title: Optical Concentrators with Simple Layered Designs.
abstract: A microwave prototype of field concentrator was recently fabricated, based on the combination of transformation optics and Fabry-Pérot resonances. Perfect electric conductors used as design elements is however, impossible when the working frequencies go to infrared or optical frequencies. Here in this paper, we show that layered structure with alternating dielectrics of positive and negative permittivities can be used to design concentrators of similar function. A practical design with only two kinds of semiconductors is suggested. Theoretical analysis and numerical simulations are performed to verify the concentrating effect.
authors.affiliation: 1] College of Physics, Optoelectronics and Energy &Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, Jiangsu 215006, China [2] Department of Physics, Shiraz University, Shiraz 71454, Iran.
authors.forename: Mohammad Mehdi
authors.initials: MM
authors.lastname: Sadeghi
authors.affiliation: College of Physics, Optoelectronics and Energy &Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, Jiangsu 215006, China.
authors.forename: Lin
authors.initials: L
authors.lastname: Xu
authors.affiliation: Department of Physics, Shiraz University, Shiraz 71454, Iran.
authors.forename: Hamid
authors.initials: H
authors.lastname: Nadgaran
authors.affiliation: College of Physics, Optoelectronics and Energy &Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, Jiangsu 215006, China.
authors.forename: Huanyang
authors.initials: H
authors.lastname: Chen