High-efficiency modulation of coupling between different polaritons in an in-plane graphene/hexagonal boron nitride heterostructure

Nanoscale ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 2703-2709 ◽  
Author(s):  
Xiangdong Guo ◽  
Hai Hu ◽  
Debo Hu ◽  
Baoxin Liao ◽  
Ke Chen ◽  
...  
Keyword(s):  
Boron Nitride ◽  
High Efficiency ◽  
Hexagonal Boron Nitride ◽  
Van Der Waals ◽  
Two Dimensional ◽  
Low Loss ◽  
Nanophotonic Devices ◽  
Phonon Polaritons ◽  
Graphene Plasmons

Two-dimensional van der Waals (vdW) materials have a full set of highly confined polariton modes, such as low-loss phonon polaritons and dynamically tunable graphene plasmons, which provide a solution for integrated nanophotonic devices by combining the unique advantages of different polaritons.

Dioxin sensing properties of graphene and hexagonal boron nitride based van der Waals solids: a first-principles study

RSC Advances ◽  
2016 ◽  
Vol 6 (108) ◽  
pp. 107114-107126 ◽  
Author(s):  
M. Kamaraj ◽  
J. Vijaya Sundar ◽  
V. Subramanian
Keyword(s):  
Boron Nitride ◽  
Dft Calculations ◽  
Electronic Properties ◽  
First Principles ◽  
Hexagonal Boron Nitride ◽  
Van Der Waals ◽  
Two Dimensional ◽  
Sensing Properties ◽  
First Principles Study

The changes in the electronic properties of single and bilayers of graphene and hexagonal boron nitride two dimensional sheets have been investigated upon interaction with 2,3,7,8-tetrachlorodibenzo-p-dioxin by employing the DFT calculations.

Photon Tunneling via Coupling Graphene Plasmons With Phonon Polaritons of Hexagonal Boron Nitride in Reststrahlen Bands

2021 ◽  
Author(s):  
Ruiyi Liu ◽  
Xiaohu Wu ◽  
Zheng Cui
Keyword(s):  
Boron Nitride ◽  
Chemical Potential ◽  
Hexagonal Boron Nitride ◽  
Near Field ◽  
Tunneling Probability ◽  
Coupling Mechanism ◽  
Work Study ◽  
Photon Tunneling ◽  
Phonon Polaritons ◽  
Graphene Plasmons

Abstract The photon tunneling probability is the most important thing in near-field radiative heat transfer (NFRHT). This work study the photon tunneling via coupling graphene plasmons with phonon polaritons in hexagonal boron nitride (hBN). We consider two cases of the optical axis of hBN along z-axis and x-axis, respectively. We investigate the NFRHT between graphene-covered bulk hBN, and compare it with that of bare bulk hBN. Our results show that in Reststrahlen bands, the coupling of graphene plasmons and phonon polaritons in hBN can either suppress or enhance the photon tunneling probability, depending on the chemical potential of graphene and frequency. This conclusion holds when the optiacal axis of hBN is either along z-axis or x-axis. The findings in this work not only deepen our understanding of coupling mechanism between graphene plasmons with phonon polaritons, but also provide a theoretical basis for controlling photon tunneling in graphene covered hyperbolic materials.

scholarly journals Making van der Waals Heterostructures Assembly Accessible to Everyone

Nanomaterials ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 2305
Author(s):  
Sergey G. Martanov ◽  
Natalia K. Zhurbina ◽  
Mikhail V. Pugachev ◽  
Aliaksandr I. Duleba ◽  
Mark A. Akmaev ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Hexagonal Boron Nitride ◽  
Condensed Matter ◽  
Van Der Waals ◽  
Atomic Layer ◽  
Two Dimensional ◽  
Van Der Waals Heterostructures ◽  
Online Retail ◽  
Two Dimensional Materials ◽  
Retail Services

Van-der Waals heterostructures assembled from one or few atomic layer thickness crystals are becoming increasingly more popular in condensed matter physics. These structures are assembled using transfer machines, those are based on mask aligners, probe stations or are home-made. For many laboratories it is vital to build a simple, convenient and universal transfer machine. In this paper we discuss the guiding principles for the design of such a machine, review the existing machines and demonstrate our own construction, that is powerful and fast-in-operation. All components of this machine are extremely cheap and can be easily purchased using common online retail services. Moreover, assembling a heterostructure out of exfoliated commercially available hexagonal boron nitride and tungsten diselenide crystals with a pick-up technique and using the microphotolumenescence spectra, we show well-resolved exciton and trion lines, as a results of disorder suppression in WSe2 monolayer. Our results thus show that technology of the two-dimensional materials and heterostructures becomes accessible to anyone.

Manipulating phonon polaritons in low loss 11B enriched hexagonal boron nitride with polarization control

Nanoscale ◽  
2020 ◽  
Vol 12 (15) ◽  
pp. 8188-8193 ◽  
Author(s):  
Lu Wang ◽  
Runkun Chen ◽  
Mengfei Xue ◽  
Song Liu ◽  
James H. Edgar ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Hexagonal Boron Nitride ◽  
Low Loss ◽  
Polarization Control ◽  
Phonon Polaritons

An effective approach to reducing phonon polariton damping and manipulating phonon polariton excitation in hBN via polarization control.

scholarly journals Tunable plasmon-phonon polaritons in anisotropic 2D materials on hexagonal boron nitride

Nanophotonics ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 3909-3920
Author(s):  
Hodjat Hajian ◽  
Ivan D. Rukhlenko ◽  
George W. Hanson ◽  
Tony Low ◽  
Bayram Butun ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Emission Rate ◽  
Local Density ◽  
Hexagonal Boron Nitride ◽  
2D Materials ◽  
Two Dimensional ◽  
Spontaneous Emission Rate ◽  
Mid Infrared ◽  
Phonon Polaritons ◽  
Topological Transitions

AbstractMid-infrared (MIR) plasmon-phonon features of heterostructures composing of a plasmonic anisotropic two-dimensional material (A2DM) on a hexagonal boron nitride (hBN) film are analyzed. We derive the exact dispersion relations of plasmon-phonons supported by the heterostructures and demonstrate the possibility of topological transitions of these modes within the second Reststrahlen band of hBN. The topological transitions lead to enhanced local density of plasmon-phonon states, which intensifies the spontaneous emission rate, if the thickness of the hBN layer is appropriately chosen. We also investigate a lateral junction formed by A2DM/hBN and A2DM, demonstrating that one can realize asymmetric guiding, beaming, and unidirectionality of the hybrid guided modes. Our findings demonstrate potential capabilities of the A2DM/hBN heterostructures for active tunable light–matter interactions and asymmetric in-plane polariton nanophotonics in the MIR range.

scholarly journals In situ manipulation of van der Waals heterostructures for twistronics

2020 ◽  
Vol 6 (49) ◽  
pp. eabd3655
Author(s):  
Yaping Yang ◽  
Jidong Li ◽  
Jun Yin ◽  
Shuigang Xu ◽  
Ciaran Mullan ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Hexagonal Boron Nitride ◽  
2D Materials ◽  
Twist Angle ◽  
Van Der Waals ◽  
Two Dimensional ◽  
Van Der Waals Heterostructures ◽  
Material Systems ◽  
Nontrivial Topology

In van der Waals heterostructures, electronic bands of two-dimensional (2D) materials, their nontrivial topology, and electron-electron interactions can be markedly changed by a moiré pattern induced by twist angles between different layers. This process is referred to as twistronics, where the tuning of twist angle can be realized through mechanical manipulation of 2D materials. Here, we demonstrate an experimental technique that can achieve in situ dynamical rotation and manipulation of 2D materials in van der Waals heterostructures. Using this technique, we fabricated heterostructures where graphene is perfectly aligned with both top and bottom encapsulating layers of hexagonal boron nitride. Our technique enables twisted 2D material systems in one single stack with dynamically tunable optical, mechanical, and electronic properties.

scholarly journals Engineering phonon polaritons in van der Waals heterostructures to enhance in-plane optical anisotropy

2019 ◽  
Vol 5 (4) ◽  
pp. eaau7171 ◽  
Author(s):  
Kundan Chaudhary ◽  
Michele Tamagnone ◽  
Mehdi Rezaee ◽  
D. Kwabena Bediako ◽  
Antonio Ambrosio ◽  
...  
Keyword(s):  
Optical Anisotropy ◽  
Hexagonal Boron Nitride ◽  
Near Field ◽  
Van Der Waals ◽  
Microscopy Study ◽  
Refractive Indices ◽  
Optical And Electrical Properties ◽  
Nanophotonic Devices ◽  
Two Dimensional Materials ◽  
Phonon Polaritons

Van der Waals (vdW) heterostructures assembled from layers of two-dimensional materials have attracted considerable interest due to their novel optical and electrical properties. Here, we report a scattering-type scanning near-field optical microscopy study of hexagonal boron nitride on black phosphorus (h-BN/BP) heterostructures, demonstrating the first direct observation of in-plane anisotropic phonon polariton modes in vdW heterostructures. Notably, the measured in-plane optical anisotropy along the armchair and zigzag crystal axes exceeds the ratio of refractive indices of BP in the x-y plane. We explain that this enhancement is due to the high confinement of the phonon polaritons in h-BN. We observe a maximum in-plane optical anisotropy of αmax = 1.25 in the frequency spectrum at 1405 to 1440 cm−1. These results provide new insights into the behavior of polaritons in vdW heterostructures, and the observed anisotropy enhancement paves the way to novel nanophotonic devices and to a new way to characterize optical anisotropy in thin films.

scholarly journals Extracting the Infrared Permittivity of SiO2 Substrates Locally by Near-Field Imaging of Phonon Polaritons in a van der Waals Crystal

Nanomaterials ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 120
Author(s):  
Patricia Aguilar-Merino ◽  
Gonzalo Álvarez-Pérez ◽  
Javier Taboada-Gutiérrez ◽  
Jiahua Duan ◽  
Iván Prieto ◽  
...  
Keyword(s):  
Molybdenum Trioxide ◽  
Hexagonal Boron Nitride ◽  
Near Field ◽  
Van Der Waals ◽  
Field Studies ◽  
Dielectric Substrates ◽  
Nanophotonic Devices ◽  
Near Field Imaging ◽  
Materials Research ◽  
Phonon Polaritons

Layered materials in which individual atomic layers are bonded by weak van der Waals forces (vdW materials) constitute one of the most prominent platforms for materials research. Particularly, polar vdW crystals, such as hexagonal boron nitride (h-BN), alpha-molybdenum trioxide (α-MoO3) or alpha-vanadium pentoxide (α-V2O5), have received significant attention in nano-optics, since they support phonon polaritons (PhPs)―light coupled to lattice vibrations― with strong electromagnetic confinement and low optical losses. Recently, correlative far- and near-field studies of α-MoO3 have been demonstrated as an effective strategy to accurately extract the permittivity of this material. Here, we use this accurately characterized and low-loss polaritonic material to sense its local dielectric environment, namely silica (SiO2), one of the most widespread substrates in nanotechnology. By studying the propagation of PhPs on α-MoO3 flakes with different thicknesses laying on SiO2 substrates via near-field microscopy (s-SNOM), we extract locally the infrared permittivity of SiO2. Our work reveals PhPs nanoimaging as a versatile method for the quantitative characterization of the local optical properties of dielectric substrates, crucial for understanding and predicting the response of nanomaterials and for the future scalability of integrated nanophotonic devices.

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