Verification of Impedance Matching at the Surface of Left-handed Materials
نویسندگان
چکیده
Impedance matching at the surface of left-handed materials (LHM) is required for certain applications including a perfect lens. In this study, we present the experimental and theoretical verification of an impedance-matched LHM to free space. Reflection characteristics of both one-dimensional and two-dimensional LHM were investigated. The reflection was observed to be very low at a narrow frequency range. FDTD simulations and retrieval procedures were used to theoretically verify impedance matching. By varying the number of layers along the propagation direction, the ultralow reflection at specific frequencies was shown to be independent of the sample thickness. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2548–2552, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ mop.22003
منابع مشابه
Negative refraction through an impedance- matched left-handed metamaterial slab
We report the transmission and reflection characteristics of a two-dimensional (2D) left-handed metamaterial (LHM). A well-defined left-handed (LH) transmission band with a peak value of −9.9 dB is obtained at frequencies where both effective permittivity and permeability are negative. A very sharp dip −38 dB at the reflection spectrum due to impedance matching at the surface of a 2D LHM is obs...
متن کاملExperimental investigation of reflection characteristics of left-handed metamaterials in free space
The transmission and reflection characteristics are presented of a one-dimensional (1D) left-handed metamaterial (LHM) and its constituents, split ring resonator and thin wire arrays. A well-defined left-handed transmission band with a peak value of 27.2 dB is obtained at frequencies where effective permittivity and permeability are both negative. A sharp dip (234.5 dB) at the reflection spectr...
متن کاملAnalytical Investigation of TM Surface Waves in 1D Photonic Crystals Capped by a Self-Focusing Left-Handed Slab
In this paper, the localized TM surface waves of a nonlinear self-focusingleft-handed slab sandwiched between a uniform medium and a one-dimensionalphotonic crystal (1D PC) is analytically investigated. Our method is based on the firstintegral of the nonlinear Maxwell's equations. For the TM surface waves, the presenceof two electric field components makes the analysis difficult. Therefore, we ...
متن کاملSexual Dimorphism in Surface Anatomical Parameters of Human Cerebral Cortex in Different Lebes in Normal and Neurodegenerative Subjects: a Stereological and Macroscopical Study
Purpose: This study sought to determine sex differences in surface anatomical parameters (thickness and surface areas) of human cerebral cortex in different lobes of the left hemisphere in normal right-handed subjects and right-handed subjects suffering from Alzheimer and Parkinson's diseases. Materials and Methods: This cross-sectional descriptive study was performed on 72 normal human brains...
متن کاملSexual Dimorphism in Surface Anatomical Parameters of Parahippocampal Cortex in Normal Subjects and Those Suffering From Alzheimer and Parkinson's Diseases - a Stereologic and Macroscopic Study
Purpose: This study was designed to determine sex differences in the surface anatomical parameters (surface area and thickness) of the left parahippocampal cortex in healthy right - handed subjects and right - handed subjects suffering from Alzheimer and Parkinson's diseases. Materials and Methods: This cross-sectional descriptive study was performed on 72 normal human brains (38 males, 34 fem...
متن کامل