Results 1 to 10 of about 615,299 (407)

Amphoteric refraction at the interface between isotropic and anisotropic media [PDF]

Optics Communication 254, 353 (2005)., 2006
It is found that the amphoteric refraction, i.e. the refraction can be either positive or negative depending on the incident angles, could occur at a planar interface associated with a uniaxially anisotropic positive index media (PIM) or an anisotropic negative index media (NIM).
Feise, Foteinopoulou, Garcia, Gomez-Santos, Grzegorczyk, Hailu Luo, Haiying Liu, Hooft, Houck, Hu, Jing Zhu, Lindel, Liu, Luo, Notomi, Pacheco, Parazzoli, Pendry, Pendry, Pendry, Pendry, Shelby, Smith, Smith, Smith, Smith, Smith, Valanju, Valanju, Veselago, Wei Hu, Williams, Xunong Yi, Yariv, Zhang   +34 more
arxiv   +4 more sources

A method for creating materials with a desired refraction coefficient [PDF]

, 2009
It is proposed to create materials with a desired refraction coefficient in a bounded domain $D\subset \R^3$ by embedding many small balls with constant refraction coefficients into a given material. The number of small balls per unit volume around every point $x\in D$, i.e., their density distribution, is calculated, as well as the constant refraction
Ramm, A. G.
arxiv   +10 more sources

Refraction of Electromagnetic Energy for Wave Packets Incident on a Negative Index Medium is Always Negative [PDF]

Phys. Rev. E 69, 026604 (2004), 2003
We analyze refraction of electromagnetic wave packets on passing from an isotropic positive to an isotropic negative refractive index medium. We definitively show that in all cases the energy is always refracted negatively. For localized wave packets, the group refraction is also always negative.
A.A. Houck, C.G. Parazzoli, D.R. Smith, D.R. Smith, J. B. Sokoloff, J. Pacheco, Jr., J.A. Kong, J.A. Kong, P.M. Valanju, P.M. Valanju, R.A. Shelby, S. Sridhar, V.G. Veselago, W. T. Lu   +13 more
arxiv   +3 more sources

Wave-vector and polarization dependence of conical refraction [PDF]

Opt. Express 21, 4503-4511 (2013), 2014
We experimentally address the wave-vector and polarization dependence of the internal conical refraction phenomenon by demonstrating that an input light beam of elliptical transverse profile refracts into two beams after passing along one of the optic axes of a biaxial crystal, i.e. it exhibits double refraction instead of refracting conically.
Kalkandjiev, T. K., Loiko, Yu. V., Mompart, J., Tomizawa, H., Turpin, A.   +4 more
arxiv   +3 more sources

A new mechanism for negative refraction and focusing using selective diffraction from surface corrugation [PDF]

Optics Express 15, 9166-9175 (2007)., 2007
Refraction at a smooth interface is accompanied by momentum transfer normal to the interface. We show that corrugating an initially smooth, totally reflecting, non-metallic interface provides a momentum kick parallel to the surface, which can be used to refract light negatively or positively. This new mechanism of negative refraction is demonstrated by
Banyal, R. K., Huang, Y. J., Lu, W. T., Perry, C. H., Sridhar, S., Vodo, P.   +5 more
arxiv   +3 more sources

Cycloplegic refraction is the gold standard for epidemiological studies

Acta Ophthalmologica, 2015
Many studies on children have shown that lack of cycloplegia is associated with slight overestimation of myopia and marked errors in estimates of the prevalence of emmetropia and hyperopia.
Ian G Morgan, Akbar Fotouhi, Andrzej Grzybowski   +2 more
exaly   +2 more sources

Negative refraction, gain and nonlinear effects in hyperbolic metamaterials

Optics Express, 2013
The negative refraction and evanescent-wave canalization effects supported by a layered metamaterial structure obtained by alternating dielectric and plasmonic layers is theoretically analyzed. By using a transmission-line analysis, we formulate a way to
Christos Argyropoulos, Nasim Mohammadi Estakhri, Francesco Monticone   +2 more
exaly   +2 more sources

Clinical analysis of functional optical zone after transepithelial photorefractive keratectomy in patients with different degrees of myopic astigmatism [PDF]

Guoji Yanke Zazhi, 2023
AIM: To evaluate the effect of preoperative degrees of myopic astigmatism and anterior corneal curvature on the functional optical zone(FOZ)after transepithelial photorefractive keratectomy(TransPRK).METHODS: Retrospective study was conducted on 78 ...
Hai-Bo Tan, Wei Zhang
doaj   +1 more source

Gate-tunable negative refraction of mid-infrared polaritons [PDF]

Science, 2022
Negative refraction provides a platform to manipulate mid-infrared and terahertz radiation for molecular sensing and thermal emission applications. However, its implementation based on metamaterials and plasmonic media presents challenges with optical ...
Hai Hu, Na Chen, Hanchao Teng, Renwen Yu, Mengfei Xue, Ke Chen, Yuchuan Xiao, Yu Qu, Debo Hu, Jianing Chen, Zhipei Sun, Peining Li, F. D. de Abajo, Qing Dai   +13 more
semanticscholar   +1 more source

Negative refraction in hyperbolic hetero-bicrystals [PDF]

Science, 2022
We visualized negative refraction of phonon polaritons, which occurs at the interface between two natural crystals. The polaritons—hybrids of infrared photons and lattice vibrations—form collimated rays that display negative refraction when passing ...
A. Sternbach, S. Moore, A. Rikhter, S. Zhang, R. Jing, Y. Shao, B. Kim, S. Xu, S. Liu, J. Edgar, Á. Rubio, C. Dean, J. Hone, M. Fogler, D. Basov   +14 more
semanticscholar   +1 more source