Dr. Bin Ai Profile

Dr. Bin Ai

at Chongqing Univ

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Publications (2)

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Proceedings Article | 28 November 2023 Poster + Paper

Plasmonic hydrogen sensor based on Pd-Ag synergistic multilayer composite film array

Mingyu Cheng, Bin Ai

Proceedings Volume 12773, 1277319 (2023) https://doi.org/10.1117/12.2687513

KEYWORDS: Hydrogen, Multilayers, Plasmonics, Sensors, Detector arrays, Metals, Hydrogen energy, Monolayers, Finite-difference time-domain method, Electric fields

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Hydrogen has become as a significant energy source. Nonetheless, its threat of explosion poses a challenge to the production and use of hydrogen. This study employs electron beam evaporation technology to produce the Ag-Pd multilayer composite plasmonic hydrogen sensors (PHS), which fulfills the requirement for hydrogen safety detection. The sensing characteristics of monolayer, double-layer and multilayer metal film arrays are systematically compared. The excited local surface plasmon resonance (LSPR) on the multilayer composite films enhance the signal intensity effectively. At the same time, the hot spots area excited by the electric field provide energy for hydrogen adsorption, which synergically promotes the fast response of hydrogen. The PHS based on the Ag-Pd multilayer composite films array has the advantages of fast response, high sensitivity and low detection limit. The multilayer composite plasmonic hydrogen sensing platform developed provides an important theoretical basis and technical support for the development of high-performance hydrogen sensors.

Proceedings Article | 28 November 2023 Poster + Paper

Chiroptical properties in rotated nanohole arrays

Xinyi Chen, Bin Ai

Proceedings Volume 12773, 1277317 (2023) https://doi.org/10.1117/12.2687385

KEYWORDS: Materials properties, Sodium, Nanostructures, Simulations, Silver, Plasmonics, Molecules, Molecular interactions, Gold, Finite-difference time-domain method, Chiral materials, Nanopores

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Chiral nanohole arrays (NAs) are of significant research interest for their label-free enantiodiscrimination of biomolecules and drug compounds, even at the picogram level. This study systematically explored the impact of various parameters on chiral optical responses of NAs, enhancing our understanding of underlying mechanisms and optimization strategies. We designed dual-layer nanohole arrays with 3600 elements each, alternating Ag and Au layers. We manipulated incident angles (Δθ, θ₁) and azimuthal angles (Δφ, φ₁) using shadow sphere lithography (SSL) and introduced SiO₂ between the Au and Ag layers to enhance the response. MATLAB generated the NAs, subsequently simulated using the finite-difference time-domain (FDTD) program. Findings revealed central symmetry in circular dichroism (CD) value changes concerning Δθ and Δφ, with a more pronounced effect than variations in θ₁ and φ₁. The inclusion of SiO₂ led to a notable 118% increase in the maximum |CD|_max value, reaching 6.50° for the 100 nm sandwiched NA (SNA150) with a radius of r = 150 nm. The maximum |g-factor| of the Ag-Au SNA150 increased with the r. An efficient model categorized NAs with similar CD responses, reducing simulations to 498 based on mirror, symmetry and a 60° differential rotation property. This research provides a valuable resource for future machine learning analyses and predictions across diverse structural configurations, significantly advancing applications such as the detection of weak chiral optical molecules or proteins, compact polarization converters, and label-free chiral sensors, fostering innovation in nanohole array technology, particularly in biomedicine and optoelectronics.

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