Shape reconstructions by using plasmon resonances

Abstract

We study the shape reconstruction of an inclusion from the faraway measurement of the associated electric field. This is an inverse problem of practical importance in biomedical imaging and is known to be notoriously ill-posed. By incorporating Drude’s model of the permittivity parameter, we propose a novel reconstruction scheme by using the plasmon resonance with a significantly enhanced resonant field. We conduct a delicate sensitivity analysis to establish a sharp relationship between the sensitivity of the reconstruction and the plasmon resonance. It is shown that when plasmon resonance occurs, the sensitivity functional blows up and hence ensures a more robust and effective construction. Then we combine the Tikhonov regularization with the Laplace approximation to solve the inverse problem, which is an organic hybridization of the deterministic and stochastic methods and can quickly calculate the minimizer while capture the uncertainty of the solution. We conduct extensive numerical experiments to illustrate the promising features of the proposed reconstruction scheme.

Elastodynamical resonances and cloaking of negative material structures beyond quasistatic approximation

“…6-8 and the references cited therein. Negative materials are revolutionizing many industrial applications, including antennas, 9 absorber, 10 invisibility cloaking , 2,11-15 superlens, 16,17 and super-resolution imaging, [18][19][20] to mention just a few. We are mainly concerned with the quantitative theoretical understandings of negative metamaterials, which have received considerable interest recently in the literature.…”

“…6–8 and the references cited therein. Negative materials are revolutionizing many industrial applications, including antennas, 9 absorber, 10 invisibility cloaking , 2,11–15 superlens, 16,17 and super‐resolution imaging, 18–20 to mention just a few.…”

Elastodynamical resonances and cloaking of negative material structures beyond quasistatic approximation

“…Negative materials are revolutionizing many industrial applications including antennas [10], absorber [28], invisibility cloaking [2,23,25,29,31], superlens [18,32] and super-resolution imaging [3,16], to mention just a few. We are mainly concerned with the quantitative theoretical understandings of negative metamaterials, which have received considerable interest recently in the literature.…”