scholarly journals Graphene-Coated Elliptical Nanowires for Low Loss Subwavelength Terahertz Transmission

2019 ◽  
Vol 9 (11) ◽  
pp. 2351 ◽  
Author(s):  
Da Teng ◽  
Kai Wang ◽  
Zhe Li ◽  
Yongzhe Zhao ◽  
Gao Zhao ◽  
...  
Keyword(s):  
Chemical Potential ◽  
Infrared Range ◽  
Support Surface ◽  
Low Loss ◽  
Propagation Length ◽  
Promising Alternative ◽  
Mid Infrared ◽  
Terahertz Transmission ◽  
Mode Area ◽  
Thz Waves

Graphene has been recently proposed as a promising alternative to support surface plasmons with its superior performances in terahertz and mid-infrared range. Here, we propose a graphene-coated elliptical nanowire (GCENW) structure for subwavelength terahertz waveguiding. The mode properties and their dependence on frequency, nanowire size, permittivity and chemical potential of graphene are studied in detail by using a finite element method, they are also compared with the graphene-coated circular nanowires (GCCNWs). Results showed that the ratio of the long and short axes (b/a) of the elliptical nanowire had significant influence on mode properties, they also showed that a propagation length over 200 μm and a normalized mode area of approximately 10−4~10−3 could be obtained. Increasing b/a could simultaneously achieve both long propagation length and very small full width at half maximum (FWHM) of the focal spots. When b/a = 10, a pair of focal spots about 40 nm could be obtained. Results also showed that the GCENW had a better waveguiding performance when compared with the corresponding GCCNWs. The manipulation of Terahertz (THz) waves at a subwavelength scale using graphene plasmon (GP) may lead to applications in tunable THz components, imaging, and nanophotonics.

scholarly journals High-Performance Transmission of Surface Plasmons in Graphene-Covered Nanowire Pairs with Substrate

Nanomaterials ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 1594 ◽  
Author(s):  
Da Teng ◽  
Kai Wang ◽  
Qiongsha Huan ◽  
Yongzhe Zhao ◽  
Yanan Tang
Keyword(s):  
Surface Plasmons ◽  
High Performance ◽  
Infrared Range ◽  
Support Surface ◽  
Propagation Length ◽  
Promising Alternative ◽  
Silica Substrate ◽  
Nanophotonic Devices ◽  
Substrate Layer ◽  
Potential Applications

Graphene was recently proposed as a promising alternative to support surface plasmons with superior performances in the mid-infrared range. Here, we theoretically show that high-performance and low-loss transmission of graphene plasmons can be achieved by adding a silica substrate to the graphene-covered nanowire pairs. The effect of the substrate layer on mode properties has been intensively investigated by using the finite element method. Furthermore, the results show that inserting a low index material layer between the nanowire and substrate could compensate for the loss accompanied by the substrate, thus the mode properties could be adjusted to fulfill better performance. A reasonable propagation length of 15 μm and an ultra-small normalized mode area about ~10−4 could be obtained at 30 THz. The introduction of the substrate layer is crucial for practical fabrication, which provides additional freedom to tune the mode properties. The graphene-covered nanowire pairs with an extra substrate may inspire potential applications in tunable integrated nanophotonic devices.

scholarly journals Graphene-based long-range SPP hybrid waveguide with ultra-long propagation length in mid-infrared range

2016 ◽  
Vol 24 (5) ◽  
pp. 5376 ◽  
Author(s):  
Jian-Ping Liu ◽  
Xiang Zhai ◽  
Ling-Ling Wang ◽  
Hong-Ju Li ◽  
Fang Xie ◽  
...  
Keyword(s):  
Long Range ◽  
Infrared Range ◽  
Propagation Length ◽  
Mid Infrared ◽  
Hybrid Waveguide

scholarly journals Graphene Nanoribbon Gap Waveguides for Dispersionless and Low-Loss Propagation with Deep-Subwavelength Confinement

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1302
Author(s):  
Zhiyong Wu ◽  
Lei Zhang ◽  
Tingyin Ning ◽  
Hong Su ◽  
Irene Ling Li ◽  
...  
Keyword(s):  
High Performance ◽  
Chemical Potential ◽  
Shape Change ◽  
Optical Switch ◽  
Pulse Amplitude ◽  
Propagation Distance ◽  
Graphene Nanoribbon ◽  
Low Loss ◽  
High Loss ◽  
On Chip

Surface plasmon polaritons (SPPs) have been attracting considerable attention owing to their unique capabilities of manipulating light. However, the intractable dispersion and high loss are two major obstacles for attaining high-performance plasmonic devices. Here, a graphene nanoribbon gap waveguide (GNRGW) is proposed for guiding dispersionless gap SPPs (GSPPs) with deep-subwavelength confinement and low loss. An analytical model is developed to analyze the GSPPs, in which a reflection phase shift is employed to successfully deal with the influence caused by the boundaries of the graphene nanoribbon (GNR). It is demonstrated that a pulse with a 4 μm bandwidth and a 10 nm mode width can propagate in the linear passive system without waveform distortion, which is very robust against the shape change of the GNR. The decrease in the pulse amplitude is only 10% for a propagation distance of 1 μm. Furthermore, an array consisting of several GNRGWs is employed as a multichannel optical switch. When the separation is larger than 40 nm, each channel can be controlled independently by tuning the chemical potential of the corresponding GNR. The proposed GNRGW may raise great interest in studying dispersionless and low-loss nanophotonic devices, with potential applications in the distortionless transmission of nanoscale signals, electro-optic nanocircuits, and high-density on-chip communications.

scholarly journals Design of mid-infrared filter array based on plasmonic metal nanodiscs array and its application to on-chip spectrometer

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hwa-Seub Lee ◽  
Gyu-Weon Hwang ◽  
Tae-Yeon Seong ◽  
Jongkil Park ◽  
Jae Wook Kim ◽  
...  
Keyword(s):  
Nanoimprint Lithography ◽  
Filter Design ◽  
Reconstruction Technique ◽  
Filter Function ◽  
Promising Alternative ◽  
Mid Infrared ◽  
Spectrum Reconstruction ◽  
Filter Array ◽  
On Chip ◽  
Multispectral Filter Array

AbstractMid-infrared wavelengths are called the molecular fingerprint region because it contains the fundamental vibrational modes inherent to the substances of interest. Since the mid-infrared spectrum can provide non-destructive identification and quantitative analysis of unknown substances, miniaturized mid-infrared spectrometers for on-site diagnosis have attained great concern. Filter-array based on-chip spectrometer has been regarded as a promising alternative. In this study, we explore a way of applying a pillar-type plasmonic nanodiscs array, which is advantageous not only for excellent tunability of resonance wavelength but also for 2-dimensional integration through a single layer process, to the multispectral filter array for the on-chip spectrometer. We theoretically and experimentally investigated the optical properties of multi-periodic triangular lattices of metal nanodiscs array that act as stopband filters in the mid-infrared region. Soft-mold reverse nanoimprint lithography with a subsequent lift-off process was employed to fabricate the multispectral filter array and its filter function was successfully extracted using a Fourier transform infrared microscope. With the measured filter function, we tested the feasibility of target spectrum reconstruction using a Tikhonov regularization method for an ill-posed linear problem and evaluated its applicability to the infrared spectroscopic sensor that monitors an oil condition. These results not only verify that the multispectral filter array composed of stopband filters based on the metal nanodiscs array when combined with the spectrum reconstruction technique, has great potential for use to a miniaturized mid-infrared on-chip spectrometer, but also provide effective guidance for the filter design.

scholarly journals Nonlinear optical response of low loss silicon germanium waveguides in the mid-infrared

2015 ◽  
Vol 23 (7) ◽  
pp. 8261 ◽  
Author(s):  
L. Carletti ◽  
P. Ma ◽  
Y. Yu ◽  
B. Luther-Davies ◽  
D. Hudson ◽  
...  
Keyword(s):  
Silicon Germanium ◽  
Nonlinear Optical ◽  
Optical Response ◽  
Nonlinear Optical Response ◽  
Low Loss ◽  
Mid Infrared

Relationship of the drying process of a corn grain with the thermal emissivity and optical interference in the mid infrared range

2017 ◽  
Vol 56 (12) ◽  
pp. 3470
Author(s):  
Carlos Villaseñor-Mora ◽  
Francisco J. Gantes-Nunez ◽  
Arturo Gonzalez-Vega ◽  
Victor H. Hernandez-Gonzalez
Keyword(s):  
Infrared Range ◽  
Drying Process ◽  
Optical Interference ◽  
Mid Infrared ◽  
Thermal Emissivity ◽  
Relationship Of ◽  
Corn Grain

scholarly journals First detection of ozone in the mid-infrared at Mars: implications for methane detection

2020 ◽  
Vol 639 ◽  
pp. A141 ◽  
Author(s):  
K. S. Olsen ◽  
F. Lefèvre ◽  
F. Montmessin ◽  
A. Trokhimovskiy ◽  
L. Baggio ◽  
...  
Keyword(s):  
Atmospheric Chemistry ◽  
Polar Vortex ◽  
Trace Gas ◽  
Spectral Signature ◽  
Infrared Range ◽  
Mid Infrared ◽  
Northern Latitudes ◽  
Ultraviolet Range ◽  
Vibration Rotation ◽  
Methane Detection

Aims. The ExoMars Trace Gas Orbiter was sent to Mars in March 2016 to search for trace gases diagnostic of active geological or biogenic processes. Methods. We report the first observation of the spectral features of Martian ozone (O3) in the mid-infrared range using the Atmospheric Chemistry Suite Mid-InfaRed (MIR) channel, a cross-dispersion spectrometer operating in solar occultation mode with the finest spectral resolution of any remote sensing mission to Mars. Results. Observations of ozone were made at high northern latitudes (>65°N) prior to the onset of the 2018 global dust storm (Ls = 163–193°). During this fast transition phase between summer and winter ozone distribution, the O3 volume mixing ratio observed is 100–200 ppbv near 20 km. These amounts are consistent with past observations made at the edge of the southern polar vortex in the ultraviolet range. The observed spectral signature of ozone at 3000–3060 cm−1 directly overlaps with the spectral range of the methane (CH4) ν3 vibration-rotation band, and it, along with a newly discovered CO2 band in the same region, may interfere with measurements of methane abundance.

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