Using fine-structured gratings to implement mid-infrared dual-band absorbers

2020 ◽  
Vol 91 (2) ◽  
pp. 20501
Author(s):  
Xin He ◽  
Jinliang Jie ◽  
Junbo Yang ◽  
Yunxin Han ◽  
Sen Zhang
Keyword(s):  
Surface Plasmon Polariton ◽  
Gold Film ◽  
Normal Incidence ◽  
Transverse Magnetic ◽  
Unit Cell ◽  
Dual Band ◽  
Physical Origin ◽  
Absorption Bands ◽  
Mid Infrared ◽  
Ir Frequencies

A dual narrowband absorber operating at mid-infrared (mid-IR) frequencies was numerically investigated. The structure consists of a fine-structured silicon grating on a gold film. Each unit cell of the fine-structured silicon grating is composed of two different silicon bars. When illuminated by a transverse-magnetic (TM) polarized plane wave, the absorber will create two absorption bands. At normal incidence, the two absorption bands have respective peak wavelengths of ∼3.864 µm and ∼3.994 µm, and respective bandwidths of ∼28 nm and ∼36 nm. The level of absorption can be higher than 0.998. It is shown that the two absorption bands are related to different silicon bars in each unit cell. Moreover, the physical origin of the two absorption bands is attributed to the different surface-plasmon-polariton (SPP) modes excited in the absorber.

scholarly journals A Dual-Band Terahertz Absorber with Two Passbands Based on Periodic Patterned Graphene

Materials ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 3016 ◽  
Author(s):  
Ximeng Zhang ◽  
Weiwei Wu ◽  
Chenxin Li ◽  
Chang Wang ◽  
Yuhong Ma ◽  
...  
Keyword(s):  
Chemical Potential ◽  
Transmission Rate ◽  
Frequency Selective Surface ◽  
Transverse Magnetic ◽  
Dual Band ◽  
Center Frequency ◽  
Absorption Bands ◽  
Terahertz Absorber ◽  
Potential Applications ◽  
Incident Waves

In this paper, a dual-band terahertz absorber with two passbands is proposed. The absorber is composed of periodic patterned graphene arrays on the top of a SiO 2 substrate and a frequency selective surface (FSS) on the bottom of the substrate. The simulated results indicate that there are two absorption bands (absorption greater than 90%) ranging from 0.54 to 0.84 THz and 2.13 to 2.29 THz. It is almost transparent to incident waves (transmission greater than 50%) below 0.19 THz and between 1.3 and 1.67 THz with a center frequency of 1.49 THz. The absorber has a good tolerance to the transverse electric (TE) and transverse magnetic (TM) polarized wave oblique incidence, and the transmission rate of the passbands remains greater than 50% within 70 degrees. Moreover, the absorption rate of the absorber can be tuned by the chemical potential of graphene. The structure with absorption and transmission properties has potential applications in filtering, sensing, detecting and antenna stealth.

scholarly journals Numerical Study of Angle-Insensitive and Tunable Dual-Band THz Absorber Using Periodic Cross-Shaped Graphene Arrays

Materials ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2063 ◽  
Author(s):  
Tian Sang ◽  
Jian Gao ◽  
La Wang ◽  
Honglong Qi ◽  
Xin Yin ◽  
...  
Keyword(s):  
Transverse Electric ◽  
Numerical Study ◽  
Transverse Magnetic ◽  
Dual Band ◽  
Absorption Enhancement ◽  
Cavity Model ◽  
Absorption Bands ◽  
Fabry Perot ◽  
Band Absorption ◽  
The Cross

A dual-band terahertz (THz) absorber using the periodic cross-shaped graphene arrays is presented. It is shown that the dual-band light absorption enhancement of graphene results from the edge graphene plasmon (EGP) resonance, and the locations of the two absorption peaks can be precisely estimated by using the Fabry-Pérot (F-P) cavity model. Slight residual reflection remains at the two absorption peaks because the input impedance of the cross-arm cannot be perfectly matched with the free space impedance. In addition, the locations of the two absorption bands can be simultaneously tuned by changing the Fermi level of graphene, and they can be independently tuned by changing the width or the length of the cross-arm of graphene. Excellent angle-insensitivity dual-band absorption enhancement of graphene can be maintained for both the transverse electric (TE) and transverse magnetic (TM) polarizations.

scholarly journals Tunable dual-band mid-infrared absorber based on the coupling of a graphene surface plasmon polariton and Tamm phonon-polariton

2021 ◽  
Vol 29 (10) ◽  
pp. 15228
Author(s):  
Jing Han ◽  
Yabin Shao ◽  
Chunyu Chen ◽  
Jun Wang ◽  
Yang Gao ◽  
...  
Keyword(s):  
Surface Plasmon ◽  
Surface Plasmon Polariton ◽  
Dual Band ◽  
Mid Infrared ◽  
Graphene Surface ◽  
Plasmon Polariton

Single-peak-regulation and wide-angle dual-band metamaterial absorber based on hollow-cross and solid-cross resonators

2020 ◽  
Vol 91 (3) ◽  
pp. 30901
Author(s):  
Yibo Tang ◽  
Longhui He ◽  
Jianming Xu ◽  
Hailang He ◽  
Yuhan Li ◽  
...  
Keyword(s):  
Transverse Electric ◽  
Surface Current ◽  
Dielectric Substrate ◽  
Transverse Magnetic ◽  
Metamaterial Absorber ◽  
Absorption Peak ◽  
Dual Band ◽  
Single Peak ◽  
Wide Angle ◽  
Surface Current Density

A dual-band microwave metamaterial absorber with single-peak regulation and wide-angle absorption has been proposed and illustrated. The designed metamaterial absorber is consisted of hollow-cross resonators, solid-cross resonators, dielectric substrate and metallic background plane. Strong absorption peak coefficients of 99.92% and 99.55% are achieved at 8.42 and 11.31 GHz, respectively, which is basically consistent with the experimental results. Surface current density and changing material properties are employed to illustrate the absorptive mechanism. More importantly, the proposed dual-band metamaterial absorber has the adjustable property of single absorption peak and could operate well at wide incidence angles for both transverse electric (TE) and transverse magnetic (TM) waves. Research results could provide and enrich instructive guidances for realizing a single-peak-regulation and wide-angle dual-band metamaterial absorber.

scholarly journals Graphene-based tunable hyperbolic microcavity

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.

Normal incidence detection of ultraviolet, visible, and mid-infrared radiation in a single GaAs/AlGaAs device

2009 ◽  
Vol 34 (13) ◽  
pp. 2036 ◽  
Author(s):  
G. Ariyawansa ◽  
P. V. V. Jayaweera ◽  
A. G. U. Perera ◽  
S. G. Matsik ◽  
M. Buchanan ◽  
...  
Keyword(s):  
Infrared Radiation ◽  
Normal Incidence ◽  
Mid Infrared

Ambient temperature-independent dual-band mid-infrared radiation thermometry

2016 ◽  
Vol 55 (9) ◽  
pp. 2169 ◽  
Author(s):  
You Lü ◽  
Xin He ◽  
Zhong-Hui Wei ◽  
Zhi-Yuan Sun ◽  
Song-Tao Chang
Keyword(s):  
Ambient Temperature ◽  
Infrared Radiation ◽  
Radiation Thermometry ◽  
Dual Band ◽  
Mid Infrared

Normal-Incidence p-Type Si/SiGe Mid-Infrared Detector with Background-Limited Performance up to 85 K

1998 ◽  
pp. 122-126
Author(s):  
Peter Kruck ◽  
Manfred Helm ◽  
Günther Bauer ◽  
Joachim F. Nützel ◽  
Gerhard Abstreiter
Keyword(s):  
Infrared Detector ◽  
Normal Incidence ◽  
Mid Infrared ◽  
P Type

scholarly journals Mathematical analogies in physics. Thin-layer wave theory

2014 ◽  
Vol 57 (1) ◽  
Author(s):  
José M. Carcione ◽  
Vivian Grünhut ◽  
Ana Osella
Keyword(s):  
Quantum Mechanics ◽  
Thin Layer ◽  
Quantum Physics ◽  
Constitutive Relations ◽  
Normal Incidence ◽  
Wave Theory ◽  
Transverse Magnetic ◽  
Momentum Conservation ◽  
Tunnel Effect ◽  
Basic Equations

<p>Field theory applies to elastodynamics, electromagnetism, quantum mechanics, gravitation and other similar fields of physics, where the basic equations describing the phenomenon are based on constitutive relations and balance equations. For instance, in elastodynamics, these are the stress-strain relations and the equations of momentum conservation (Euler-Newton law). In these cases, the same mathematical theory can be used, by establishing appropriate mathematical equivalences (or analogies) between material properties and field variables. For instance, the wave equation and the related mathematical developments can be used to describe anelastic and electromagnetic wave propagation, and are extensively used in quantum mechanics. In this work, we obtain the mathematical analogy for the reflection/refraction (transmission) problem of a thin layer embedded between dissimilar media, considering the presence of anisotropy and attenuation/viscosity in the viscoelastic case, conductivity in the electromagnetic case and a potential barrier in quantum physics (the tunnel effect). The analogy is mainly illustrated with geophysical examples of propagation of S (shear), P (compressional), TM (transverse-magnetic) and TE (transverse-electric) waves. The tunnel effect is obtained as a special case of viscoelastic waves at normal incidence.</p>

scholarly journals Electrically Tunable Broadband Terahertz Absorption with Hybrid-Patterned Graphene Metasurfaces

Nanomaterials ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 562 ◽  
Author(s):  
Longfang Ye ◽  
Xin Chen ◽  
Guoxiong Cai ◽  
Jinfeng Zhu ◽  
Na Liu ◽  
...  
Keyword(s):  
Incident Angle ◽  
Single Layer ◽  
Normal Incidence ◽  
Transverse Magnetic ◽  
Single Layer Graphene ◽  
Terahertz Waves ◽  
Broadband Absorption ◽  
Terahertz Sensing ◽  
Axisymmetric Configuration ◽  
Broadband Terahertz

We numerically demonstrate a broadband terahertz (THz) absorber that is based on a hybrid-patterned graphene metasurface with excellent properties of polarization insensitivity, wide-angle, and active tunability. Our design is made up of a single-layer graphene with periodically arranged hybrid square/disk/loop patterns on a multilayer structure. We find that broadband absorption with 90% terahertz absorbance and the fractional bandwidth of 84.5% from 1.38 THz to 3.4 THz can be achieved. Because of the axisymmetric configuration, the absorber demonstrates absolute polarization independence for both transverse electric (TE) and transverse magnetic (TM) polarized terahertz waves under normal incidence. We also show that a bandwidth of 60% absorbance still remains 2.7 THz, ranging from 1.3 THz to 4 THz, for a wide incident angle ranging from 0° to 60°. Finally, we find that by changing the graphene Fermi energy from 0.7 eV to 0 eV, the absorbance of the absorbers can be easily tuned from more than 90% to lower than 20%. The proposed absorber may have promising applications in terahertz sensing, detecting, imaging, and cloaking.

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