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| 1 | Mimicking the gravitational effect with gradient index lenses in geometrical optics显示文摘General relativity establishes the equality between matter-energy density and the Riemann curvature of spacetime.Therefore,light or matter will be bent or trapped when passing near the massive celestial objects,and Newton’s second law fails to explain it. The gravitational effect is not only extensively studied in astronomy but also attracts a great deal of interest in the field of optics. People have mimicked black holes,Einstein’s ring,and other fascinating effects in diverse optical systems. Here,with a gradient index lens,in the geometrical optics regime,we mimic the Schwarzschild precession in the orbit of the star S2 near the Galactic Center massive black hole,which was recently first detected by European Southern Observatory. We also find other series of gradient index lenses that can be used to mimic the possible Reissner–Nordstr?m metric of Einstein’s field equation and dark matter particle motion. Light rays in such gradient lenses will be closed in some cases,while in other cases it would be trapped by the center or keep dancing around the center. Our work presents an efficient toy model to help investigate some complex celestial behaviors,which may require long period detection by using high-precision astronomical tools. The induced gradient lenses enlightened by the gravitational effect also enrich the family of absolute optical instruments for their selective closed trajectories. | WEN XIAO SICEN TAO HUANYANG CHEN | 2021 | Photonics Research2021，9，7： | 1 |
| 2 | Analysis on fat-soluble components of sinapis semina from different habitats by GC-MS显示文摘A simple and rapid gas chromatography/mass spectrometry(GC/MS)analysis method was developed for the determination of fat-soluble parts of sinapis semina.Four major compounds were chosen as marker compounds to evaluate the method.Various extraction techniques were evaluated and the greatest efficiency was observed with sonication extraction using diethyl ether.The method was valuated as follows:acceptable apparatus suitability was obtained by testing the resolutions,tailing factors and theoretical plate number of the marker compounds;the precision and reproducibility,expressed as relative standard deviation(RSD),fell within the prescribed limits.Eight samples of sinapis semina collected from markets in Xi'an were monitored by using the method.The fingerprints of those samples were analyzed by hierarchical cluster analysis(HCA)similarity analysis.The result indicated that the combination of fingerprint and HCA could be used to analyze sinapis semina from different habitats. | Cheng Peng Tao Zhang Gang Zhao Sicen Wang | 2013 | Journal of Pharmaceutical Analysis2013，3，6： | 1 |
| 3 | Anisotropic Fermat’s principle for controlling hyperbolic van der Waals polaritons显示文摘Transformation optics(TO)facilitates flexible designs of spatial modulation of optical materials via coordinate transformations,thus,enabling on-demand manipulations of electromagnetic waves.However,the application of TO theory in control of hyperbolic waves remains elusive due to the spatial metric signature transition from(+,+)to(−,+)of a two-dimensional hyperbolic geometry.Here,we proposed a distinct Pythagorean theorem,which leads to establishing an anisotropic Fermat’s principle.It helps to construct anisotropic geometries and is a powerful tool for manipulating hyperbolic waves at the nanoscale and polaritons.Making use of absolute instruments,the excellent collimating and focusing behaviors of naturally in-plane hyperbolic polaritons in van der Waals��α–MoO_(3)layers are demonstrated,which opens up a new way for polaritons manipulation. | SICEN TAO TAO HOU YALI ZENG GUANGWEI HU ZIXUN GE JUNKE LIAO SHAN ZHU TAN ZHANG CHENG-WEI QIU HUANYANG CHEN | 2022 | Photonics Research2022，10，10： | 0 |
| 4 | Effective extraction of fluoroquinolones from water using facile modified plant fibers显示文摘In this study,ecofriendly and economic carboxy-terminated plant fibers(PFs)were used as adsorbents for the effective in-syringe solid phase extraction(IS-SPE)of fluoroquinolone(FQ)residues from water.Based on the thermal esterification and etherification reaction of cellulose hydroxy with citric acid(CA)and sodium chloroacetate in aqueous solutions,carboxy groups grafted onto cotton,cattail,and corncob fibers were fabricated.Compared with carboxy-terminated corncob and cotton,CA-modified cattail with more carboxy groups showed excellent adsorption capacity for FQs.The modified cattail fibers were reproducible and reusable with relative standard deviations of 3.2%-4.2% within 10 cycles of adsorptiondesorption.A good extraction efficiency of 71.3%-80.9% was achieved after optimizing the extraction condition.Based on carboxylated cattail,IS-SPE coupled with ultra-performance liquid chromatography with a photodiode array detector was conducted to analyze FQs in environmental water samples.High sensitivity with limit of detections of 0.08-0.25 mg/L and good accuracy with recoveries of 83.8%-111.7% were obtained.Overall,the simple and environment-friendly modified waste PFs have potential applications in the effective extraction and detection of FQs in natural waters. | Nan Zhang Yan Gao Kangjia Sheng Wanghui Jing Xianliang Xu Tao Bao Sicen Wang | 2022 | Journal of Pharmaceutical Analysis2022，12，5： | 0 |
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