Probing Polaritons in 2D Materials

Luo, Cheng; Guo, Xiaojie; Hu, Hai; Hu, Debo; Wu, Chenchen; Yang, Xiaoxia; Dai, Qing

doi:10.1002/adom.201901416

Cited by 19 publications

(17 citation statements)

References 176 publications

(299 reference statements)

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“…A number of natural hyperbolic materials supporting HPhPs have been discovered, including h-BN [22,23] and MoO 3 [24][25][26], which have been the subject of recent reviews [27,28]. Among these materials, MoO 3 is of particular interest due to its natural in-plane anisotropic dispersion [25].…”

Section: Introductionmentioning

confidence: 99%

Substrate-mediated hyperbolic phonon polaritons in MoO₃

Schwartz

Krylyuk

et al. 2021

Nanophotonics

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Hyperbolic phonon polaritons (HPhPs) are hybrid excitations of light and coherent lattice vibrations that exist in strongly optically anisotropic media, including two-dimensional materials (e.g., MoO3). These polaritons propagate through the material’s volume with long lifetimes, enabling novel mid-infrared nanophotonic applications by compressing light to sub-diffractional dimensions. Here, the dispersion relations and HPhP lifetimes (up to ≈12 ps) in single-crystalline α-MoO3 are determined by Fourier analysis of real-space, nanoscale-resolution polariton images obtained with the photothermal induced resonance (PTIR) technique. Measurements of MoO3 crystals deposited on periodic gratings show longer HPhPs propagation lengths and lifetimes (≈2×), and lower optical compressions, in suspended regions compared with regions in direct contact with the substrate. Additionally, PTIR data reveal MoO3 subsurface defects, which have a negligible effect on HPhP propagation, as well as polymeric contaminants localized under parts of the MoO3 crystals, which are derived from sample preparation. This work highlights the ability to engineer substrate-defined nanophotonic structures from layered anisotropic materials.

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Section: Introductionmentioning

confidence: 99%

Substrate-mediated hyperbolic phonon polaritons in MoO₃

Schwartz

Krylyuk

et al. 2021

Nanophotonics

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“…For example, in recent years, photo‐induced force microscopy techniques employing MIR excitations have been developed to obtain high‐resolution spatial maps of the chemical compositions of heterogeneous materials and nanoscale objects. [ 15–17 ]…”

Section: Introductionmentioning

confidence: 99%

Dynamically Reconfigurable Bipolar Optical Gradient Force Induced by Mid‐Infrared Graphene Plasmonic Tweezers for Sorting Dispersive Nanoscale Objects

Paul

Liu

2021

Advanced Optical Materials

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Existing techniques for optical trapping and manipulation of microscopic objects, such as optical tweezers and plasmonic tweezers, are mostly based on visible and near‐infrared light sources. As it is in general more difficult to confine light to a specific length scale at a longer wavelength, these optical trapping and manipulation techniques have not been extended to the mid‐infrared spectral region or beyond. Here, it is shown that by taking advantage of the fact that many materials have large permittivity dispersions in the mid‐infrared region, optical trapping and manipulation using mid‐infrared excitation can achieve additional functionalities and benefits compared to the existing techniques in the visible and near‐infrared regions. In particular, it is demonstrated that by exploiting the exceedingly high field confinement and large frequency tunability of mid‐infrared graphene plasmonics, high‐performance and versatile mid‐infrared plasmonic tweezers can be realized to selectively trap or repel nanoscale objects of different materials in a dynamically reconfigurable way. This new technique can be utilized for sorting, filtering, and fractionating nanoscale objects in a mixture.

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“…In particular, in situ S/TEM in combination with EELS can be utilized to spatially and energetically resolve various plasmonic resonances. [39][40][41] While a wide range of techniques including scattering scanning-type near optical microscopy (s-SNOM) [42,43] photon electron emission microscopy, [44] cathodoluminescence, [45,46] electron energy loss spectroscopy (EELS) [41,[47][48][49] has previously been used to study the surface plasmon resonances (SPRs), here we choose high-resolution scanning transmission electron microscopy (STEM)-(mono) EELS to characterize plasmonic resonances. While each of these techniques offers unique capabilities, each comes with its own limitations as well.…”

mentioning

confidence: 99%

Nanoscale Mapping and Defect‐Assisted Manipulation of Surface Plasmon Resonances in 2D Bi₂Te₃/Sb₂Te₃ In‐Plane Heterostructures

Moradifar

Nixon

Sharifi

et al. 2022

Advanced Optical Materials

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The Bi2Te3/Sb2Te3 in‐plane heterostructure is reported as a low‐dimensional tunable chalcogenide well suited as plasmonic building block for the visible−UV spectral range. Electron‐driven plasmon excitations of low‐dimensional Bi2Te3/Sb2Te3 are investigated by monochromated electron energy loss spectroscopy spectrum imaging. To resolve the nanoscale spatial distribution of various local plasmonic resonances, singular value decomposition is used to disentangle the spectral data and identify the individual spectral contributions of various corner, edge, and face modes. Furthermore, defect‐plasmon interactions are investigated both for nanoscale intrinsic and thermally induced extrinsic polygonal defects (in situ sublimation). Signature of defect‐induced red shift ranging from a several hundreds of millielectronvolts to a few electronvolts, broadening of various plasmon response, together with selective enhancement and significant variations in their intensity are detected. This study highlights the presence of a heterointerface and identifies defects as physical tuning pathways to modulate the plasmonic response over a broad spectral range. Finally, the experimental observations are compared qualitatively and validated with numerical simulations using the electron‐driven discrete dipole approximation. Low‐dimensional Bi2Te3/Sb2Te3 as a less explored plasmonic system holds great promises as emerging platform for integrated plasmonics. Furthermore, introducing controlled structural defects can open the door for nanoengineering of plasmonic properties in such systems.

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Probing Polaritons in 2D Materials

Cited by 19 publications

References 176 publications

Substrate-mediated hyperbolic phonon polaritons in MoO₃

Substrate-mediated hyperbolic phonon polaritons in MoO₃

Dynamically Reconfigurable Bipolar Optical Gradient Force Induced by Mid‐Infrared Graphene Plasmonic Tweezers for Sorting Dispersive Nanoscale Objects

Nanoscale Mapping and Defect‐Assisted Manipulation of Surface Plasmon Resonances in 2D Bi₂Te₃/Sb₂Te₃ In‐Plane Heterostructures

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Probing Polaritons in 2D Materials

Cited by 19 publications

References 176 publications

Substrate-mediated hyperbolic phonon polaritons in MoO3

Substrate-mediated hyperbolic phonon polaritons in MoO3

Dynamically Reconfigurable Bipolar Optical Gradient Force Induced by Mid‐Infrared Graphene Plasmonic Tweezers for Sorting Dispersive Nanoscale Objects

Nanoscale Mapping and Defect‐Assisted Manipulation of Surface Plasmon Resonances in 2D Bi2Te3/Sb2Te3 In‐Plane Heterostructures

Contact Info

Product

Resources

About

Substrate-mediated hyperbolic phonon polaritons in MoO₃

Substrate-mediated hyperbolic phonon polaritons in MoO₃

Nanoscale Mapping and Defect‐Assisted Manipulation of Surface Plasmon Resonances in 2D Bi₂Te₃/Sb₂Te₃ In‐Plane Heterostructures