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24 results on '"Shan, Xiaonan"'

2. Graphene Induced Large Shift of Surface Plasmon Resonances of Gold Films: Effective Medium Theory for Atomically Thin Materials

Author

Alam, Md Kamrul, Niu, Chao, Wang, Yanan, Wang, Wei, Li, Yang, Dai, Chong, Tong, Tian, Shan, Xiaonan, Charlson, Earl, Pei, Steven, Kong, Xiang-Tian, Hu, Yandi, Belyanin, Alexey, Stein, Gila, Liu, Zhaoping, Hu, Jonathan, Wang, Zhiming, and Bao, Jiming

Subjects
Physics - Optics, Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

Despite successful modeling of graphene as a 0.34-nm thick optical film synthesized by exfoliation or chemical vapor deposition (CVD), graphene induced shift of surface plasmon resonance (SPR) of gold films has remained controversial. Here we report the resolution of this controversy by developing a clean CVD graphene transfer method and extending Maxwell-Garnet effective medium theory (EMT) to 2D materials. A SPR shift of 0.24 is obtained and it agrees well with 2D EMT in which wrinkled graphene is treated as a 3-nm graphene/air layered composite, in agreement with the average roughness measured by atomic force microscope. Because the anisotropic built-in boundary condition of 2D EMT is compatible with graphene's optical anisotropy, graphene can be modelled as a film thicker than 0.34-nm without changing its optical property; however, its actual roughness, i.e., effective thickness will significantly alter its response to strong out-of-plane fields, leading to a larger SPR shift., Comment: 18 pages, 5 figures

Published
2019
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17. Large graphene-induced shift of surface-plasmon resonances of gold films: Effective-medium theory for atomically thin materials

Author

Alam, Md Kamrul, primary, Niu, Chao, additional, Wang, Yanan, additional, Wang, Wei, additional, Li, Yang, additional, Dai, Chong, additional, Tong, Tian, additional, Shan, Xiaonan, additional, Charlson, Earl, additional, Pei, Steven, additional, Kong, Xiang-Tian, additional, Hu, Yandi, additional, Belyanin, Alexey, additional, Stein, Gila, additional, Liu, Zhaoping, additional, Hu, Jonathan, additional, Wang, Zhiming, additional, and Bao, Jiming, additional

Published
2020
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18. A wavelength-resolved ratiometric photoelectrochemical technique: design and sensing applications† †Electronic supplementary information (ESI) available: Supplementary figures. See DOI: 10.1039/c5sc03336e Click here for additional data file

Author

Hao, Qing, Shan, Xiaonan, Lei, Jianping, Zang, Yang, Yang, Qianhui, and Ju, Huangxian

Subjects
Chemistry
Abstract

A wavelength-resolved ratiometric photoelectrochemical technique was developed as a novel concept for designing ratiometric photoelectrochemical sensors., In this work, a wavelength-resolved ratiometric photoelectrochemical (WR-PEC) technique was investigated and employed to construct a new type of PEC sensor with good sensitivity and anti-interference ability. The WR-PEC hybrid photoelectrodes were stepwise assembled using semiconductor quantum dots (QDs) and photoactive dyes. Under continuous irradiation, the photocurrent–wavelength (I–λ) curves reveal the dependence of the photocurrent on the wavelength. By monitoring the ratios of the two different PEC peak values, a wavelength-resolved ratiometric strategy was realized. Using CdS QDs and methylene blue (MB) as photoactive models, a dual-anodic WR-PEC sensor was established for sensitive detection of Cu2+. This ratiometric strategy was identified to be based on the quenching effect of Cu2+ towards CdS QDs and enhancement of the MB photocurrent through catalytic oxidation of leuco-MB. Under continuous illumination from 400 nm to 800 nm at a 0.1 V bias potential, a WR-PEC sensor for Cu2+ was developed with a wide linear range and a detection limit of 0.37 nM. This WR-PEC had a greatly improved anti-interference ability in a complex environment, and showed acceptable stability. Moreover, using the CdS/magnesium phthalocyanine (MgPc) and CdTe/MgPc as photoelectrodes, anodic–cathodic and dual-cathodic WR-PEC sensors were established, respectively. The WR-PEC technique could serve as a novel concept for designing ratiometric or multi-channel PEC sensors.

Published
2015

24. Gain-coupled distributed feedback laser based on periodic surface anode canals

Author

Chen, Yongyi, Jia, Peng, Zhang, Jian, Qin, Li, Chen, Hong, Gao, Feng, Zhang, Xing, Shan, Xiaonan, Ning, Yongqiang, and Wang, Lijun

Abstract

A single-longitude-mode, broad-stripe, gain-coupled, distributed-feedback laser based on periodic surface anode canals (PSACs) is demonstrated. The PSACs, produced by i-line lithography, enhance the contrast of periodic current density in the active layer without introducing effective photon coupling; calculated grating κL is only 0.026. Power of 144.6 mW at 968.8 nm, with spectrum linewidth less than 0.04 nm on every uncoated cleavage facet, is obtained at a current of 1.2 A with a side-mode suppression ratio >29  dB.

Published
2015

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