Browsing by Subject "Double layers"
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Item Open Access Compact left-handed metamaterial based on double-layer planar metal strip arrays(Optical Society of America, 2006) Guven, K.; Çalışkan, Deniz; Özbay, EkmelThe existence of a left-handed transmission peak of a metamaterial consisting of double-layer planar metal strip arrays at 15 GHz is demonstrated. This design is very suitable to submicron scales required at communication wavelengths. © 2006 Optical Society of America.Item Open Access Drag effect in double-layer dipolar fermi gases(IOP, 2014) Tanatar, Bilal; Renklioğlu, Başak; Öktel, M. ÖzgürWe consider two parallel layers of two-dimensional spin-polarized dipolar Fermi gas without any tunneling between the layers. The effective interactions describing screening and correlation effects between the dipoles in a single layer (intra-layer) and across the layers (interlayer) are modeled within the Hubbard approximation. We calculate the rate of momentum transfer between the layers when the gas in one layer has a steady flow. The momentum transfer induces a steady flow in the second layer which is assumed initially at rest. This is the drag effect familiar from double-layer semiconductor and graphene structures. Our calculations show that the momentum relaxation time has temperature dependence similar to that in layers with charged particles which we think is related to the contributions from the collective modes of the system.Item Open Access Graded-host phosphorescent light-emitting diodes with high efficiency and reduced roll-off(A I P Publishing LLC, 2012) Liu, S. W.; Sun, X. W.; Demir, Hilmi VolkanWe demonstrated graded-host phosphorescent organic light-emitting diodes with high efficiency and reduced efficiency roll-off. The emissive layer of the graded host device consists of both electron and hole transport type hosts, 1,3,5-tris(N-phenylbenzimidazole-2-yl)benzene (TPBI) and 4,4-,4- tris(Ncarbazolyl) triphenylamine, respectively, with graded composition, and the phosphorescent red emitter bis(2-phenylquinoline) (acetylacetonate) iridium(III), which wasuniformly doped into the graded hostmatrix. The graded host device shows improved quantum efficiency and power efficiency with significantly reduced efficiency rolloff as compared to the unipolar-host and double layer heterojunction host devices.