High-Quality All-Inorganic Perovskite CsPbBr<sub>3</sub> Microsheet Crystals as Low-Loss Subwavelength Exciton–Polariton Waveguides

Li, Zijuan; Sun, Fengsheng; Zheng, Zebo; Davydov, Albert V.; Deng, Shaozhi; Zhang, Huairuo; Chen, Huanjun; Liu, Fei

doi:10.1021/acs.nanolett.0c04908

Cited by 23 publications

(23 citation statements)

References 78 publications

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“…Thus, we reveal enhanced losses of the WMs close to the exciton resonance around ∼1.5 eV. Due to the dominant out-of-plane polarization of the TM 0 modes and the in-plane dipole of the exciton, the losses stay moderate even for energies close to the resonance in contrast to isotropic media such as perovskites or dye films . Along these lines, the TE modes experience stronger damping due to the exciton in ReS 2 compared to the TM counterparts, which renders the observation of the former beyond >1.5 eV more challenging.…”

Section: Resultsmentioning

confidence: 81%

“…In Supporting Information (SI), Section 1, we outline the key equations and verify this formalism by analyzing fringe patterns obtained for various rotations of the ReS 2 crystal. Once the correct wavevector k has been identified for a given photon energy with eq S1, the dielectric properties can be inferred as previously reported for various molybdenum − and tungsten-based , dichalcogenides or inorganic perovskites . This approach has recently been demonstrated to even resolve transient changes to the optical properties on femtosecond time scales resolve pulsed laser sources. , …”

Section: Resultsmentioning

confidence: 93%

“…Once the correct wavevector k has been identified for a given photon energy with eq S1, the dielectric properties can be inferred as previously reported for various molybdenum 32−38 and tungsten-based 34,39 dichalcogenides or inorganic perovskites. 40 This approach has recently been demonstrated to even resolve transient changes to the optical properties on femtosecond time scales resolve pulsed laser sources. 34,39 Due to the strong in-plane anisotropy, ReS 2 preferentially cleaves along specific crystallographic directions upon mechanical exfoliation.…”

Section: ■ Resultsmentioning

confidence: 99%

“…In combination with cryogenic near-field microscopy, 53 exciton polaritons 54 that are anisotropic and self-hybridized 55 or highly confined 56 could thus be imaged. Finally, our technique is also easily transferrable to the visible 40 or mid-infrared range, 57 paving the way for a full characterization of novel materials for nanophotonic applications across various spectral ranges.…”

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confidence: 99%

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In-Plane Anisotropy in Biaxial ReS₂ Crystals Probed by Nano-Optical Imaging of Waveguide Modes

et al. 2022

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Near-field imaging has emerged as a reliable probe of the dielectric function of van der Waals crystals. In principle, analyzing the propagation patterns of subwavelength waveguide modes (WMs) allows for the extraction of the full dielectric tensor. Yet, previous studies have mostly been restricted to high-symmetry materials or narrowband probing. Here, we resolve in-plane anisotropic WMs in thin rhenium disulfide (ReS 2 ) crystals across a wide range of near-infrared frequencies. By tracing the evolution of these modes as a function of crystallographic direction, polarization of the electric field, and sample thickness, we have determined the anisotropic dielectric tensor, including the elusive out-of-plane response. The excitonic absorption at ∼1.5 eV manifests itself as a clear backbending feature in the WM dispersion and a reduction of the quality factors as fully supported by numerical calculations. Our results extend the sensitivity of near-field microscopy toward biaxial anisotropy and provide key insights into the optoelectronic properties of ReS 2 .

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Section: Resultsmentioning

confidence: 81%

Section: Resultsmentioning

confidence: 93%

Section: ■ Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

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In-Plane Anisotropy in Biaxial ReS₂ Crystals Probed by Nano-Optical Imaging of Waveguide Modes

et al. 2022

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“…Inorganic halide perovskite with general formula CsPbX 3 , where X represents halide ions either chlorine (Cl-), bromine (Br-), or iodine (I-) is widely used in many optoelectronic devices including high efficiency solar cells, self-powered photodetectors, waveguides, improved quantum efficiency light-emitting diodes, lasing and bioimaging. [7][8][9][10] Researchers are working to fabricate highly dense and uniform inorganic perovskite films with minimum roughness and better film morphology for high performance optoelectronic applications. There are several reports in which researchers reported improved surface morphology and better efficiencies of devices.…”

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confidence: 99%

A Low Power‐consumption and Transient Nonvolatile Memory Based on Highly Dense All‐Inorganic Perovskite Films

Abbas

Hassan

Khan

et al. 2022

Adv Elect Materials

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Inorganic perovskite‐based memory devices have attracted tremendous attention due to their higher level of stability, more feasible synthesis conditions and better performance, as compared to organic–inorganic hybrid perovskite‐based devices. However, better film morphology is an essential issue for the performance of these devices. Here, the all‐inorganic halide perovskite cesium lead bromide (CsPbBr3) films are successfully fabricated via a unique solution processable deposition method at ambient conditions. These films possess satisfactory surface morphology with high crystallinity. These are utilized for reproducible resistive switching layers in the gold/CsPbBr3/indium tin oxide/Glass memory applications. A series of resistive switching layers (i.e., CsPbBr3) with varied thicknesses in the range of 200–500 nm are precisely tailored. The resistive switching responses and retention properties of CsPbBr3 based‐memory devices exhibit long‐term retention (exceeding 10000 s), high on/off ratio (up to 10000), low power consumption (set voltage at 0.25V), and good reproducibility. A model for the formation of filaments in the CsPbBr3 layer is proposed to describe the resistive switching mechanism. Furthermore, the devices exhibit excellent transient behavior, which is beneficial for the security of data storage. These characteristics reveal that cesium lead halide based memristor is promising to be utilized as the next‐generation smart memory device.

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Polaritons in Van der Waals Heterostructures

et al. 2023

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Tunable nanophotonic systems that can be integrated with silicon and manipulate light at deep-subwavelength scales is of paramount importance for photonic integrated circuits, [1] enhanced light-matter interaction, [2] sub-diffraction imaging, [3] metamaterials, [4] and negative refraction [5] among other feats. In particular, polaritons in 2D materials exhibit the highest degree of mode confinement. [6] A variety of highly confined polaritons with unique properties [6,7] have been demonstrated in 2D materials, for example, electrically tunable plasmons in graphene, [7a,8] ultralow-loss phonon polaritons in hexagonal boron nitride (h-BN) [9] and α-MoO 3 , [7c,7d] room-temperature exciton polaritons in MoSe 2 , [10] WSe 2 [11] and CsPbBr 3 microsheets, [12] and Cooper-pair polaritons. [13] These surface modes have prompted the exploration of multiple potential applications, such as surface-enhanced infrared spectroscopy, [8a,14] optical sensors, [15] nanolasers, [16] light modulators, [17] and nanophotonic circuits. [18] However, in most practical applications, important challenges, such as relatively large optical losses, reduced operation frequency range, and slow modulation speed, are remaining.The hybrid light-matter nature of polaritons (i.e., quasiparticles made up of a photons coupled to polarization charges in a material) can be passively tuned by designing the composition and geometry of the hosting materials, [9,19] offering important advantages for nanophotonic systems. [6a,20] Recently, van der Waals heterostructures (vdWHs), which can be fabricated by exfoliating 2D materials down to isolated monolayers and subsequently reassembling them in a layer by layer fashion in precisely chosen compositions, stacking sequence, and twist angles, provide a versatile way to customize polaritons. [21] For example, an ultralong lifetime graphene plasmon in graphene/h-BN vdWHs, [7a,22] an efficient all-optical modulation of graphene plasmons in the graphene/ monolayer MoS 2 vdWHs, [23] a strong plasmonic nonlinear response in graphene/metal heterostructures [24] have been demonstrated. Moreover, the behavior of polaritons can also be modulated by creating moiré patterns in the vdWHs, such that one can obtain, for example, an extremely long plasmon lifetime (≈3 ps) in stacked bilayer graphene, [25] photonic crystals of twisted bilayer graphene (TBLG), [26] and tunable topological transitions of phonon polaritons in twisted α-MoO 3 bilayers. [27] 2D monolayers supporting a wide variety of highly confined plasmons, phonon polaritons, and exciton polaritons can be vertically stacked in van der Waals heterostructures (vdWHs) with controlled constituent layers, stacking sequence, and even twist angles. vdWHs combine advantages of 2D material polaritons, rich optical structure design, and atomic scale integration, which have greatly extended the performance and functions of polaritons, such as wide frequency range, long lifetime, ultrafast all-optical modulation, and photonic crystals for nanoscale light. Here, th...

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High-Quality All-Inorganic Perovskite CsPbBr₃ Microsheet Crystals as Low-Loss Subwavelength Exciton–Polariton Waveguides

Cited by 23 publications

References 78 publications

In-Plane Anisotropy in Biaxial ReS₂ Crystals Probed by Nano-Optical Imaging of Waveguide Modes

In-Plane Anisotropy in Biaxial ReS₂ Crystals Probed by Nano-Optical Imaging of Waveguide Modes

A Low Power‐consumption and Transient Nonvolatile Memory Based on Highly Dense All‐Inorganic Perovskite Films

Polaritons in Van der Waals Heterostructures

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High-Quality All-Inorganic Perovskite CsPbBr3 Microsheet Crystals as Low-Loss Subwavelength Exciton–Polariton Waveguides

Cited by 23 publications

References 78 publications

In-Plane Anisotropy in Biaxial ReS2 Crystals Probed by Nano-Optical Imaging of Waveguide Modes

In-Plane Anisotropy in Biaxial ReS2 Crystals Probed by Nano-Optical Imaging of Waveguide Modes

A Low Power‐consumption and Transient Nonvolatile Memory Based on Highly Dense All‐Inorganic Perovskite Films

Polaritons in Van der Waals Heterostructures

Contact Info

Product

Resources

About

High-Quality All-Inorganic Perovskite CsPbBr₃ Microsheet Crystals as Low-Loss Subwavelength Exciton–Polariton Waveguides

In-Plane Anisotropy in Biaxial ReS₂ Crystals Probed by Nano-Optical Imaging of Waveguide Modes

In-Plane Anisotropy in Biaxial ReS₂ Crystals Probed by Nano-Optical Imaging of Waveguide Modes