Search

Your search keyword '"Turpin, Jeremiah P."' showing total 47 results
Start Over Author "Turpin, Jeremiah P."
47 results on '"Turpin, Jeremiah P."'

7. Reconfigurable and Tunable Metamaterials: A Review of the Theory and Applications

Author

Turpin, Jeremiah P., Bossard, Jeremy A., Morgan, Kenneth L., Werner, Douglas H., and Werner, Pingjuan L.

Subjects
Article Subject, Physics::Optics, Physics::Classical Physics
Abstract

Metamaterials are being applied to the development and construction of many new devices throughout the electromagnetic spectrum. Limitations posed by the metamaterial operational bandwidth and losses can be effectively mitigated through the incorporation of tunable elements into the metamaterial devices. There are a wide range of approaches that have been advanced in the literature for adding reconfiguration to metamaterial devices all the way from the RF through the optical regimes, but some techniques are useful only for certain wavelength bands. A range of tuning techniques span from active circuit elements introduced into the resonant conductive metamaterial geometries to constituent materials that change electromagnetic properties under specific environmental stimuli. This paper presents a survey of the development of reconfigurable and tunable metamaterial technology as well as of the applications where such capabilities are valuable.

Published
2014
Full Text
View/download PDF

46. Body-of-revolution finite-difference time-domain for rigorous analysis of three-dimensional axisymmetric transformation optics lenses

Author

Wang, Xiande, Wu, Qi, Turpin, Jeremiah P., and Werner, Douglas H.

Abstract

A body-of-revolution finite-difference time-domain (BOR-FDTD) method was developed and employed to rigorously analyze axisymmetric transformation optics (TO) lenses. The novelty of the proposed BOR-FDTD technique is that analytical expressions were derived and presented to introduce obliquely incident plane waves into the total-field/scattered-field formulation, allowing for accurate simulation of BOR objects in layered media illuminated by obliquely incident waves. The accuracy of the proposed method was verified by comparing numerical results with analytical solutions. The developed code was further utilized to study the imaging properties of a cylindrical TO Luneburg lens on a substrate, demonstrating the desired focusing of light onto a flat plane.

Published
2013

47. Conformal mappings to achieve simple material parameters for transformation optics devices.

Author

Turpin JP, Massoud AT, Jiang ZH, Werner PL, and Werner DH

Subjects
Computer Simulation, Computer-Aided Design, Equipment Design, Equipment Failure Analysis, Light, Scattering, Radiation, Manufactured Materials, Models, Theoretical, Optical Devices, Refractometry instrumentation, Transducers
Abstract

The transformation optics technique for designing novel electromagnetic and optical devices offers great control over wave behavior, but is difficult to implement primarily due to limitations in current metamaterial design and fabrication techniques. This paper demonstrates that restricting the spatial transformation to a conformal mapping can lead to much simpler material parameters for more practical implementation. As an example, a flat cylindrical-to-plane-wave conversion lens is presented and its performance validated through numerical simulations. It is shown that the lens dimensions and embedded source location can be adjusted to produce one, two, or four highly directive planar beams. Two metamaterial designs for this lens that implement the required effective medium parameters are proposed and their behavior analyzed.

Published
2010
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results