induced by Femtosecond Laser Pulses

ACS Photonics ◽  
2015 ◽  
Vol 2 (2) ◽  
pp. 178-182 ◽  
Author(s):  
Franziska F. Schlich ◽  
Peter Zalden ◽  
Aaron M. Lindenberg ◽  
Ralph Spolenak
Keyword(s):  
Femtosecond Laser ◽  
Phase Change ◽  
Phase Change Materials ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Optical Contrast ◽  
Color Switching

scholarly journals Metal - Insulator Transition Driven by Vacancy Ordering in GeSbTe Phase Change Materials

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Valeria Bragaglia ◽  
Fabrizio Arciprete ◽  
Wei Zhang ◽  
Antonio Massimiliano Mio ◽  
Eugenio Zallo ◽  
...  
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Random Access ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Insulator Transition ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
Reversible Transformation ◽  
Vacancy Ordering

Abstract Phase Change Materials (PCMs) are unique compounds employed in non-volatile random access memory thanks to the rapid and reversible transformation between the amorphous and crystalline state that display large differences in electrical and optical properties. In addition to the amorphous-to-crystalline transition, experimental results on polycrystalline GeSbTe alloys (GST) films evidenced a Metal-Insulator Transition (MIT) attributed to disorder in the crystalline phase. Here we report on a fundamental advance in the fabrication of GST with out-of-plane stacking of ordered vacancy layers by means of three distinct methods: Molecular Beam Epitaxy, thermal annealing and application of femtosecond laser pulses. We assess the degree of vacancy ordering and explicitly correlate it with the MIT. We further tune the ordering in a controlled fashion attaining a large range of resistivity. Employing ordered GST might allow the realization of cells with larger programming windows.

Reversible Optical Switching of Infrared Antenna Resonances with Ultrathin Phase-Change Layers Using Femtosecond Laser Pulses

ACS Photonics ◽  
2014 ◽  
Vol 1 (9) ◽  
pp. 833-839 ◽  
Author(s):  
Ann-Katrin U. Michel ◽  
Peter Zalden ◽  
Dmitry N. Chigrin ◽  
Matthias Wuttig ◽  
Aaron M. Lindenberg ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Phase Change ◽  
Optical Switching ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses

Observation of crystallization in amorphous phase change films induced by femtosecond laser pulses

2005 ◽  
Author(s):  
Guangjun Zhang ◽  
Donghong Gu ◽  
Xiongwei Jiang ◽  
Qingxi Chen ◽  
Fuxi Gan
Keyword(s):  
Femtosecond Laser ◽  
Phase Change ◽  
Amorphous Phase ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses

scholarly journals Coherent scatter-controlled phase-change grating structures in silicon using femtosecond laser pulses

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Yasser Fuentes-Edfuf ◽  
Mario Garcia-Lechuga ◽  
Daniel Puerto ◽  
Camilo Florian ◽  
Adianez Garcia-Leis ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Phase Change ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Coherent Scatter

Melting, Vaporization, and Resolidification in a Thin Gold Film Irradiated by Multiple Femtosecond Laser Pulses

2013 ◽  
Vol 135 (2) ◽  
Author(s):  
Yijin Mao ◽  
Yuwen Zhang ◽  
J. K. Chen
Keyword(s):  
Liquid Phase ◽  
Femtosecond Laser ◽  
Phase Change ◽  
Gold Film ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Pulse Number ◽  
Ablation Depth ◽  
Maximum Temperature ◽  
Clapeyron Equation

Melting, vaporization, and resolidification in a gold thin film subject to multiple femtosecond laser pulses are numerically studied in the framework of the two-temperature model. The solid-liquid phase change is modeled using a kinetics controlled model that allows the interfacial temperature to deviate from the melting point. The kinetics controlled model also allows superheating in the solid phase during melting and undercooling in the liquid phase during resolidification. Superheating of the liquid phase caused by nonequilibrium evaporation of the liquid phase is modeled by adopting the wave hypothesis, instead of the Clausius–Clapeyron equation. The melting depth, ablation depth, and maximum temperature in both the liquid and solid are investigated and the result is compared with that from the Clausius–Clapeyron equation based vaporization model. The vaporization wave model predicts a much higher vaporization speed, which leads to a deeper ablation depth. The relationship between laser processing parameters, including pulse separation time and pulse number, and the phase change effect are also studied. It is found that a longer separation time and larger pulse number will cause lower maximum temperature within the gold film and lower depths of melting and ablation.

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