傅里叶变换角分辨反射光谱研究InP基光子晶体中红外色散关系
Mid-infrared dispersion relations in InP based photonic crystal slabs revealed by Fourier-transform angle-resolved reflection spectroscopy
摘要：
光子晶体（PC）提供了控制光与物质相互作用的独特方法。如果我们要在PC设备中创建新的功能，色散关系的测量是一个基本的先决条件。角分辨光谱技术通常用于表征在可见光和近红外区域工作的PC。然而，由于红外探测器的灵敏度有限，这些技术不能应用于中波长和长波长的红外区域。在这里，我们提出了一种替代方法来测量红外色散关系。我们构建了一个高精度的角度分辨设置兼容的傅里叶变换光谱仪的角度分辨率高达0.3度。因此，反射光谱被映射到二维光子能带结构的In（Ga，Al）As/InP基PC板条，这是设计为中红外PC面发射激光器。我们确定复杂的PC模式的偏振选择规则的帮助下导出的群论。频谱分析使得可以评估模式质量（Q）因子。因此，角分辨反射是优化中红外器件二维光子晶体参数的有效方法。
英文摘要：
Photonic crystals (PCs) offer unique ways to control light-matter interactions. The measurement of dispersion relations is a fundamental prerequisite if we are to create novel functionalities in PC devices. Angle-resolved spectroscopic techniques are commonly used for characterizing PCs that work in the visible and near-infrared regions. However, the techniques cannot be applied to the mid- and long-wavelength infrared regions due to the limited sensitivity of infrared detectors. Here, we propose an alternative approach to measuring infrared dispersion relations. We construct a high-precision angle-resolved setup compatible with a Fourier-transform spectrometer with an angle resolution as high as 0.3 degrees. Hence, the reflection spectra are mapped to the 2D photonic band structures of In(Ga,Al)As/InP based PC slabs, which are designed as mid-infrared PC surface-emitting lasers. We identify complex PC modes with the aid of polarization selection rules derived by the group theory. Spectral analysis makes it possible to evaluate the mode quality (Q) factors. Therefore, angle-resolved reflection is a useful way of optimizing 2D PC parameters for mid-infrared devices.
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