Negative refraction in hyperbolic hetero-bicrystals

Sternbach, Aaron; Moore, Samuel L.; Rikhter, Andrey; Zhang, Shuai; Jing, Ran; Shao, Yinming; Kim, B S Y; Xu, Suheng; Liu, S; Edgar, James H.; Rubio, Ángel; Dean, Cory; Hone, James; Fogler, M. M.; Basov, D. N.

doi:10.1126/science.adf1065

Cited by 39 publications

(19 citation statements)

References 45 publications

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“…The near-field intensity distribution of in-plane hyperbolic focusing affected by the polarization is revealed by modulating the relative angle of the NW to the in-plane polarized light, which is of great significance to guide in-plane modulation efforts. Overall, our work provides new possibilities for deeper investigation of light–matter coupling and guidance modes for low-dimensional nanolens, and polarized wave array-type excitation and focusing provide ideas for molecular sensing, light guidance, energy confinement, ,, etc. It also opens the way for the development of planar photonic applications, such as planar nanoswitches and in-plane heat conduction.…”

Section: Discussionmentioning

confidence: 95%

Focusing of Hyperbolic Phonon Polaritons by Bent Metal Nanowires and Their Polarization Dependence

Sun

et al. 2023

ACS Photonics

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Manipulating in-plane hyperbolic phonon polaritons on biaxial van der Waals crystals provides an opportunity for the development of planar photonic devices. Recent studies show that nanometal disks constructed on the surface of hyperbolic media can focus phonon polaritons, which is a remarkable breakthrough in planar photonics. Here, we demonstrate that using bent metal nanowires made by strain engineering not only produces the focusing of hyperbolic phonon polaritons but also introduces a new modulation factor, the polarization of incident light, which shows a clear affection on focusing. In this study, we investigate the operating mechanism and applicability of this nanolens from the perspective of device size, incident light frequency, and polarization, where the effect of polarization is unprecedented for this type of surface engineering. With the support of super-resolution technology, the foci with high confinement are clearly observed and the focal length from 0.7 to 2.01 μm is achieved. Moreover, the angle between the in-plane polarization direction and the axial direction of the nanowires directly affects the intensity of the local field. This approach provides a new idea to control electromagnetic fields in a two-dimensional plane, which is beneficial to further promote the design of planar optical functional devices.

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Section: Discussionmentioning

confidence: 95%

Focusing of Hyperbolic Phonon Polaritons by Bent Metal Nanowires and Their Polarization Dependence

Sun

et al. 2023

ACS Photonics

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“…Recently, effects of interface with one side of heterostructure isotopically purified, are studied. Phenomena like hyperfine isotope effects regulating interlayer electron-phonon coupling in heterostructures 26 and visualizing negative refraction of phonon polaritons 27 are reported. However, in the case of heterogeneous distribution of isotopes, the presence of isotope interfaces in a natural material makes it similar to the “superlattice” case.…”

Section: Introductionmentioning

confidence: 98%

Phonon transition across an isotopic interface

Shi

et al. 2023

Nat Commun

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Isotopic mixtures result in distinct properties of materials such as thermal conductivity and nuclear process. However, the knowledge of isotopic interface remains largely unexplored mainly due to the challenges in atomic-scale isotopic identification. Here, using electron energy-loss spectroscopy in a scanning transmission electron microscope, we reveal momentum-transfer-dependent phonon behavior at the h−10BN/h-11BN isotope heterostructure with sub-unit-cell resolution. We find the phonons’ energy changes gradually across the interface, featuring a wide transition regime. Phonons near the Brillouin zone center have a transition regime of ~3.34 nm, whereas phonons at the Brillouin zone boundary have a transition regime of ~1.66 nm. We propose that the isotope-induced charge effect at the interface accounts for the distinct delocalization behavior. Moreover, the variation of phonon energy between atom layers near the interface depends on both of momentum transfer and mass change. This study provides new insights into the isotopic effects in natural materials.

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“…Infrared near-field nanospectroscopy combines the nanometer spatial resolution of atomic force microscopy with the high information density of optical spectroscopy. Due to its unique capabilities, the technique has continuously been expanding and has been applied to material characterization throughout various fields of engineering, chemistry, geology, and physics. − A major and rapidly growing subfield of near-field nanospectroscopy includes polariton interferometry, which provides direct access to the dispersion of deeply subwavelength-confined polariton modes. − …”

Section: Introductionmentioning

confidence: 99%

Ultrabroadband Terahertz Near-Field Nanospectroscopy with a HgCdTe Detector

Wehmeier,

Liu,

Park

et al. 2023

ACS Photonics

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Negative refraction in hyperbolic hetero-bicrystals

Cited by 39 publications

References 45 publications

Focusing of Hyperbolic Phonon Polaritons by Bent Metal Nanowires and Their Polarization Dependence

Focusing of Hyperbolic Phonon Polaritons by Bent Metal Nanowires and Their Polarization Dependence

Phonon transition across an isotopic interface

Ultrabroadband Terahertz Near-Field Nanospectroscopy with a HgCdTe Detector

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