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Browsing by Author "Shao, Qian"
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Item Flexible polydimethylsiloxane/multi-walled carbon nanotubes membranous metacomposites with negative permittivity(Elsevier, 2017-09) Sun, Kai; Xie, Peitao; Wang, Zhongyang; Su, Tongming; Shao, Qian; Ryu, JongEun; Zhang, Xihua; Guo, Jiang; Shankar, Akash; Li, Jianfeng; Fan, Runhua; Cao, Dapeng; Guo, Zhanhu; Department of Mechanical Engineering, School of Engineering and TechnologyMetacomposites with negative electromagnetic parameters can be promising substitute for periodic metamaterials. In this paper, we devoted to fabricating flexible metacomposite films, which have great potential applications in the field of wearable cloaks, sensing, perfect absorption and stretchable electronic devices. The conductivity and the complex permittivity were investigated in flexible polydimethylsiloxane (PDMS)/multi-walled carbon nanotubes (MWCNTs) membranous nanocomposites, which were fabricated via in-situ polymerization process. With the increase of conductive one-dimension carbon nanotubes concentration, there was a percolation transition observed in conduction due to the formation of continuous networks. The dielectric dispersion behavior was also analyzed in the spectra of complex permittivity. It is indicated that the conduction and polarization make a combined effect on the dielectric loss in flexible PDMS/MWCNTs composites. The negative permittivity with a dielectric resonance was obtained, and was attributed to the induced electric dipoles.Item Poly(sulfur-random-(1,3-diisopropenylbenzene)) Based Mid-Wavelength Infrared Polarizer: Optical Property Experimental and Theoretical Analysis(Elsevier, 2019-08) Berndt, Aaron J.; Hwang, Jehwan; Islam, Md Didarul; Sihn, Amy; Urbas, Augustine M.; Ku, Zahyun; Lee, Sang J.; Czaplewski, David A.; Dong, Mengyao; Shao, Qian; Wu, Shide; Guo, Zhanhu; Ryu, Jong E.; Mechanical and Energy Engineering, School of Engineering and TechnologyDevelopment of polymer based mid-wavelength infrared (MWIR) optics has been limited mainly due to high optical loss of organic polymers used in general optical components. In this study, a MWIR polarization grating based on a sulfuric polymer poly(sulfur-random-(1,3-diisopropenylbenzene)) with a low loss in the MWIR range was fabricated using a simple two-step process: imprint and metal deposition. Fourier-transform infrared (FTIR) spectroscopy measurement showed that this polymeric MWIR polarizer selectively transmitted the polarized IR in transverse magnetic (TM) mode over the transverse electric (TE) mode at normal incidence. The measured extinction ratios ( = The ratio of transmissions in TM and TE) were 208, 176, and 212 at the wavelength of 3, 4, and 5 μm, respectively. The computational simulation and analytical model confirmed that the enhanced TM transmission efficiency and followed a Fabry-Pérot (FP) resonance mode within the created sulfuric polymer film. This polymeric MWIR polarizer demonstrated a great potential for broader applications in IR photonics to realize low-cost and durable optical components.