Tang Hongyi, Qi Zhi-Mei
Opt Express. 2025 Jul 14;33(14):29823-29833. doi: 10.1364/OE.566864.
Goos-Hänchen (GH) shift is a combination of displacement and deflection of the reflected beam with respect to the geometric optical reflection path, which is caused by non-ideal plane wave reflection. GH shift is wavelength dependent, especially in photonic and plasmonic resonance structures. However, there are few studies on the dispersion properties of GH shift. In this paper, we proposed a broadband spectral measurement method for GH shifts, which is implemented using a hyperspectral surface plasmon resonance imaging (HSPRi) sensor constructed in our laboratory. The HSPRi sensor has a wide wavelength range of 400 nm to 1000 nm and can provide up to 1456 grayscale images of different wavelengths. By calculating the centroid position of each grayscale image, the SPR-enhanced GH shifts as a function of wavelength are obtained for the sample under study. The simulation and experimental results of the GH shift on the surface of the 50-nm gold film are almost identical, verifying the reliability and accuracy of the proposed method for measuring GH shift dispersion.
古斯-汉欣（GH）位移是反射光束相对于几何光学反射路径的位移和偏折的组合，它由非理想平面波反射引起。GH位移与波长有关，特别是在光子和等离子体共振结构中。然而，关于GH位移色散特性的研究很少。在本文中，我们提出了一种用于GH位移的宽带光谱测量方法，该方法使用我们实验室构建的高光谱表面等离子体共振成像（HSPRi）传感器来实现。HSPRi传感器具有400nm至1000nm的宽波长范围，并且可以提供多达1456幅不同波长的灰度图像。通过计算每个灰度图像的质心位置，得到了所研究样品的SPR增强GH位移随波长的变化关系。在50nm金膜表面的GH位移模拟和实验结果几乎相同，验证了所提出的测量GH位移色散方法的可靠性和准确性。
