scholarly journals Ultra-broadband absorber from visible to near-infrared using plasmonic metamaterial

2018 ◽  
Vol 26 (5) ◽  
pp. 5686 ◽  
Author(s):  
Lei Lei ◽  
Shun Li ◽  
Haixuan Huang ◽  
Keyu Tao ◽  
Ping Xu
2015 ◽  
Vol 23 (7) ◽  
pp. 8910 ◽  
Author(s):  
Qing Zhang ◽  
Lihua Bai ◽  
Zhengyuan Bai ◽  
Pidong Hu ◽  
Chengpu Liu

2021 ◽  
Author(s):  
Ali Elrashidi

Abstract In this work, an ultra-thin plasmonic metamaterial nanostructure absorber is simulated using finite difference time domain method in the visible and near infrared regions. A metamaterial, metal-insulator-metal, of a periodic structure of titanium-silica cap mounted on a top of a silver substrate covered by glass substrate is introduced in this paper. The glass substrate is used to enhance the absorption bandwidth by 276%, from 510 nm to 1410 nm. An almost perfect absorber, over 90% of the incident light, has been obtained for wavelengths from 440 nm to 1850 nm which produces an absorption bandwidth of 1410 nm. The square base unit cell dimensions of the silver substrate and of the cap are simulated and found as 250 nm and 200 nm consequently. The effect of using different materials for the top of the cap and for the insulator are also tested. The considered materials are titanium, nickel, silver, aluminum, and gold; however, the insulators are silica, quartz, vanadium dioxide, methyl methacrylate, and aluminium dioxide. In addition, aluminium, silver, copper, and gold are then simulated as a substrate metal. The optimum structure, which produce the maximum absorber bandwidth, 1410 nm, with a higher absorption, over 90%, is Glass-Ti-SiO2-Ag. Finally, the absorption bandwidth is calculated using different polarization angle, from 100 to 700 with a step100.


2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Dasol Lee ◽  
Myeongcheol Go ◽  
Minkyung Kim ◽  
Junho Jang ◽  
Chungryong Choi ◽  
...  

AbstractBroadband perfect absorbers have been intensively researched for decades because of their near-perfect absorption optical property that can be applied to diverse applications. Unfortunately, achieving large-scale and heat-tolerant absorbers has been remained challenging work because of costly and time-consuming lithography methods and thermolability of materials, respectively. Here, we demonstrate a thermally robust titanium nitride broadband absorber with >95% absorption efficiency in the visible and near-infrared region (400–900 nm). A relatively large-scale (2.5 cm × 2.5 cm) absorber device is fabricated by using a fabrication technique of multiple-patterning colloidal lithography. The optical properties of the absorber are still maintained even after heating at the temperatures >600 ∘C. Such a large-scale, heat-tolerant, and broadband near-perfect absorber will provide further useful applications in solar thermophotovoltaics, stealth, and absorption controlling in high-temperature conditions.


2019 ◽  
Vol 11 (1) ◽  
pp. 68-71
Author(s):  
Wang Zhiwen ◽  
Yuan Wei ◽  
Guo Qianjian

Background: Nickel grating absorber has been studied and shows good absorption property in the visible band. In order to further improve the absorption performance, reflection should be reduced, and anti-reflection layer should be added upon or under the gratings. Method: In this paper, the dielectric layer is added between and upon the nickel gratings. Equivalent medium theory is used to analyze the role of dielectric layer on absorption mechanism of nickel gratings. photoresist is used to illustrate the possible practical usage of the proposed method. Results: Absorption efficiency of TM (transverse magnetic) and TE (transverse electric) polarization show growing trend with the increase of refractive index of the dielectric material. PMMA and TU7 are chosen as the dielectric material. The simulation results show that TM absorption reduced slightly in visible band, and improved by up to 86% in the near infrared region. TE absorption shows up to 79% improvement in the whole visible to near infrared waveband. Conclusion: Nickel grating based broadband absorber is analyzed in this paper. Dielectric layer is added upon the gratings, and act as the anti-reflection layer. The refractive index and layer thickness is analyzed by using equivalent medium theory. Dielectric material that has high refractive index is more desired. The designed nickel grating shows high absorption property from 450nm to 800nm for both TM and TE polarization.


2013 ◽  
Vol 38 (13) ◽  
pp. 2247 ◽  
Author(s):  
Xingxing Chen ◽  
Hanmo Gong ◽  
Shuowei Dai ◽  
Ding Zhao ◽  
Yuanqing Yang ◽  
...  

Author(s):  
Prathan Buranasiri ◽  
Suwan Plaipichit ◽  
Chokchai Puttharugsa ◽  
Surawut Wicharn

Nanoscale ◽  
2020 ◽  
Vol 12 (14) ◽  
pp. 7875-7887 ◽  
Author(s):  
Ying Lan ◽  
Xiaohui Zhu ◽  
Ming Tang ◽  
Yihan Wu ◽  
Jing Zhang ◽  
...  

A near-infrared (NIR) activated theranostic nanoplatform based on upconversion nanoparticles (UCNPs) is developed in order to overcome the hypoxia-associated resistance in photodynamic therapy by photo-release of NO upon NIR illumination.


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