Time-Driven Superoscillations with Negative Refraction

被引：39

作者：

Dubois, M. ^{[1
]}

Bossy, E. ^{[1
]}

Enoch, S. ^{[2
]}

Guenneau, S. ^{[2
]}

Lerosey, G. ^{[1
]}

Sebbah, P. ^{[1
,3
]}

机构：

[1] ESPCI ParisTech, CNRS, UMR7587, Inst Langevin, F-75238 Paris 05, France

[2] Aix Marseille Univ, CNRS, Cent Marseille, Inst Fresnel,UMR 7249, F-13013 Marseille, France

[3] Bar Ilan Univ, Jack & Pearl Resnick Inst Adv Technol, Dept Phys, IL-5290002 Ramat Gan, Israel

来源：

PHYSICAL REVIEW LETTERS | 2015年 / 114卷 / 01期

关键词：

EVANESCENT WAVES; LENS; SUPERRESOLUTION; MICROSCOPE;

D O I：

10.1103/PhysRevLett.114.013902

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The flat-lens concept based on negative refraction proposed by Veselago in 1968 has been mostly investigated in the monochromatic regime. It was recently recognized that time development of the superlensing effect discovered in 2000 by Pendry is yet to be assessed and may spring surprises: Time-dependent illumination could improve the spatial resolution of the focusing. We investigate dynamics of flexural wave focusing by a 45 degrees-tilted square lattice of circular holes drilled in a duralumin plate. Time-resolved experiments reveal that the focused image shrinks with time below the diffraction limit, with a lateral resolution increasing from 0.8 lambda to 0.35 lambda, whereas focusing under harmonic excitation remains diffraction limited. Modal analysis reveals the role in pulse reconstruction of radiating lens resonances, which repeatedly self-synchronize at the focal spot to shape a superoscillating field.

引用

页数：5

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