Practical limitations of subwavelength resolution using negative-refractive-index transmission-line lenses

被引：29

作者：

Grbic, A ^{[1
]}

Eleftheriades, GV ^{[1
]}

机构：

[1] Univ Toronto, Dept Elect & Comp Engn, Toronto, ON M5S 3G4, Canada

来源：

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION | 2005年 / 53卷 / 10期

关键词：

diffraction limit; left-handed; metarnaterials; negative refractive index; plasmons; superresolution; transmission lines (TLs);

D O I：

10.1109/TAP.2005.856316

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Previously, we have demonstrated both analytically and experimentally subwavelength imaging using a negative-refractive-index lens made of a periodically L, C loaded transmission line (TL) network. This loaded transmission line network has been referred to as the dual TL lens. Here, we consider the limitations on subwavelength imaging imposed by impedance mismatches and the component losses of a practical dual TL lens. Simple expressions for estimating the resolving capability of a dual TL lens are given. It is found that the resolution enhancement of the dual lens is proportional to the quality factor of the series loading capacitors divided by the electrical thickness of the lens. The effective material parameters of the dual TL lens are also derived so that these expressions can be directly related to those of previous studies considering uniform and isotropic left-handed lenses. Finally, the resolving capability of an experimental lens that achieves subwavelength imaging is theoretically predicted. These theoretical predictions are then directly compared to previously reported experimental results.

引用

页码：3201 / 3209

页数：9

共 32 条

[1] Pairing an epsilon-negative slab with a mu-negative slab:: Resonance, tunneling and transparency [J].

Alù, A ;

Engheta, N .

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, 2003, 51 (10) :2558-2571

[2] Transmission line approach of left-handed (LH) materials and microstrip implementation of an artificial LH transmission line [J].

Caloz, C ;

Itoh, T .

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, 2004, 52 (05) :1159-1166

[3]

CALOZ C, 2002, USNC URSI NAT RAD SC

[4] Planar negative refractive index media using periodically L-C loaded transmission lines [J].

Eleftheriades, GV ;

Iyer, AK ;

Kremer, PC .

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, 2002, 50 (12) :2702-2712

[5] Imaging properties of a metamaterial superlens [J].

Fang, N ;

Zhang, X .

APPLIED PHYSICS LETTERS, 2003, 82 (02) :161-163

[6] Overcoming the diffraction limit with a planar left-handed transmission-line lens [J].

Grbic, A ;

Eleftheriades, GV .

PHYSICAL REVIEW LETTERS, 2004, 92 (11) :117403-1

[7] Negative refraction, growing evanescent waves, and sub-diffraction imaging in loaded transmission-line metamaterials [J].

Grbic, A ;

Eleftheriades, GV .

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, 2003, 51 (12) :2297-2305

[8] Periodic analysis of a 2-D negative refractive index transmission line structure [J].

Grbic, A ;

Eleftheriades, GV .

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, 2003, 51 (10) :2604-2611

[9] Dispersion analysis of a micro-strip-based negative refractive index periodic structure [J].

Grbic, A ;

Eleftheriades, GV .

IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS, 2003, 13 (04) :155-157

[10] Growing evanescent waves in negative-refractive-index transmission-line media [J].

Grbic, A ;

Eleftheriades, GV .

APPLIED PHYSICS LETTERS, 2003, 82 (12) :1815-1817

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