Van der Waals Phonon Polariton Microstructures for Configurable Infrared Electromagnetic Field Localizations

  title={Van der Waals Phonon Polariton Microstructures for Configurable Infrared Electromagnetic Field Localizations},
  author={Wuchao Huang and Fengsheng Sun and Zebo Zheng and Thomas G. Folland and Xuexian Chen and Huizhen Liao and Ningsheng Xu and Joshua D. Caldwell and Huanjun Chen and Shaozhi Deng},
  journal={Advanced Science},
Polar van der Waals (vdW) crystals that support phonon polaritons have recently attracted much attention because they can confine infrared and terahertz (THz) light to deeply subwavelength dimensions, allowing for the guiding and manipulation of light at the nanoscale. The practical applications of these crystals in devices rely strongly on deterministic engineering of their spatially localized electromagnetic field distributions, which has remained challenging. The polariton interference can… 

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Phonon polaritons in twisted double-layers of hyperbolic van der Waals crystals.

A lithography-free approach for manipulating thehyperbolicity by harnessing the twist-dependent coupling of phonon polaritons in double-layers of vdW α-MoO3, a naturally biaxial hyperbolic crystal is demonstrated.

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An analytical waveguide model to describe polariton propagations in vdW crystals and provides an analytical rationale for describing and understanding the localized electromagnetic fields in vDW crystals that are associated with polaritons.

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A new degree of freedom (twist angle) for controlling the propagation of polaritons at the nanoscale with potential for nano-imaging, (bio)-sensing, quantum applications and heat management is demonstrated.

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The tailoring of electromagnetic field localizations in the mid-infrared region is demonstrated by precisely shaping graphene into nanostructures with different geometries, providing new degrees of freedom for designing nanophotonic components capable of tailoring two-dimensional light confinement over a broad wavelength range.

Edge-oriented and steerable hyperbolic polaritons in anisotropic van der Waals nanocavities

Highly confined and low-loss polaritons are known to propagate isotropically over graphene and hexagonal boron nitride in the plane, leaving limited degrees of freedom in manipulating light at the