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5 results on '"Mu, Zhangjian"'

2. A Raman study on nanosecond-laser-induced multi-level switching of Ge2Sb2Te5 thin films

Author

Lan Li, Mu Zhangjian, Junying Li, and Du Jia

Subjects
Materials science, business.industry, Pulse duration, Laser, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Amorphous solid, law.invention, symbols.namesake, law, symbols, Optoelectronics, Electrical and Electronic Engineering, Thin film, Photonics, Crystallization, Joule heating, Raman spectroscopy, business
Abstract

As one of the most successful nonvolatile phase change materials (PCMs), Ge2Sb2Te5 (GST) can be reversibly switched between amorphous and crystalline phases by nanosecond laser pulses, which enables its applications in optical disks and various emerging reconfigurable photonic devices. Instead of simply inducing temperature rising of GST thin film via light absorption, high-energy laser irradiation leads to modifications of molecular bonds, forming different local structures. We employed a nanosecond pulse laser with different pulse duration, energy and pulse numbers to induce multi-level switching of GST thin films. By employing Raman spectroscopy, we illustrated that GeTe4–nGen (n = 0, 1, 2) subsystem plays a decisive role in laser-induced crystallization of GST. Different from isothermal annealing, where SbmTe3 (m = 1, 2) subsystem contributes as well. This is evidenced by the suppression of SbmTe3 structure of an isothermally annealed film treated with additional laser crystallization. In addition, our investigations indicated that in GeTe4–nGen subsystem, Joule heating promotes the formation of Te-rich tetrahedral components. These findings provide more insights into the structural characteristics of GST.

Published
2021

4. Numerical Investigation of a Short Polarization Beam Splitter Based on Dual-Core Photonic Crystal Fiber with As2S3 Layer.

Author

Chen, Nan, Zhang, Xuedian, Lu, Xinglian, Zhang, Zheng, Mu, Zhangjian, and Chang, Min

Subjects
PHOTONIC crystal fibers, BEAM splitters, OPTICAL modulation, INSERTION loss (Telecommunication), FINITE element method, OPTICAL fibers
Abstract

A polarization beam splitter is an important component of modern optical system, especially a splitter that combines the structural flexibility of photonic crystal fiber and the optical modulation of functional material. Thus, this paper presents a compact dual-core photonic crystal fiber polarization beam splitter based on thin layer As2S3. The mature finite element method was utilized to simulate the performance of the proposed splitter. Numerical simulation results indicated that at 1.55 μm, when the fiber device length was 1.0 mm, the x- and y-polarized lights could be split out, the extinction ratio could reach −83.6 dB, of which the bandwidth for extinction ratio better than −20 dB was 280 nm. It also had a low insertion loss of 0.18 dB for the x-polarized light. In addition, it can be completely fabricated using existing processes. The proposed compact polarization beam splitter is a promising candidate that can be used in various optical fields. [ABSTRACT FROM AUTHOR]

Published
2020
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5. Numerical Investigation of a Short Polarization Beam Splitter Based on Dual-Core Photonic Crystal Fiber with As 2 S 3 Layer.

Author

Chen N, Zhang X, Lu X, Zhang Z, Mu Z, and Chang M

Abstract

A polarization beam splitter is an important component of modern optical system, especially a splitter that combines the structural flexibility of photonic crystal fiber and the optical modulation of functional material. Thus, this paper presents a compact dual-core photonic crystal fiber polarization beam splitter based on thin layer As 2 S 3 . The mature finite element method was utilized to simulate the performance of the proposed splitter. Numerical simulation results indicated that at 1.55 μm, when the fiber device length was 1.0 mm, the x- and y-polarized lights could be split out, the extinction ratio could reach -83.6 dB, of which the bandwidth for extinction ratio better than -20 dB was 280 nm. It also had a low insertion loss of 0.18 dB for the x-polarized light. In addition, it can be completely fabricated using existing processes. The proposed compact polarization beam splitter is a promising candidate that can be used in various optical fields.

Published
2020
Full Text
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