Natural Hyperbolic Dispersion with Anisotropic Epsilon‐Near‐Zero and Epsilon‐Near‐Pole in Squaraine Molecular Film

It is well known that the resolution of bio-molecules in a high resolution electron microscope depends not just on the physical resolving power of the instrument, but also on the stability of these molecules under the electron beam. Experimentally, the damage to the bio-molecules is commo ly monitored by the decrease in the intensity of the diffraction pattern, or more quantitatively by the decrease in the peaks of an energy loss spectrum. In the latter case the exposure, EC, to decrease the peak intensity from IO to I’O can be related to the molecular dissociation cross-section, σD, by EC = ℓn(IO /I’O) /ℓD. Qu ntitative data on damage cross-sections are just being reported, However, the microscopist needs to know the explicit dependence of damage on: (1) the molecular properties, (2) the density and characteristics of the molecular film and that of the support film, if any, (3) the temperature of the molecular film and (4) certain characteristics of the electron microscope used

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Extraordinary Optical Transmission by Hybrid Phonon–Plasmon Polaritons Using hBN Embedded in Plasmonic Nanoslits

Nanomaterials ◽

10.3390/nano11061567 ◽

2021 ◽

Vol 11 (6) ◽

pp. 1567

Author(s):

Shinpei Ogawa ◽

Shoichiro Fukushima ◽

Masaaki Shimatani

Keyword(s):

Optical Transmission ◽

Hexagonal Boron Nitride ◽

Incident Angle ◽

Optical Filters ◽

Extraordinary Optical Transmission ◽

Light Manipulation ◽

Rigorous Coupled Wave Analysis ◽

Fabry Perot ◽

Hyperbolic Dispersion ◽

Rigorous Coupled Wave

Hexagonal boron nitride (hBN) exhibits natural hyperbolic dispersion in the infrared (IR) wavelength spectrum. In particular, the hybridization of its hyperbolic phonon polaritons (HPPs) and surface plasmon resonances (SPRs) induced by metallic nanostructures is expected to serve as a new platform for novel light manipulation. In this study, the transmission properties of embedded hBN in metallic one-dimensional (1D) nanoslits were theoretically investigated using a rigorous coupled wave analysis method. Extraordinary optical transmission (EOT) was observed in the type-II Reststrahlen band, which was attributed to the hybridization of HPPs in hBN and SPRs in 1D nanoslits. The calculated electric field distributions indicated that the unique Fabry–Pérot-like resonance was induced by the hybridization of HPPs and SPRs in an embedded hBN cavity. The trajectory of the confined light was a zigzag owing to the hyperbolicity of hBN, and its resonance number depended primarily on the aspect ratio of the 1D nanoslit. Such an EOT is also independent of the slit width and incident angle of light. These findings can not only assist in the development of improved strategies for the extreme confinement of IR light but may also be applied to ultrathin optical filters, advanced photodetectors, and optical devices.

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Photon Acceleration Using a Time-Varying Epsilon-near-Zero Metasurface

ACS Photonics ◽

10.1021/acsphotonics.0c01929 ◽

2021 ◽

Author(s):

Cong Liu ◽

M. Zahirul Alam ◽

Kai Pang ◽

Karapet Manukyan ◽

Orad Reshef ◽

...

Keyword(s):

Time Varying ◽

Photon Acceleration ◽

Epsilon Near Zero

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Second-harmonic generation enhancement in monolayer transition-metal dichalcogenides by using an epsilon-near-zero substrate

Nanoscale Advances ◽

10.1039/d0na00779j ◽

2021 ◽

Vol 3 (1) ◽

pp. 272-278

Author(s):

Pilar G. Vianna ◽

Aline dos S. Almeida ◽

Rodrigo M. Gerosa ◽

Dario A. Bahamon ◽

Christiano J. S. de Matos

Keyword(s):

Dielectric Constant ◽

Transition Metal ◽

Harmonic Generation ◽

Nonlinear Effect ◽

Second Harmonic ◽

2D Materials ◽

Transition Metal Dichalcogenides ◽

Transition Metal Dichalcogenide ◽

Metal Dichalcogenides ◽

Epsilon Near Zero

The scheme illustrates a monolayer transition-metal dichalcogenide on an epsilon-near-zero substrate. The substrate near-zero dielectric constant is used as the enhancement mechanism to maximize the SHG nonlinear effect on monolayer 2D materials.

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Iron/epoxy random metamaterials with adjustable epsilon-near-zero and epsilon-negative property

Journal of Materials Science Materials in Electronics ◽

10.1007/s10854-021-06150-8 ◽

2021 ◽

Author(s):

Mingxiang Liu ◽

Xiaopeng Lan ◽

Haoyuan Zhang ◽

Peitao Xie ◽

Nannan Wu ◽

...

Keyword(s):

Negative Property ◽

Epsilon Near Zero

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Surface Plasmonic Sensors: Sensing Mechanism and Recent Applications

Sensors ◽

10.3390/s21165262 ◽

2021 ◽

Vol 21 (16) ◽

pp. 5262

Author(s):

Qilin Duan ◽

Yineng Liu ◽

Shanshan Chang ◽

Huanyang Chen ◽

Jin-hui Chen

Keyword(s):

Surface Plasmon Resonance ◽

Optical Fiber ◽

Surface Plasmon ◽

Optical Sensors ◽

Plasmon Resonance ◽

2D Materials ◽

Localized Surface Plasmon ◽

Plasmonic Sensors ◽

Hyperbolic Dispersion ◽

Challenges And Opportunities

Surface plasmonic sensors have been widely used in biology, chemistry, and environment monitoring. These sensors exhibit extraordinary sensitivity based on surface plasmon resonance (SPR) or localized surface plasmon resonance (LSPR) effects, and they have found commercial applications. In this review, we present recent progress in the field of surface plasmonic sensors, mainly in the configurations of planar metastructures and optical-fiber waveguides. In the metastructure platform, the optical sensors based on LSPR, hyperbolic dispersion, Fano resonance, and two-dimensional (2D) materials integration are introduced. The optical-fiber sensors integrated with LSPR/SPR structures and 2D materials are summarized. We also introduce the recent advances in quantum plasmonic sensing beyond the classical shot noise limit. The challenges and opportunities in this field are discussed.

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Graphene-based tunable hyperbolic microcavity

Scientific Reports ◽

10.1038/s41598-020-80022-9 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Michał Dudek ◽

Rafał Kowerdziej ◽

Alessandro Pianelli ◽

Janusz Parka

Keyword(s):

Resonant Mode ◽

Transverse Magnetic ◽

Mid Infrared ◽

Nanophotonic Devices ◽

Wide Range ◽

Fabry Perot ◽

Hyperbolic Dispersion ◽

Low Threshold ◽

Infrared Frequencies ◽

Infrared Wave

AbstractGraphene-based hyperbolic metamaterials provide a unique scaffold for designing nanophotonic devices with active functionalities. In this work, we have theoretically demonstrated that the characteristics of a polarization-dependent tunable hyperbolic microcavity in the mid-infrared frequencies could be realized by modulating the thickness of the dielectric layers, and thus breaking periodicity in a graphene-based hyperbolic metamaterial stack. Transmission of the tunable microcavity shows a Fabry–Perot resonant mode with a Q-factor > 20, and a sixfold local enhancement of electric field intensity. It was found that by varying the gating voltage of graphene from 2 to 8 V, the device could be self-regulated with respect to both the intensity (up to 30%) and spectrum (up to 2.1 µm). In addition, the switching of the device was considered over a wide range of incident angles for both the transverse electric and transverse magnetic modes. Finally, numerical analysis indicated that a topological transition between elliptic and type II hyperbolic dispersion could be actively switched. The proposed scheme represents a remarkably versatile platform for the mid-infrared wave manipulation and may find applications in many multi-functional architectures, including ultra-sensitive filters, low-threshold lasers, and photonic chips.

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