纤锌矿型氮化铝Reststrahlen带中的和频产生光谱显微术
Sum-Frequency Generation Spectro-Microscopy in the Reststrahlen Band of Wurtzite-type Aluminum Nitride
AI总结：
本研究结合非线性光学成像与SFG光谱学优势，利用红外自由电子激光实现SFG光谱显微，以纤锌矿型氮化铝验证可行性，实验与理论吻合，有望为铁性材料等非均匀体系提供空间分辨光谱信息。
摘要：
非线性光学显微术与光谱学可提供精细的空间与光谱对比度，对结构对称性和有序性具有特异性灵敏度。尤其是铁性材料，已通过二次谐波产生成像得到广泛研究，该方法能提供畴结构的详细信息，但通常缺乏光谱细节。相比之下，红外-可见和频产生（SFG）光谱学通过振动共振揭示原子结构与键合的细节，但传统上缺乏空间信息。在本研究中，我们利用红外自由电子激光开展SFG光谱显微，结合了非线性光学成像与SFG光谱学的优势。具体而言，我们以面内各向异性的纤锌矿型氮化铝为模型体系，验证了SFG光谱显微用于光谱检测的可行性。我们发现实验光谱与理论计算吻合良好，并展示了该显微镜未来可在铁性材料及其畴等非均匀体系中提供空间分辨光谱信息的潜力。
英文摘要：
Nonlinear-optical microscopy and spectroscopy provide detailed spatial and spectroscopic contrast, specifically sensitive to structural symmetry and order. Ferroics, in particular, have been widely studied using second harmonic generation imaging, which provides detailed information on domain structures but typically lacks spectroscopic detail. In contrast, infrared-visible sum-frequency generation (SFG) spectroscopy reveals details of the atomic structure and bonding via vibrational resonances, but conventionally lacks spatial information. In this work, we combine the benefits of nonlinear optical imaging and SFG spectroscopy by employing SFG spectro-microscopy using an infrared free-electron laser. Specifically, we demonstrate the feasibility of SFG spectro-microscopy for spectroscopy using in-plane anisotropic wurtzite-type aluminum nitride as a model system. We find the experimental spectra to agree well with our theoretical calculations and we show the potential of our microscope to provide spatially resolved spectroscopic information in inhomogeneous systems such as ferroics and their domains in the near future.
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