Enhanced near-field coupling and tunable topological transitions in hyperbolic van der Waals metasurfaces for optical nanomanipulation

Wang, Xueli; Chang, Kaili; Liu, Weitao; Wang, Hongqin; Chen, Junying; Liu, Kaihui; Chen, Jianing; Chen, Ke

doi:10.1039/d1nr08490a

Cited by 4 publications

(2 citation statements)

References 36 publications

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“…In addition, the PiFM instrument shows the ability to real-space nanoimaging polaritonic modes in vdW materials, providing an alternative tool besides monochromatic s-SNOM to investigate novel polaritonic phenomena at the low frequency region, especially for below 880 cm −1 . Our work offers a convenient and robust method to effectively manipulate the canalization of PhPs in a natural vdW materials and metamaterials [45][46][47] , prompting the potentials applications in nanoimaging, subwavelength directional energy transfer and enhanced nonlinearity at the deep nanoscale 48-50 .…”

Section: Discussionmentioning

confidence: 99%

Observation of canalized phonon polaritons in a single-layer α-MoO3 flake

Wang,

Long

et al. 2024

Preprint

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The canalization effect of phonon polaritons (PhPs) shows highly directional, and diffraction-less propagation characteristics in van der Waals (vdW) materials, offering new opportunities to mold the light flow at nanoscale for near-field energy, information and thermal managements. Previously, canalized PhPs have only been experimentally realized in the hexagonal boron nitride metasurface, heterostructures of twisted α-phase molybdenum trioxide (α-MoO3) crystal flakes or the hybridized system. However, these systems typically have complex structures, and require strict operational conditions, such as fine structural parameters, a specific photonic magic angle or a doping level of graphene, for realizing polariton canalization with a modest performance. Here, we demonstrate the high-quality PhPs canalization in a single-layer natural α-MoO3 crystal flake. The canalized PhPs exhibit the highly directional, and diffraction-free propagation features, associated with lateral confinement ratio up to λ0/80 (where λ0 is the free-space wavelength of the incident laser). We believe this work is important to effectively manipulate PhPs in natural vdW materials, with potential applications in nanoimaging, directional energy transfer and enhanced nonlinearity at the deep subwavelength scale.

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Section: Discussionmentioning

confidence: 99%

Observation of canalized phonon polaritons in a single-layer α-MoO3 flake

Wang,

Long

et al. 2024

Preprint

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“…Compared with the closed IFS of general media, the hyperbolic dispersion theoretically allows for an endlessly large wave vector accompanied by a greatly increased photonic density of states. [12][13][14] The enhanced lightmatter interaction has significant consequences for strong augmentation of spontaneous emission and Cherenkov emission with low energy electrons. [15][16][17][18] Moreover, the evanescent waves with large wave vectors in general materials would be converted into propagating waves that propagate without attenuation in this strongly anisotropic medium.…”

Section: Introductionmentioning

confidence: 99%