THz-frequency magnon-phonon-polaritons in the collective strong-coupling regime
THz-frequency magnon-phonon-polaritons in the collective strong-coupling regime
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DOI：
10.1063/1.5083849
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发表时间：
2019-06-07
影响因子：
3.2
通讯作者：
Nelson, Keith A.
中科院分区：
文献类型：
--
作者：
Sivarajah, Prasahnt;Steinbacher, Andreas;Nelson, Keith A.
光与物质之间的强耦合发生在两者相互作用时，从而形成新的混合模式，即所谓的极化激元。在这里，我们报告的电和磁自由度的强耦合到超快太赫兹（THz）频率的电磁波。在我们的系统中，光学声子在铁电锂铁酸盐板强烈耦合到太赫兹电场，形成声子极化激元，同时强烈耦合到相邻的斜反铁磁铒正铁氧体板通过磁场分量相同的太赫兹脉冲的磁振子。我们并列的实验结果的裸板组成的两种材料的光子晶体腔，由一个二维阵列的空气孔切割成的混合板。在这两种情况下，强耦合导致形成新的磁振子声子极化激元模式，我们在实验中观察到在时域中作为正常模式拍频，并在频域中对应于避免交叉。我们简单而多功能的波导平台提供了一个有前途的途径，通过它来探索超快太赫兹自旋电子学，量子电动力学，传感和光谱应用。
Strong coupling between light and matter occurs when the two interact such that new hybrid modes, the so-called polaritons, are formed. Here, we report on the strong coupling of both the electric and the magnetic degrees of freedom to an ultrafast terahertz (THz) frequency electromagnetic wave. In our system, optical phonons in a slab of ferroelectric lithium niobate are strongly coupled to a THz electric field to form phonon-polaritons, which are simultaneously strongly coupled to magnons in an adjacent slab of canted antiferromagnetic erbium orthoferrite via the magnetic-field component of the same THz pulse. We juxtapose experimental results of bare slabs consisting of the two materials with a photonic crystal cavity, consisting of a two-dimensional array of air holes cut into the hybrid slab. In both cases, the strong coupling leads to the formation of new magnon-phonon-polariton modes, which we experimentally observe in the time domain as a normal-mode beating and which corresponds in the frequency domain to an avoided crossing. Our simple yet versatile waveguide platform provides a promising avenue through which to explore ultrafast THz spintronics, quantum electrodynamics, sensing, and spectroscopic applications.