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Oblique angle deposition and its applications in plasmonics
Yizhuo He, Junxue Fu, Yiping Zhao
Frontiers of Physics. 2014, 9 (1 ): 47-59.
https://doi.org/10.1007/s11467-013-0357-1
Plasmonics based on localized surface plasmon resonance (LSPR) has found many exciting applications recently. Those applications usually require a good morphological and structural control of metallic nanostructures. Oblique angle deposition (OAD) has been demonstrated as a powerful technique for various plasmonic applications due to its advantages in controlling the size, shape, and composition of metallic nanostructures. In this review, we focus on the fabrication of metallic nanostructures by OAD and their applications in plasmonics. After a brief introduction to OAD technique, recent progress of applying OAD in fabricating noble metallic nanostructures for LSPR sensing, surface-enhanced Raman scattering, surface-enhanced infrared absorption, metal-enhanced fluorescence, and metamaterials, and their corresponding properties are reviewed. The future requirements for OAD plasmonics applications are also discussed.
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Mysteries of Rik = 0: A novel paradigm in Einstein’s theory of gravitation
Ram Gopal Vishwakarma
Frontiers of Physics. 2014, 9 (1 ): 98-112.
https://doi.org/10.1007/s11467-013-0358-0
Despite a century-long effort, a proper energy-stress tensor of the gravitational field, could not have been discovered. Furthermore, it has been discovered recently that the standard formulation of the energy-stress tensor of matter, suffers from various inconsistencies and paradoxes, concluding that the tensor is not consistent with the geometric formulation of gravitation [Astrophys. Space Sci., 2009, 321: 151; Astrophys. Space Sci., 2012, 340: 373]. This perhaps hints that a consistent theory of gravitation should not have any bearing on the energy-stress tensor. It is shown here that the so-called “vacuum” field equations Rik= 0 do not represent an empty spacetime, and the energy, momenta and angular momenta of the gravitational and the matter fields are revealed through the geometry, without including any formulation thereof in the field equations. Though, this novel discovery appears baffling and orthogonal to the usual understanding, is consistent with the observations at all scales, without requiring the hypothetical dark matter, dark energy or inflation. Moreover, the resulting theory circumvents the long-standing problems of the standard cosmology, besides explaining some unexplained puzzles.
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Simultaneous analysis of three-dimensional percolation models
Xiao Xu, Junfeng Wang, Jian-Ping Lv, Youjin Deng
Frontiers of Physics. 2014, 9 (1 ): 113-119.
https://doi.org/10.1007/s11467-013-0403-z
We simulate the bond and site percolation models on several three-dimensional lattices, including the diamond, body-centered cubic, and face-centered cubic lattices. As on the simple-cubic lattice [ Phys. Rev. E, 2013, 87(5): 052107], it is observed that in comparison with dimensionless ratios based on cluster-size distribution, certain wrapping probabilities exhibit weaker finite-size corrections and are more sensitive to the deviation from percolation threshold pc , and thus provide a powerful means for determining pc . We analyze the numerical data of the wrapping probabilities simultaneously such that universal parameters are shared by the aforementioned models, and thus significantly improved estimates of pc are obtained.
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