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arXiv 2101.11468physics.optics
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从弱耦合到超强耦合的微腔声子极化激元

Microcavity phonon polaritons from weak to ultrastrong phonon-photon coupling

Maria Barra-Burillo, Unai Muniain, Sara Catalano, Marta Autore, Felix Casanova, Luis E. Hueso, Javier Aizpurua, Ruben Esteban, Rainer Hillenbrand

摘要:

分子振动和微腔模式之间的强耦合已经被证明可以改变分子材料的物理和化学性质。在这里,我们研究了较少探索晶格振动(声子)和微腔模式之间的耦合。嵌入到经典的微腔的六方氮化硼(hBN)的薄层,我们证明了从弱到超强的声子-光子耦合时,hBN的厚度从几个纳米增加到一个完全充满腔的演变。值得注意的是,对于薄至10 nm的hBN层实现了强耦合。此外,在完全填充的腔中的超强耦合产生与体hBN中的声子极化激元的腔极化激元色散相匹配的腔极化激元色散,突出了微腔中的最大光-物质耦合限于光子和体材料之间的耦合强度。可调谐腔声子极化激元可以成为研究光子和声子之间的耦合强度如何改变极性晶体性质的通用平台。

英文摘要:

Strong coupling between molecular vibrations and microcavity modes has been demonstrated to modify physical and chemical properties of the molecular material. Here, we study the much less explored coupling between lattice vibrations (phonons) and microcavity modes. Embedding thin layers of hexagonal boron nitride (hBN) into classical microcavities, we demonstrate the evolution from weak to ultrastrong phonon-photon coupling when the hBN thickness is increased from a few nanometers to a fully filled cavity. Remarkably, strong coupling is achieved for hBN layers as thin as 10 nm. Further, the ultrastrong coupling in fully filled cavities yields a cavity polariton dispersion matching that of phonon polaritons in bulk hBN, highlighting that the maximum light-matter coupling in microcavities is limited to the coupling strength between photons and the bulk material. The tunable cavity phonon polaritons could become a versatile platform for studying how the coupling strength between photons and phonons may modify the properties of polar crystals.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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