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Optical Review - Wavelength-tuning Fizeau interferometry has been widely used to measure and estimate the optical thickness of optical components. However, in multilayer interferometry, the... 相似文献
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InfluenceonTransmissionPropertiesofSolitonsbyStochasticVariationofSystemParametersandInteractionCHENMinghua;WENYangjin;YANGXi... 相似文献
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Kenichi Hibino Yangjin Kim Sangyu Lee Yohan Kondo Naohiko Sugita Mamoru Mitsuishi 《Optical Review》2012,19(4):247-253
The absolute optical thickness and the surface shape of a glass plate of 7-in. square and 3.1mm thick was simultaneously measured by three-surface interferometry using a wavelength tuning Fizeau interferometer. The wavelength of a tunable diode laser is scanned linearly from 632 to 642 nm, at which the initial and the final phases of the interference fringes for the surface shape and for the optical thickness were separated and measured by a tunable phase-shifting technique. The number of phase variations in the interference fringes during the scanning is counted by discrete Fourier analysis, in which systematic errors caused by a nonlinearity in the wavelength scanning is corrected by a correlation analysis between the observed and theoretical interference fringes. Experimental results demonstrate that the systematic errors in the measured value were 15 nm for the surface shape and 0.6 μm for the absolute optical thickness. 相似文献
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Seung Jun Yang Yangjin Lee Jin Hong Kim Hyuk Jin Kim Byoung Ki Choi Hu Young Jeong Kwanpyo Kim Jin Sik Choi Young Jun Chang 《Current Applied Physics》2019,19(3):273-278
Controlled and simple synthesis strategy of two-dimensional (2D) nanomaterials is critical for designing the related heterostructures with different geometries, which influence strain, electronic structures, light-interactions, and surface reactions. Here, we report a single-step growth method for wrinkled MoSe2 thin films on flat SiO2/Si substrates by using high-vacuum co-evaporation. Above the critical film thickness of 15–20?nm, the MoSe2 films start to form wrinkled structure with lateral periodicity of 7–10?μm, which significantly reduces light reflectance in the visible range. We demonstrate formation of the wrinkled pattern on the selective area either by etching the substrate surface or by depositing gold films. In addition, we observe switching of the microscopic growth mode from a layered stacking to a vertically aligned growth, which results in 2D-3D hybrid microstructures. Our single-step synthesis approach might be generalized to obtain wrinkled 2D-3D hybrid nanomaterials and utilized for flexible electronic & optoelectronic devices, efficient solar cells, catalytic electrodes, and anti-counterfeiting applications. 相似文献
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Shenhao Yuan Yanyun Wang Yiwei Zhang Wenyu Zhu Xushuai Lv Yangjin Wu Yuming Zhou Wenxia Chen 《应用有机金属化学》2019,33(2)
Graphitic carbon nitride (g‐C3N4)‐based photocatalysts have received considerable attention in the field of photocatalysis, especially for photocatalytic H2 evolution. However, the intrinsic disadvantages of g‐C3N4 seriously limit its practical application. Herein, CdS nanospheres with an average diameter of 135 nm prepared using a solvothermal method were used as co‐catalysts to form CdS/g‐C3N4 composites (CSCN) to enhance the photocatalytic activity. Various techniques were employed to characterize the structure, composition and optical properties of the as‐prepared samples. It was found that the CdS nanospheres were relatively uniformly dispersed on the surface of g‐C3N4. Moreover, the photocatalytic H2 generation activity of the samples was evaluated using lactic acid as sacrificial reagent in water under visible light irradiation. When the amount of CdS nanospheres loaded in the hybridized composites was 5 wt%, the optimal H2 evolution rate reached 924 μmol g?1 h?1, which was approximately 1.4 times higher than that (680 μmol g?1 h?1) of Pt/g‐C3N4 (3 wt%). Based on the results of analysis, a possible mechanism for the photocatalytic activity of CSCN is proposed tentatively. 相似文献
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Jun-Yeong Yoon Yangjin Lee Dong-Gyu Kim Dong Gun Oh Jin Kyun Kim Linshuo Guo Jungcheol Kim Jeongheon Choe Kihyun Lee Hyeonsik Cheong Chae Un Kim Young Jai Choi Yanhang Ma Kwanpyo Kim 《Angewandte Chemie (International ed. in English)》2023,62(36):e202307102
Elemental phosphorus exhibits fascinating structural varieties and versatile properties. The unique nature of phosphorus bonds can lead to the formation of extremely complex structures, and detailed structural information on some phosphorus polymorphs is yet to be investigated. In this study, we investigated an unidentified crystalline phase of phosphorus, type-II red phosphorus (RP), by combining state-of-the-art structural characterization techniques. Electron diffraction tomography, atomic-resolution scanning transmission electron microscopy (STEM), powder X-ray diffraction, and Raman spectroscopy were concurrently used to elucidate the hidden structural motifs and their packing in type-II RP. Electron diffraction tomography, performed using individual crystalline nanowires, was used to identify a triclinic unit cell with volume of 5330 Å3, which is the largest unit cell for elemental phosphorus crystals up to now and contains approximately 250 phosphorus atoms. Atomic-resolution STEM imaging, which was performed along different crystal-zone axes, confirmed that the twisted wavy tubular motif is the basic building block of type-II RP. Our study discovered and presented a new variation of building blocks in phosphorus, and it provides insights to clarify the complexities observed in phosphorus as well as other relevant systems. 相似文献
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