Tunable and multi-channel perfect absorber based on graphene at mid-infrared region

2018 ◽  
Vol 11 (5) ◽  
pp. 052002 ◽  
Author(s):  
HaiYu Meng ◽  
XiongXiong Xue ◽  
Qi Lin ◽  
GuiDong Liu ◽  
Xiang Zhai ◽  
...  
Keyword(s):  
Infrared Region ◽  
Perfect Absorber ◽  
Mid Infrared

Tunable Nearly Perfect Absorber Based on Graphene Metamaterials at the Mid-Infrared Region

Plasmonics ◽  
2017 ◽  
Vol 13 (3) ◽  
pp. 1043-1048 ◽  
Author(s):  
Li-Ping Sun ◽  
Xiang Zhai ◽  
Qi Lin ◽  
Gui-Dong Liu ◽  
Ling-Ling Wang
Keyword(s):  
Infrared Region ◽  
Perfect Absorber ◽  
Mid Infrared

scholarly journals Ultrathin and Electrically Tunable Metamaterial with Nearly Perfect Absorption in Mid-Infrared

2019 ◽  
Vol 9 (16) ◽  
pp. 3358 ◽  
Author(s):  
Yuexin Zou ◽  
Jun Cao ◽  
Xue Gong ◽  
Ruijie Qian ◽  
Zhenghua An
Keyword(s):  
Resonant Mode ◽  
Infrared Region ◽  
Perfect Absorber ◽  
Geometrical Structures ◽  
Material Loss ◽  
Absorption Region ◽  
Perfect Absorption ◽  
Mid Infrared ◽  
Wide Range ◽  
Metal Insulator Metal

Metamaterials integrated with graphene exhibit tremendous freedom in tailoring their optical properties, particularly in the infrared region, and are desired for a wide range of applications, such as thermal imaging, cloaking, and biosensing. In this article, we numerically and experimentally demonstrate an ultrathin (total thickness < λ 0 / 15 ) and electrically tunable mid-infrared perfect absorber based on metal–insulator–metal (MIM) structured metamaterials. The Q-values of the absorber can be tuned through two rather independent parameters, with geometrical structures of metamaterials tuning radiation loss (Qr) of the system and the material loss (tanδ) to further change mainly the intrinsic loss (Qa). This concise mapping of the structural and material properties to resonant mode loss channels enables a two-stage optimization for real applications: geometrical design before fabrication and then electrical tuning as a post-fabrication and fine adjustment knob. As an example, our device demonstrates an electrical and on-site tuning of ~5 dB change in absorption near the perfect absorption region. Our work provides a general guideline for designing and realizing tunable infrared devices and may expand the applications of perfect absorbers for mid-infrared sensors, absorbers, and detectors in extreme spatial-limited circumstances.

scholarly journals Tunable phase change polaritonic perfect absorber in the mid-infrared region

2020 ◽  
Vol 28 (8) ◽  
pp. 11721 ◽  
Author(s):  
Chuanyan Peng ◽  
Kai Ou ◽  
Guanhai Li ◽  
Xiaoyan Li ◽  
Wenjuan Wang ◽  
...  
Keyword(s):  
Phase Change ◽  
Infrared Region ◽  
Perfect Absorber ◽  
Mid Infrared

Mid and near Infrared Study of Carbohydrates by Canonical Correlation Analysis

1993 ◽  
Vol 1 (2) ◽  
pp. 99-108 ◽  
Author(s):  
P. Robert ◽  
M.F. Devaux ◽  
A. Qannari ◽  
M. Safar
Keyword(s):  
Correlation Analysis ◽  
Infrared Spectra ◽  
Canonical Correlation ◽  
Near Infrared ◽  
Sugar Content ◽  
Infrared Region ◽  
Total Sugar ◽  
Mid Infrared ◽  
Total Sugar Content ◽  
Near Infrared Spectra

Multivariate data treatments were applied to mid and near infrared spectra of glucose, fructose and sucrose solutions in order to specify near infrared frequencies that characterise each carbohydrate. As a first step, the mid and near infrared regions were separately studied by performing Principal Component Analyses. While glucose, fructose and sucrose could be clearly identified on the similarity maps derived from the mid infrared spectra, only the total sugar content of the solutions was observed when using the near infrared region. Characteristic wavelengths of the total sugar content were found at 2118, 2270 and 2324 nm. In a second step, the mid and near infrared regions were jointly studied by a Canonical Correlation Analysis. As the assignments of frequencies are generally well known in the mid infrared region, it should be useful to study the relationships between the two infrared regions. Thus, the canonical patterns obtained from the near infrared spectra revealed wavelengths that characterised each carbohydrate. The OH and CH combination bands were observed at: 2088 and 2332 nm for glucose, 2134 and 2252 nm for fructose, 2058 and 2278 nm for sucrose. Although a precise assignment of the near infrared bands to chemical groups within the molecules was not possible, the present work showed that near infrared spectra of carbohydrates presented specific features.

Ortho-deuterium Raman laser using the S/sub 0/(2) rotational transition in the mid-infrared region

1997 ◽  
Vol 33 (12) ◽  
pp. 2174-2177 ◽  
Author(s):  
T. Takasaki ◽  
A. Suda ◽  
K. Sato ◽  
T. Shinozaki ◽  
K. Nagasaka ◽  
...  
Keyword(s):  
Raman Laser ◽  
Infrared Region ◽  
Rotational Transition ◽  
Mid Infrared

Microstructure and thermal stability of amorphous materials in the GeS2−La2S3 system

1991 ◽  
Vol 6 (12) ◽  
pp. 2694-2700 ◽  
Author(s):  
Prashant N. Kumta ◽  
Subhash H. Risbud
Keyword(s):  
Thermal Stability ◽  
Amorphous Materials ◽  
Fiber Optic ◽  
Molecular Level ◽  
Infrared Region ◽  
Mid Infrared ◽  
Heat Treated ◽  
Stable Glasses ◽  
Microstructural Studies ◽  
Thermal Stability Of

GeS2 is known to be a good chalcogenide glass former with a transmission cutoff at 11 μm and has been studied for fiber optic application in the mid infrared region. The rare earth sulfides, oxysulfides, and oxides (La–Er) form reasonably good and stable glasses when mixed with chalcogenides such as Ga2S3. In this work, glass formation was studied in the GeS2−La2S3 system. Two compositions containing 60 mol % and 92.5 mol % GeS2, respectively, were analyzed, and the effects of composition on the microstructure and thermal stability of these glasses were investigated. Microstructural studies were conducted on the as-prepared and heat-treated glasses using TEM and SEM/EDXA. Glasses rich in GeS2 exhibited primary (6–88 nm) and secondary (3–13 nm) phase separation at the molecular level. Differential thermal analysis performed on these glasses indicated glass transition temperatures (Tg) of 510 °C and 420 °C for the two compositions studied. The glasses were stable and the (Tg) was observed to decrease with increasing contents of GeS2 in these glasses.

Polarization-independent broadband achromatic metalens in the mid-infrared (3-5 μm) region

2021 ◽  
Author(s):  
Wenhui Xiong ◽  
Chenchen Sha ◽  
Jianping Ding
Keyword(s):  
Numerical Simulation ◽  
Infrared Imaging ◽  
Chromatic Aberration ◽  
Infrared Region ◽  
Mid Infrared ◽  
Light Manipulation ◽  
Wavefront Shaping ◽  
Polarization Independent

Abstract With superior capabilities for light manipulation and wavefront shaping, the metasurface recently has caught growing attention. However, the presence of chromatic aberration hinders metasurfaces, especially metalenses, from wider applications. Here, we design a polarization-independent broadband achromatic focusing metalens in the mid-infrared region, which covers continuous bands in 3-5 μm. Numerical simulation shows that different wavelengths can be focused to the same plane with a nearly diffraction-limited resolution, and can achieve an average focusing efficiency of nearly 70% in the whole bandwidth. We expect that our approach can underpin the development of integrated and mid-infrared imaging and detection.

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