Bapat Aneesh, Dixit Saurabh, Gupta Yashika, Low Tony, Kumar Anshuman
Laboratory of Optics of Quantum Materials, Physics Department, IIT Bombay, Mumbai 400076, India.
Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, MN 55455, USA.
Nanophotonics. 2022 Apr 4;11(10):2329-2340. doi: 10.1515/nanoph-2022-0034. eCollection 2022 May.
The recent discovery of natural biaxial hyperbolicity in van der Waals crystals, such as -MoO, has opened up new avenues for mid-IR nanophotonics due to their deep subwavelength phonon polaritons. However, a significant challenge is the lack of active tunability of these hyperbolic phonon polaritons. In this work, we investigate heterostructures of graphene and -MoO for actively tunable hybrid plasmon phonon polariton modes via electrostatic gating in the mid-infrared spectral region. We observe a unique propagation direction dependent hybridization of graphene plasmon polaritons with hyperbolic phonon polaritons for experimentally feasible values of graphene chemical potential. We further report an application to tunable valley quantum interference in this system with a broad operational bandwidth due to the formation of these hybrid modes. This work presents a lithography-free alternative for actively tunable, anisotropic spontaneous emission enhancement using a sub-wavelength thick naturally biaxial hyperbolic material.
最近在诸如 -MoO 等范德华晶体中发现的天然双轴双曲线性，由于其深亚波长声子极化激元，为中红外纳米光子学开辟了新途径。然而，一个重大挑战是这些双曲线性声子极化激元缺乏主动可调性。在这项工作中，我们研究了石墨烯和 -MoO 的异质结构，以通过中红外光谱区域中的静电门控实现主动可调谐的混合等离激元声子极化激元模式。对于石墨烯化学势的实验可行值，我们观察到石墨烯等离激元极化激元与双曲线性声子极化激元的独特传播方向依赖性杂化。由于这些混合模式的形成，我们进一步报道了该系统在具有宽操作带宽的可调谐谷量子干涉中的应用。这项工作提出了一种无需光刻的替代方案，用于使用亚波长厚的天然双轴双曲线性材料实现主动可调谐、各向异性的自发发射增强。
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