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

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 Dynamically Switchable Polarization-Independent Triple-Band Perfect Metamaterial Absorber Using a Phase-Change Material in the Mid-Infrared (MIR) Region

Micromachines ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 548
Author(s):  
Dongdong Xu ◽  
Fenping Cui ◽  
Gaige Zheng
Keyword(s):  
Phase Change ◽  
Resonant Cavity ◽  
Infrared Region ◽  
Metamaterial Absorber ◽  
Absorption Efficiency ◽  
Plasmon Mode ◽  
Mid Infrared ◽  
Reversible Phase ◽  
High Absorption ◽  
Triple Band

A tunable metamaterial absorber (MMA) by reversible phase transitions in a mid-infrared regime is theoretically investigated. The absorber is composed of a molybdenum (Mo)-germanium-antimony-tellurium (Ge2Sb2Te5, GST)-Mo nanodisk structure superimposed on the GST-Al2O3 (aluminum oxide)-Mo film. Studies have shown that the combination of the inlaid metal-medium dielectric waveguide mode and the resonant cavity mode and the excitation of the propagating surface plasmon mode are the main reasons for the formation of the triple-band high absorption. Additionally, through the reversible phase change, the transition from high absorption to high reflection in the mid-infrared region is realized. The symmetry of the absorber eliminates the polarization dependence, and the near unity absorption efficiency can be maintained by incidence angles up to 60°. The presented method will enhance the functionality of the absorber and has the potential for the applications that require active control over light absorption.

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.

Tunable doublet lens based on dielectric metasurface using phase-change material

2020 ◽  
Vol 34 (28) ◽  
pp. 2050313
Author(s):  
Xingyi Li ◽  
Siqi Li ◽  
Guoxi Wang ◽  
Yufang Lei ◽  
Yunfan Hong ◽  
...  
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Focal Length ◽  
Infrared Region ◽  
Optical Components ◽  
Mid Infrared ◽  
Infrared Wavelength ◽  
Active Devices ◽  
Coupling System ◽  
Wide Range

Metasurfaces have recently emerged to realize flat optical components with various functions and providing potential capabilities in manufacturing active devices. In this paper, a doublet lens for mid-infrared wavelength with tunable focal length has been proposed. The designed metalens consists of two dielectric metalenses with different focal lengths patterned on a phase-change materials Ge2Sb1Te4. The doublet lens is proved to have above 13% change in the focal length with the crystalline states shifting of the Ge2Sb1Te4. And the designed doublet lens can be operated in mid-infrared region from 2.41 [Formula: see text]m to 2.60 [Formula: see text]m. In addition, chromatic calibration can be achieved by adjusting the crystalline phases of the Ge2Sb1Te4. This compatible metalens promises potential for a wide range of applications in MIR region such as multi-spectrum imaging, optical coupling system and micrography.

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

scholarly journals Combining Switchable Phase‐Change Materials and Phase‐Transition Materials for Thermally Regulated Smart Mid‐Infrared Modulators

2021 ◽  
pp. 2100417
Author(s):  
Xinrui Lyu ◽  
Andreas Heßler ◽  
Xiao Wang ◽  
Yunzhen Cao ◽  
Lixin Song ◽  
...  
Keyword(s):  
Phase Transition ◽  
Phase Change ◽  
Phase Change Materials ◽  
Mid Infrared
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