Design of low loss 1 × 1 and 1 × 2 phase-change optical switches with different crystalline phases of Ge2Sb2Te5 films

Li, Y; Liu, Furong; Han, Gang; Chen, Q Y; Zhao, Zihan; Xie, Xuanxuan; Huang, Yan; Yuan, Yukang

doi:10.1088/1361-6528/aba928

Cited by 5 publications

(2 citation statements)

References 46 publications

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“…For a-GST, the mode profile is almost bounded in Si waveguide because of the low refractive index. Once the GST is transformed to crystalline phase, as shown in figure 2(b), the mode profile is dramatically moved to the GST film due to the large refractive index, indicating strong evanescent coupling effect, which is consistent with the description of the previous study [35]. Figures 2(c), (d) show the real part of the effective refractive index and mode loss of GST with different thickness and width, respectively.…”

Section: Mode Analysissupporting

confidence: 86%

Design of an electric-driven nonvolatile low-energy-consumption phase change optical switch

Liu

Han

et al. 2021

Nanotechnology

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Traditional optical switches relying on the weak, volatile thermo-optic or electro-optic effects of Si or SiN waveguides show a high consumption and large footprint. In this paper, we reported an electric-driven phase change optical switch consisting of a Si waveguide, Ge 2 Sb 2 Te 5 (GST) thin film and graphene heater suitable for large-scale integration and high-speed switching. The reversible transition between the amorphous and crystalline states was achieved by applying two different voltage pulses of 1.4 V (SET) and 4 V (RESET). The optical performance of the proposed switch showed a high extinction ration of 44-46 dB in a wide spectral range (1525-1575 nm), an effective index variation of Δn eff =0.49 and a mode loss variation of Δα=15 dB μm −1 at the wavelength of 1550 nm. In thermal simulations, thanks to the ultrahigh thermal conductivity of graphene, the proposed switch showed that the consumption for the SET process was only 3.528 pJ with a 1.4 V pulse of 5 ns, while a 4 V pulse of 1.5 ns was needed for RESET process with a consumption of 1.05 nJ. Our work is helpful to analyze the thermalconduction phase transition process of on-chip phase change optical switches, and the design of the low-energy-consumption switch is conducive to the integrated application of photonic chips.

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Section: Mode Analysissupporting

confidence: 86%

Design of an electric-driven nonvolatile low-energy-consumption phase change optical switch

Liu

Han

et al. 2021

Nanotechnology

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“…There are two crystalline states of GST, namely cubic and hexagonal phases. Generally, these two phases can be obtained via heat treatment according to the different crystalline temperatures of ∼170 • C (cubic) and ∼300 • C (hexagonal) [29]. But for the laser induced phase transition, only a cubic structure was obtained, owing to a fast phase transition as reported in previous study [30].…”

Section: Sample Design and Fabricationmentioning

confidence: 75%

Enhancing the adjustable range of saturation in color reflectors using a phase-change material as an effective absorption base

Chen¹,

Liu²,

Zhang³

et al. 2022

J. Phys. D: Appl. Phys.

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Structural color technology has garnered extensive attention in the development of ink-free color technology for applications such as color displays, color reflectors, and colorimetric devices. A Fabry–Perot (F–P) structure formed by stacking a metal base, an interference cavity, and a phase change material layer (MIP) is of significant interest as a lithography-free and scalable color-reflecting structure. Such a structure can selectively reflect interfered light over a range of visible wavelengths, resulting in bright colors. However, obtaining a wide range of saturation regulation spaces has become a challenge. In this study, an F–P color reflector based on a phase-change material (PCM) base is proposed, which consists of a PCM base, an interference layer, and a PCM top layer (PIP). The results of the finite element simulation and experimental measurements demonstrated that the PIP reflector had an adjustable saturation range 10.75 times larger than that of the MIP reflector. The effects of the structure size and phase change of the PCM layer on the structural characteristics were further analyzed. In addition, the performance of laser-induced color change and its application in color printing were demonstrated. The present study sheds new light on color reflectors, and the strategy proposed indicates their potential optoelectronic applications based on saturation modulation.

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Nanostructured Materials and Architectures for Advanced Optoelectronic Synaptic Devices

Ilyas

Wang

et al. 2021

Adv Funct Materials

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Neuromorphic photonics system based on the principle of biological brain is emerging as one of the potential solutions to the bottleneck inherent in classical von Neumann computing system. Optoelectronic synaptic devices, used to mimic the visual function of bio-synapse by adapting synaptic weights, can construct a highly efficient brain-inspired computing system, in which the nanostructured materials and device architectures are attracting extensive interests, giving many potential benefits in confined light-matter interaction, fast carrier dynamics, and photocarriers trapping. Moreover, the conjunction of traditional nanostructured photodetectors and newly realized electronic synapses also exhibit appealing performance for many practical applications including information processing and computing. This review focuses and summarizes on recent achievement in developing advanced optoelectronic synaptic devices based on nanostructured materials as 0D (quantum dots), 1D, and 2D materials, as well as, the rapidly evolving hybrid heterostructures. In addition, challenges and promising prospects in this research field are also discussed.

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Design of low loss 1 × 1 and 1 × 2 phase-change optical switches with different crystalline phases of Ge₂Sb₂Te₅ films

Cited by 5 publications

References 46 publications

Design of an electric-driven nonvolatile low-energy-consumption phase change optical switch

Design of an electric-driven nonvolatile low-energy-consumption phase change optical switch

Enhancing the adjustable range of saturation in color reflectors using a phase-change material as an effective absorption base

Nanostructured Materials and Architectures for Advanced Optoelectronic Synaptic Devices

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