Du Shihao, Zhang Wenjie, Liu Wenzhe, Zhang Yanbin, Zhao Maoxiong, Shi Lei
State Key Laboratory of Surface Physics, Key Laboratory of Micro- and Nano-Photonic Structures (Ministry of Education) and Department of Physics, Fudan University, Shanghai 200433, China.
Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.
Nanophotonics. 2022 Sep 19;11(20):4531-4536. doi: 10.1515/nanoph-2022-0387. eCollection 2022 Sep.
In this letter, we demonstrate the existence of large transmitted optical positive and negative Goos-Hänchen shifts in photonic crystal slabs numerically and experimentally. The Goos-Hänchen shift we observed directly reaches ∼20 μm, which is 30 times the wavelength, approaching the radius of the beam waist. To explain this phenomenon, we measure the transmission phase through the phase measurement system and find there is an acute phase change near the resonance in photonic crystal slabs, which enhances the Goos-Hänchen shift. Our experimental results are consistent with simulation, and the work can be used to modulate the propagation of light in further research.
在这封信中，我们通过数值模拟和实验证明了光子晶体平板中存在大的透射光学正负古斯-汉欣位移。我们直接观测到的古斯-汉欣位移达到了约20μm，这是波长的30倍，接近束腰半径。为了解释这一现象，我们通过相位测量系统测量了透射相位，发现在光子晶体平板的共振附近存在急剧的相位变化，这增强了古斯-汉欣位移。我们的实验结果与模拟结果一致，这项工作可用于在进一步的研究中调制光的传播。
