Author Affiliations
Abstract
1 China University of Mining and Technology, School of Materials and Physics, Xuzhou, China
2 Southeast University, State Key Laboratory of Millimeter Waves, Nanjing, China
3 Soochow University, School of Physical Science and Technology and Collaborative Innovation Center of Suzhou Nano Science and Technology, Suzhou, China
4 Soochow University, Institute for Advanced Study, Suzhou, China
The pseudo-magnetic field, an artificial synthetic gauge field, has attracted intense research interest in the classical wave system. The strong pseudo-magnetic field is realized in a two-dimensional photonic crystal (PhC) by introducing the uniaxial linear gradient deformation. The emergence of the pseudo-magnetic field leads to the quantization of Landau levels. The quantum-Hall-like edge states between adjacent Landau levels are observed in our designed experimental implementation. The combination of two reversed gradient PhCs gives rise to the spatially nonuniform pseudo-magnetic field. The propagation of the large-area edge state and the interesting phenomenon of the snake state induced by the nonuniform pseudo-magnetic field is experimentally demonstrated in a PhC heterostructure. This provides a good platform to manipulate the transport of electromagnetic waves and to design useful devices for information processing.
photonic crystal pseudo-magnetic field edge state snake state Advanced Photonics Nexus
2024, 3(2): 026011
Author Affiliations
Abstract
1 School of Science, Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Jiangnan University, Wuxi 214122, China
2 School of Materials Science and Physics, China University of Mining and Technology, Xuzhou 221116, China
3 School of Physical Science and Technology, Guangxi Normal University, Guilin 541004, China
4 State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China
5 e-mail: yangyt@cumt.edu.cn
6 e-mail: jcwang@jiangnan.edu.cn
Topological edge states have an important role in optical modulation with potential applications in wavelength division multiplexers (WDMs). In this paper, 2D photonic crystals (PCs) with different rotation angles are combined to generate topological edge states. We reveal the relationship between the edge states and the rotation parameters of PCs, and further propose a WDM to realize the application of adjustable beams. Our findings successfully reveal the channel selectivity for optical transmission and provide a flexible way to promote the development of topological photonic devices.
Photonics Research
2023, 11(4): 569
基于多个圆环嵌套结构单元, 设计、加工与测试了一种对偏振无依赖以及大角度入射稳定的三波段超材料宽带带通滤波器(BPF)。仿真结果表明该滤波器存在三个通带, 中心频率分别为7.22, 10.10, 14.46 GHz, 3 dB相对带宽分别为17.5%, 20.2%和17.4%, 中心频率处透射率分别为-0.85 dB, -0.69 dB和-1.73 dB。单元结构具有旋转对称性, 使得该滤波器对电磁波偏振不敏感, 并且在入射角达到40°时, 三个波段依然维持较好的稳定性。通过监测谐振频点处的表面电流分布情况, 分析了三波段滤波的物理机理。这种带通滤波器具有多波段滤波、偏振无依赖以及大角度入射稳定等特性, 有望在多频谱成像技术、信息通信等领域发挥一定的作用。
光学器件 带通滤波器 超材料 三波段
Author Affiliations
Abstract
1 Department of Physics, China University of Mining and Technology, Xuzhou 221008
2 State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050
3 School of Physics and telecommunication, Wenzhou University, Wenzhou 325035
We project a compact T-branch beam splitter with a micron scale using a two-dimensional (2D) photonic crystal (PC). For TE polarization, one light beam can be split into two sub-beams along opposite directions. The propagating directions of the two splitting beams remain unchanged when the incident angle varies in a certain range. Coupled-mode theory is used to analyze the truncating interface structure in order to investigate the energy loss of the splitter. Simulation results and theoretical analysis show that choosing an appropriate location of the truncating interface (PC-air interface) is very important for obtaining high efficiency due to the effect of defect modes. The most advantage of this kind of beam splitter is being fabricated and integrated easily.
光子晶体 自准直 反常反射 分束器 耦合模理论 230.1360 Beam splitters 120.1680 Collimation Chinese Optics Letters
2008, 6(10): 709
Author Affiliations
Abstract
Department of Physics, School of Sciences, China University of Mining and Technology, Xuzhou 221008
Polarization independent bends and beam splitters for transverse electric (TE) and transverse magnetic (TM) polarizations have been demonstrated in two-dimensional (2D) photonic crystals (PhCs). In virtuel of equi-frequency contour analysis and finite-difference time-domain calculations, self-collimation behaviors for TE- and TM-polarizations are achieved at the same frequency. Simulation results show a 90-degree bend with 90% efficiency and beam splitters with about 96% total efficiency for both TE- and TM-polarizations, where the light is self-guided by the self-collimation effect. Such bends and beam splitters are expected to play important roles in optical devices where polarization insensitivity is needed.
光子晶体 自准直 光折弯 分束器 250.5300 Photonic integrated circuits 120.1680 Collimation 230.1360 Beam splitters Chinese Optics Letters
2007, 5(11): 662
