Low-power all-optical photonic crystal synapse using Ge2Sb2Te5 phase-change material

IF 3 Q3 Physics and Astronomy
Amir Hossein Abdollahi Nohoji, Parviz Keshavarzi, Mohammad Danaie
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引用次数: 0

Abstract

In this study, we propose an all-optical neuromorphic photonic crystal synapse structure equipped with a Ge2Sb2Te5 phase-change material (GST-PCM). By leveraging the unique properties of the GST-PCM material, this structure enables the control of the synaptic weight through targeted and focused laser irradiation. 3D simulations employing the finite-difference time-domain (FDTD) and finite element method (FEM) demonstrated optical transmission exceeding 99 % and reflection below −20 dB at a wavelength of 1504 nm within the proposed structure. These features, together with their compact dimensions and low power consumption, make our proposed structure an ideal candidate for optical processing applications and neuromorphic neural networks. Furthermore, we investigated the physical and thermal equations to determine the crystallization fraction of GST-PCM during the synapse weighting process. These equations showed excellent agreement with the simulation results and could accurately calculate the GST-PCM crystallization fraction as a function of time and laser power. Our proposed structure not only has the potential to be extended to neuromorphic systems and optical neural networks but also serves as an innovative platform for all-optical synapses because of its precise control of optical properties, high adaptability, and low power consumption.
采用Ge2Sb2Te5相变材料制备的低功耗全光光子晶体突触
在这项研究中,我们提出了一种配备Ge2Sb2Te5相变材料(GST-PCM)的全光神经形态光子晶体突触结构。通过利用GST-PCM材料的独特特性,这种结构可以通过靶向和聚焦激光照射来控制突触重量。采用时域有限差分法(FDTD)和有限元法(FEM)的三维仿真表明,在所提出的结构中,在波长1504 nm处,光透射率超过99%,反射率低于- 20 dB。这些特点,加上它们紧凑的尺寸和低功耗,使我们提出的结构成为光学处理应用和神经形态神经网络的理想候选者。此外,我们研究了物理和热方程,以确定突触称重过程中GST-PCM的结晶分数。这些方程与模拟结果吻合良好,能够准确地计算出GST-PCM结晶率随时间和激光功率的变化规律。我们提出的结构不仅具有扩展到神经形态系统和光神经网络的潜力,而且由于其精确控制光学特性,高适应性和低功耗,还可以作为全光突触的创新平台。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Results in Optics
Results in Optics Physics and Astronomy-Atomic and Molecular Physics, and Optics
CiteScore
2.50
自引率
0.00%
发文量
115
审稿时长
71 days
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