Biomedical subjects

Peter Loschialpo

Publications and source records attributed to Peter Loschialpo.

4 recordsLinked to original sources

PubMed2006

Bandpass left-handed material optical filter with enhanced stop band rejection.

It is shown that a layer of left-handed media can act as a bandpass filter with a roll factor that far exceeds those of state-of-the-art spectral filters. The conditions for enhanced stop band rejection are presented and are deemed feasible, as the models used correspond to physically realizable materials. Roll factors of the order of 10(4)-10(6) dB/GHz are found, together with acceptable insertion losses of the order of 10 dB.

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PubMed2006

Exact solution to plane-wave scattering by an ideal "left-handed" wedge.

An exact analytical solution to the problem of plane-wave diffraction by a penetrable left-handed medium (LHM) epsilon = micro = -1 wedge of arbitrary angle (subject to valid physical constraints) is presented. Standard analysis involving discontinuous angular eigenfunctions and even/odd symmetry decomposition resulted in a discrete spectrum leading to a series solution resembling the traditional perfect electric conductor wedge solution but exhibiting the expected negative refraction phenomenology. Numerical results are presented, some of which seemed paradoxical but are explainable by classical means. A new type of illusory edge radiation is observed and explained. Also, a novel edge-launched interface standing wave is observed on the directly illuminated side. The exact analytical solution is verified by comparison with finite-difference time-domain simulation on causal LHM materials.

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PubMed2005

Exact solution to line source scattering by an ideal left-handed wedge.

A wedge or prism is a common geometry used in experiments involving left-handed media (LHM). It is shown that an exact analytical solution to the canonical problem of scattering by a LHM wedge or prism is feasible in the limit of no losses. The solution reproduces the ideal point image announced by Pendry which has not been observed experimentally. The analysis also results in the introduction of a new kind of resonator or photon localization device.

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PubMed2004

Two theorems on electromagnetic bistatic scattering.

For an axially incident plane wave, two theorems are stated in which sufficient conditions are imposed on the constitutive parameters epsilon and mu of a three-dimensional scatterer to ensure the identity of scattering patterns in orthogonal planes, both near and far zone, such as E and H planes. The theorems represent an extension of existing scattering theorems that apply to bodies of revolution. The theorems are proven analytically, and the results are validated through detailed finite-difference-time-domain and method-of-moments computer simulations on a few noncanonical complex shapes characterized by quite general causal permittivity epsilon and permeability mu functions. The selected materials have Lorentzian functional forms and encompass ordinary materials as well as left-handed materials as special cases.

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