Synthesis and Infrared Multi‐band Absorption Properties of Core‐shell NaYF 4 :Yb 3+ , Er 3+ @SiO 2 Nanoparticles

2019 ◽  
Vol 645 (21) ◽  
pp. 1240-1246
Author(s):  
Lu Yuan ◽  
Ming Kang ◽  
Guanjun Chang ◽  
Xiangmeng Lv ◽  
Simin Shen ◽  
...  
Keyword(s):  
Core Shell ◽  
Absorption Properties ◽  
Band Absorption ◽  
Multi Band

scholarly journals Numerical Study on the Absorption Characteristics of Subwavelength Metallic Gratings Covered with a Lossy Dielectric Layer

2018 ◽  
Vol 8 (9) ◽  
pp. 1445
Author(s):  
Chi-Young Hwang ◽  
Yong-Hae Kim ◽  
Ji Choi ◽  
Gi Kim ◽  
Jong-Heon Yang ◽  
...  
Keyword(s):  
Dielectric Layer ◽  
Numerical Study ◽  
Structural Parameters ◽  
Resonant Cavity ◽  
Visible Range ◽  
Absorption Properties ◽  
Perfect Absorption ◽  
Metallic Gratings ◽  
Band Absorption ◽  
Multi Band

Optical absorbers have been a topic of intense research due to their importance in many applications. In particular, multi-band and perfect absorption features in a desired frequency range are essential in broadband applications. In this work, we numerically studied the absorption properties of subwavelength metallic gratings coated with a dielectric layer. Here, the structure is considered to be an integration between a resonant cavity and a subwavelength metallic grating. Two appropriately designed structures can exhibit multi-band absorption properties. In addition to the numerical simulation results, we elaborate on determining the appropriate structural parameters that yield the desired spectral absorption profile in the visible range. We also numerically identify critical coupling conditions for perfect absorption.

scholarly journals Quantum funneling in blended multi-band gap core/shell colloidal quantum dot solar cells

2015 ◽  
Vol 107 (10) ◽  
pp. 103902 ◽  
Author(s):  
Darren C. J. Neo ◽  
Samuel D. Stranks ◽  
Giles E. Eperon ◽  
Henry J. Snaith ◽  
Hazel E. Assender ◽  
...  
Keyword(s):  
Solar Cells ◽  
Quantum Dot ◽  
Band Gap ◽  
Core Shell ◽  
Quantum Dot Solar Cells ◽  
Colloidal Quantum Dot ◽  
Multi Band

scholarly journals Quad-Band Plasmonic Perfect Absorber for Visible Light with a Patchwork of Silicon Nanorod Resonators

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 1954 ◽  
Author(s):  
Can Cao ◽  
Yongzhi Cheng
Keyword(s):  
Visible Light ◽  
Transverse Electric ◽  
Transverse Magnetic ◽  
Localized Surface Plasmon ◽  
Perfect Absorber ◽  
Absorption Properties ◽  
Perfect Absorption ◽  
Potential Applications ◽  
Polarization Insensitive ◽  
Band Absorption

In this paper, a plasmonic perfect absorber (PPA) based on a silicon nanorod resonator (SNRR) for visible light is proposed and investigated numerically. The proposed PPA is only a two-layer nanostructure consisting of a SNRR periodic array and metal substrate. The perfect absorption mainly originates from excitation of the localized surface plasmon resonance (LSPR) mode in the SNRR structure. The absorption properties of this design can be adjusted by varying the radius (r) and height (h) of the SNRR structure. What is more, the stronger quad-band absorption can be achieved by combing four different radius of the SNRR in one period as a super unit-cell. Numerical simulation indicates that the designed quad-band PPA can achieve the absorbance of 99.99%, 99.8%, 99.8%, and 92.2% at 433.5 THz, 456 THz, 482 THz, and 504.5 THz, respectively. Further simulations show that the proposed PPA is polarization-insensitive for both transverse electric (TE) and transverse magnetic (TM) modes. The proposed PPA can be a desirable candidate for some potential applications in detecting, sensing, and visible spectroscopy.

Magnetic and microwave absorption properties of self-assemblies composed of core–shell cobalt–cobalt oxide nanocrystals

2015 ◽  
Vol 17 (5) ◽  
pp. 3796-3801 ◽  
Author(s):  
Zhongzhu Wang ◽  
Hong Bi ◽  
Peihong Wang ◽  
Min Wang ◽  
Zhiwei Liu ◽  
...  
Keyword(s):  
Cobalt Oxide ◽  
Microwave Absorption ◽  
Core Shell ◽  
Absorption Properties ◽  
Simple Method ◽  
Microwave Absorption Properties

We adopt a simple method to synthesize core–shell cobalt–cobalt oxide nanocrystals, presenting the enhanced microwave absorption properties.

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