115學年材料系-第一週 專題研討課程 演講公告 (115年3月5日)

This presentation explores the use of liquid metals, specifically Gallium and its alloys, as innovative platforms for synthesizing two-dimensional (2D) functional materials. The research highlights two primary synthesis techniques: printing technology and gas injection. Using the printing method, the team synthesizes 2D Ga₂O₃, which can be thermally converted into crystalline beta-Ga₂O₃ or GaN. These materials offer tunable bandgaps, ideal for photodetectors, that balance high sensitivity with rapid switching speeds. The gas injection platform uses a Gallium-Chromium alloy in a 0.2 M HCl solution to produce Cr₂O₃ and CrN nanosheets. These Cr-based materials exhibit sharply contrasting thermal properties: P-type Cr₂O₃ is highly sensitive for thermal sensing, whereas N-type CrN is highly stable for conductive applications. The talk concludes with future directions for scalable TeO₂ printing technologies.

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115學年材料系-第一週 (二) 專題研討課程 演講公告 (115年3月5日)

題目：以生物光子結構為平台:界定均質化理論的物理極限
講者：國立中山大學材光系 - 張尹 助理教授
現職：國立中山大學材光系助理教授
時間：3/5 (四) 15:20~17:10
地點:成功大學 成功校區 三系館 鋼構區 (3F) 共同教室 A1302 演講廳 

內容摘要:

Nature’s structural ingenuity has long inspired science and engineering, yet the physical principles governing highly heterogeneous biological architectures remain insufficiently understood. Unlike engineered materials designed for uniformity, biological photonic systems exhibit intrinsic structural and compositional heterogeneity at multiple scales within minute volumes. How such organized variability shapes optical functionality, wave transport, and field localization remains an open question.
In this project, I investigate three-dimensional photonic architectures in insects that achieve similar optical outcomes through distinct structural strategies and materials. By integrating small- and wide-angle X-ray scattering (SAXS/WAXS), volumetric FIB/SEM reconstruction, phase-sensitive imaging, and nonlinear optical methods including fluorescence lifetime imaging microscopy (FLIM), I quantify variance, correlation length, and molecular distribution across hierarchical scales.
This materials-driven approach reveals how heterogeneity modulates collective optical behavior beyond classical homogenization models. Leveraging Taiwan’s exceptional biodiversity and comparative structural diversity, the project systematically maps fluctuation-controlled regimes. Ultimately, it establishes heterogeneity as a tunable design variable for advanced photonic, nonlinear, and bio-inspired functional materials.

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