Hyperbolic polaritonic crystals with configurable low-symmetry Bloch modes

被引：0
作者：
Jiangtao Lv
Yingjie Wu
Jingying Liu
Youning Gong
Guangyuan Si
Guangwei Hu
Qing Zhang
Yupeng Zhang
Jian-Xin Tang
Michael S. Fuhrer
Hongsheng Chen
Stefan A. Maier
Cheng-Wei Qiu
Qingdong Ou
机构：
[1] Northeastern University,College of Information Science and Engineering
[2] Northeastern University at Qinhuangdao,School of Control Engineering, Hebei Key Laboratory of Micro
[3] Zhejiang University,Nano Precision Optical Sensing and Measurement Technology
[4] Macau University of Science and Technology,ZJU
[5] Monash University,Hangzhou Global Scientific and Technological Innovation Center
[6] Shenzhen University,Macao Institute of Materials Science and Engineering (MIMSE), Faculty of Innovation Engineering
[7] Victorian Node of the Australian National Fabrication Facility,Department of Materials Science and Engineering
[8] Nanyang Technological University,State Key Laboratory of Radio Frequency Heterogeneous Integration, College of Electronics and Information Engineering
[9] University of Electronic Science and Technology of China,Melbourne Centre for Nanofabrication
[10] Soochow University,School of Electrical and Electronic Engineering
[11] Monash University,School of Physics
[12] Monash University,Jiangsu Key Laboratory for Carbon
[13] Imperial College London,Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM)
[14] National University of Singapore,ARC Centre of Excellence in Future Low
来源：
Nature Communications | / 14卷
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摘要：
Photonic crystals (PhCs) are a kind of artificial structures that can mold the flow of light at will. Polaritonic crystals (PoCs) made from polaritonic media offer a promising route to controlling nano-light at the subwavelength scale. Conventional bulk PhCs and recent van der Waals PoCs mainly show highly symmetric excitation of Bloch modes that closely rely on lattice orders. Here, we experimentally demonstrate a type of hyperbolic PoCs with configurable and low-symmetry deep-subwavelength Bloch modes that are robust against lattice rearrangement in certain directions. This is achieved by periodically perforating a natural crystal α-MoO3 that hosts in-plane hyperbolic phonon polaritons. The mode excitation and symmetry are controlled by the momentum matching between reciprocal lattice vectors and hyperbolic dispersions. We show that the Bloch modes and Bragg resonances of hyperbolic PoCs can be tuned through lattice scales and orientations while exhibiting robust properties immune to lattice rearrangement in the hyperbolic forbidden directions. Our findings provide insights into the physics of hyperbolic PoCs and expand the categories of PhCs, with potential applications in waveguiding, energy transfer, biosensing and quantum nano-optics.
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