Real-space observation of ultraconfined in-plane anisotropic acoustic terahertz plasmon polaritons

Chen, S.; Leng, Pengliang; Konečná, Andrea; Modin, Evgeny; Gutierrez-Amigo, Martin; Vicentini, Edoardo; Martín‐García, Beatriz; Barra-Burillo, María; Niehues, Iris; Escudero, C. Maciel; Xie, Xin; Hueso, Luis E.; Artacho, Emilio; Aizpurua, Javier; Errea, Ion; Vergniory, Maia G.; Xiu, Faxian; Hillenbrand, Rainer

doi:10.1038/s41563-023-01547-8

Cited by 23 publications

(15 citation statements)

References 54 publications

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“…However, these indirect measurements are acquired in the far-field and are affected by coupling between the array elements, as has already been discussed in previous studies. , Furthermore, some modes, e.g., “dark” modes, prove to be elusive due to low visibility in the far field. Subwavelength resolution analysis of optical modes supported by THz MM resonators can be achieved by using scattering-type scanning near-field optical nanoscopy (conventionally named s-SNOM − ) and by using aperture-type scanning near-field optical microscopy (a-SNOM). − Near-field spectroscopy offers a unique tool for the investigation of quantum devices, in nanospectroscopy, and for the observation of plasmon polaritons also in graphene, topological insulators and phase change materials …”

Section: Introductionmentioning

confidence: 99%

“…Subwavelength resolution analysis of optical modes supported by THz MM resonators can be achieved by using scatteringtype scanning near-field optical nanoscopy (conventionally named s-SNOM 30−38 ) and by using aperture-type scanning near-field optical microscopy (a-SNOM). 39−43 Near-field spectroscopy offers a unique tool for the investigation of quantum devices, 33 in nanospectroscopy, 34 and for the observation of plasmon polaritons 34 also in graphene, 35 topological insulators 37 and phase change materials. 38 Here, a THz broadband a-SNOM is used to study individual metallic asymmetric D-split-ring THz resonators (ADSRs).…”

Section: ■ Introductionmentioning

confidence: 99%

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Near-Field Spectroscopy of Individual Asymmetric Split-Ring Terahertz Resonators

Hale

Zaman

et al. 2023

ACS Photonics

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Metamaterial resonators have become an efficient and versatile platform in the terahertz frequency range, finding applications in integrated optical devices, such as active modulators and detectors, and in fundamental research, e.g., ultrastrong light−matter investigations. Despite their growing use, characterization of modes supported by these subwavelength elements has proven to be challenging and it still relies on indirect observation of the collective far-field transmission/reflection properties of resonator arrays. Here, we present a broadband time-domain spectroscopic investigation of individual metamaterial resonators via a THz aperture scanning near-field microscope (a-SNOM). The time-domain a-SNOM allows the mapping and quantitative analysis of strongly confined modes supported by the resonators. In particular, a cross-polarized configuration presented here allows an investigation of weakly radiative modes. These results hold great potential to advance future metamaterial-based optoelectronic platforms for fundamental research in THz photonics.

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Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Near-Field Spectroscopy of Individual Asymmetric Split-Ring Terahertz Resonators

Hale

Zaman

et al. 2023

ACS Photonics

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“…s-SNOM-based nanoscopy is a powerful technique for characterizing nanophotonic systems, material identification, and probing exotic nanoscale and quantum phenomenon with 10–20 nm spatial resolution. ,− This technique allows us to gather local information that is either lost or averaged out in the far-field response as well as to couple into excitations which are difficult to access from the far-field. In this study, we used a commercial s-SNOM (Neaspec, Attocube) configured with an asymmetric Michelson interferometer and a broadband MIR illuminating source (Figure b).…”

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confidence: 99%

Unveiling Local Optical Properties Using Nanoimaging Phase Mapping in High-Index Topological Insulator Bi₂Se₃ Resonant Nanostructures

Nandi,

Cohen,

Singh

et al. 2023

Nano Lett.

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Topological insulators are materials characterized by an insulating bulk and high mobility topologically protected surface states, making them promising candidates for future optoelectronic and quantum devices. Although their electronic properties have been extensively studied, their mid-infrared (MIR) properties and prospective photonic capabilities have not been fully uncovered. Here, we use a combination of far-field and nearfield nanoscale imaging and spectroscopy to study chemical vapor deposition-grown Bi 2 Se 3 nanobeams (NBs). We extract the MIR optical constants of Bi 2 Se 3 , revealing refractive index values as high as n ∼ 6.4, and demonstrate that the NBs support Mie resonances across the MIR. Local near-field reflection phase mapping reveals domains of various phase shifts, providing information on the local optical properties of the NBs. We experimentally measure up to 2π phase-shift across the resonance, in excellent agreement with finite-difference time-domain simulations. This work highlights the potential of Bi 2 Se 3 for quantum circuitry, nonlinear generation, high-Q metaphotonics, and photodetection.

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“…The pale green plane displays the (−101) surface plane of nanoplates. The b axis lies in the surface plane and is parallel to the long edge of the nanoplates . The space group of bulk β-Ag 2 Te is P 2 1/ c (No.…”

mentioning

confidence: 99%

“…The b axis lies in the surface plane and is parallel to the long edge of the nanoplates. 42 The space group of bulk β-Ag 2 Te is P2 1/c (No. 14) with inversion symmetry.…”

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confidence: 99%

Nondegenerate Integer Quantum Hall Effect from Topological Surface States in Ag₂Te Nanoplates

Leng,

Qian,

Cao

et al. 2023

Nano Lett.

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The quantum Hall effect is one of the exclusive properties displayed by Dirac Fermions in topological insulators, which propagates along the chiral edge state and gives rise to quantized electron transport. However, the quantum Hall effect formed by the nondegenerate Dirac surface states has been elusive so far. Here, we demonstrate the nondegenerate integer quantum Hall effect from the topological surface states in three-dimensional (3D) topological insulator β-Ag 2 Te nanostructures. Surface-state dominant conductance renders quantum Hall conductance plateaus with a step of e 2 /h, along with typical thermopower behaviors of two-dimensional (2D) massless Dirac electrons. The 2D nature of the topological surface states is proven by the electrical and thermal transport responses under tilted magnetic fields. Moreover, the degeneracy of the surface states is removed by structure inversion asymmetry (SIA). The evidenced SIA-induced nondegenerate integer quantum Hall effect in low-symmetry β-Ag 2 Te has implications for both fundamental study and the realization of topological magneto-electric effects.

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Real-space observation of ultraconfined in-plane anisotropic acoustic terahertz plasmon polaritons

Cited by 23 publications

References 54 publications

Near-Field Spectroscopy of Individual Asymmetric Split-Ring Terahertz Resonators

Near-Field Spectroscopy of Individual Asymmetric Split-Ring Terahertz Resonators

Unveiling Local Optical Properties Using Nanoimaging Phase Mapping in High-Index Topological Insulator Bi₂Se₃ Resonant Nanostructures

Nondegenerate Integer Quantum Hall Effect from Topological Surface States in Ag₂Te Nanoplates

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Real-space observation of ultraconfined in-plane anisotropic acoustic terahertz plasmon polaritons

Cited by 23 publications

References 54 publications

Near-Field Spectroscopy of Individual Asymmetric Split-Ring Terahertz Resonators

Near-Field Spectroscopy of Individual Asymmetric Split-Ring Terahertz Resonators

Unveiling Local Optical Properties Using Nanoimaging Phase Mapping in High-Index Topological Insulator Bi2Se3 Resonant Nanostructures

Nondegenerate Integer Quantum Hall Effect from Topological Surface States in Ag2Te Nanoplates

Contact Info

Product

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Unveiling Local Optical Properties Using Nanoimaging Phase Mapping in High-Index Topological Insulator Bi₂Se₃ Resonant Nanostructures

Nondegenerate Integer Quantum Hall Effect from Topological Surface States in Ag₂Te Nanoplates