Dataset Information

Conformal CVD-Grown MoS₂ on Three-Dimensional Woodpile Photonic Crystals for Photonic Bandgap Engineering.

ABSTRACT: To achieve the modification of photonic band structures and realize the dispersion control toward functional photonic devices, composites of photonic crystal templates with high-refractive-index material are fabricated. A two-step process is used: 3D polymeric woodpile templates are fabricated by a direct laser writing method followed by chemical vapor deposition of MoS₂. We observed red-shifts of partial bandgaps at the near-infrared region when the thickness of deposited MoS₂ films increases. A ∼10 nm red-shift of fundamental and high-order bandgap is measured after each 1 nm MoS₂ thin film deposition and confirmed by simulations and optical measurements using an angle-resolved Fourier imaging spectroscopy system.

SUBMITTER: Taverne MPC

PROVIDER: S-EPMC10226160 | biostudies-literature | 2023 May

REPOSITORIES: biostudies-literature

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Publications

Conformal CVD-Grown MoS2 on Three-Dimensional Woodpile Photonic Crystals for Photonic Bandgap Engineering.

Taverne Mike P C MPC Zheng Xu X Chen Yu-Shao Jacky YJ Morgan Katrina A KA Chen Lifeng L Palakkool Nadira Meethale NM Rezaie Daniel D Awachi Habib H Rarity John G JG Hewak Daniel W DW Huang Chung-Che CC Ho Ying-Lung Daniel YD

ACS applied optical materials 20230510 5

To achieve the modification of photonic band structures and realize the dispersion control toward functional photonic devices, composites of photonic crystal templates with high-refractive-index material are fabricated. A two-step process is used: 3D polymeric woodpile templates are fabricated by a direct laser writing method followed by chemical vapor deposition of MoS2. We observed red-shifts of partial bandgaps at the near-infrared region when the thickness of deposited MoS2</ ...[more]

PMID: 37255502

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Project description:BackgroundIn Complementary Metal-Oxide Semiconductor (CMOS) technology, scaling down has been a key strategy to improve chip performance and reduce power losses. However, challenges such as sub-threshold leakage and gate leakage, resulting from short-channel effects, contribute to an increase in distributed static power. Two-dimensional transition metal dichalcogenides (2D TMDs) emerge as potential solutions, serving as channel materials with steep sub-threshold swings and lower power consumption. However, the production and development of these 2-dimensional materials require some time-consuming tasks. In order to employ them in different fields, including chip technology, it is crucial to ensure that their production meets the required standards of quality and uniformity; in this context, deep learning techniques show significant potential.MethodsThis research introduces a transfer learning-based deep convolutional neural network (CNN) to classify chemical vapor deposition (CVD) grown molybdenum disulfide (MoS2) flakes based on their uniformity or the occurrence of defects affecting electronic properties. Acquiring and labeling a sufficient number of microscope images for CNN training may not be realistic. To address this challenge, artificial images were generated using Fresnel equations to pre-train the CNN. Subsequently, accuracy was improved through fine-tuning with a limited set of real images.ResultsThe proposed transfer learning-based CNN method significantly improved all measurement metrics with respect to the ordinary CNNs. The initial CNN, trained with limited data and without transfer learning, achieved 68% average accuracy for binary classification. Through transfer learning and artificial images, the same CNN achieved 85% average accuracy, demonstrating an average increase of approximately 17%. While this study specifically focuses on MoS2 structures, the same methodology can be extended to other 2-dimensional materials by simply incorporating their specific parameters when generating artificial images.

Dataset Information

Conformal CVD-Grown MoS₂ on Three-Dimensional Woodpile Photonic Crystals for Photonic Bandgap Engineering.

Publications

Conformal CVD-Grown MoS<sub>2</sub> on Three-Dimensional Woodpile Photonic Crystals for Photonic Bandgap Engineering.

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