Terahertz Magnetic Response from Artificial Materials

Yen, Ta‐Jen; Padilla, Willie J.; Fang, Nicholas X.; Vier, D. C.; Smith, David R.; Pendry, J. B.; Basov, D. N.; Zhang, Xiang

doi:10.1126/science.1094025

Cited by 1,433 publications

(752 citation statements)

References 19 publications

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“…Within several years, magnetic metamaterials, and consequently NIMs have been advanced from microwave frequencies to the visible region, by scaling down the structure size and taking prudent designs. [16][17][18] Negative permeability is the heart of NIMs. To achieve magnetic resonance at optical frequencies, however, it is shown that the size of SRRs has to be smaller than 100 nanometres, and the gap is less than 10 nanometres.…”

Section: Negative Index Metamaterials and Applications Of Metamaterialsmentioning

confidence: 99%

Metamaterials: a new frontier of science and technology

Liu¹,

2011

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Metamaterials, artificial composite structures with exotic material properties, have emerged as a new frontier of science involving physics, material science, engineering and chemistry. This critical review focuses on the fundamentals, recent progresses and future directions in the research of electromagnetic metamaterials. An introduction to metamaterials followed by a detailed elaboration on how to design unprecedented electromagnetic properties of metamaterials is presented. A number of intriguing phenomena and applications associated with metamaterials are discussed, including negative refraction, sub-diffraction-limited imaging, strong optical activities in chiral metamaterials, interaction of meta-atoms and transformation optics. Finally, we offer an outlook on future directions of metamaterials research including but not limited to three-dimensional optical metamaterials, nonlinear metamaterials and ''quantum'' perspectives of metamaterials (142 references).

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Section: Negative Index Metamaterials and Applications Of Metamaterialsmentioning

confidence: 99%

Metamaterials: a new frontier of science and technology

Liu¹,

2011

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“…Aydin et al recently reported subwavelength focusing by using a LHM flat lens [12]. Most of the experimental measurements on LHMs are performed on microwave frequency region; but there is a tendency to increase the operation frequency up to terahertz [13,14] and even optical frequencies [15].…”

Section: Introductionmentioning

confidence: 99%

Verification of impedance matching at the surface of left‐handed materials

Aydın

Bulu

Özbay

2006

Micro & Optical Tech Letters

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Impedance matching at the surface of left-handed materials (LHM) is required for certain applications including a perfect lens. In this study, we present the experimental and theoretical verification of an impedance-matched LHM to free space. Reflection characteristics of both one-dimensional and two-dimensional LHM were investigated. The reflection was observed to be very low at a narrow frequency range. FDTD simulations and retrieval procedures were used to theoretically verify impedance matching. By varying the number of layers along the propagation direction, the ultralow reflection at specific frequencies was shown to be independent of the sample thickness. © 2006 Wiley Periodicals, Inc

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“…Currently, the samples of left-handed materials are created only in microwave region [4]. The creation of lefthanded materials at THz frequencies and in optical range meets with problems related to the difficulty in getting required magnetic properties [5,6] which have to be created artificially. In the absence of magnetic properties the lenses formed by materials with negative permittivity only (for example, silver at optical frequencies) are still capable to create images with sub-wavelength resolution, but the operation is restricted to p-polarization only and the lens has to be thin as compared to the wavelength [1].…”

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confidence: 99%

Subwavelength imaging at optical frequencies using a transmission device formed by a periodic layered metal-dielectric structure operating in the canalization regime

2006

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Imaging with sub-wavelength resolution using a lens formed by periodic metal-dielectric layered structure is demonstrated. The lens operates in canalization regime as a transmission device and it does not involve negative refraction and amplification of evanescent modes. The thickness of the lens have to be an integer number of half-wavelengths and can be made as large as required for ceratin applications, in contrast to the other sub-wavelength lenses formed by metallic slabs which have to be much smaller than the wavelength. Resolution of λ/20 at 600 nm wavelength is confirmed by numerical simulation for a 300 nm thick structure formed by a periodic stack of 10 nm layers of glass with ǫ = 2 and 5 nm layers of metal-dielectric composite with ǫ = −1. Resolution of λ/60 is predicted for a structure with same thickness, period and operating frequency, but formed by 7.76 nm layers of silicon with ε = 15 and 7.24 nm layers of silver with ε = −14.PACS numbers: 78.20. Ci, 42.30.Wb,41.20.Jb The possibility of imaging with sub-wavelength resolution was first reported by Pendry in 2000 [1]. It was shown that the slab of left-handed material [2], a medium with both negative permittivity and permeability, can create images with nearly unlimited resolution. This idea impeached validity of classical restriction on resolution of imaging systems: diffraction limit and became a starting point for creation of new research area of metamaterials [3], artificial media possessing extraordinary electromagnetic properties usually not available in the natural materials. The idea of Pendry's perfect lens is based on such exotic phenomena observable in left-handed media as backward waves, negative refraction and amplification of evanescent waves. The far-field of a source is focused due to effects of backward waves and negative refraction. The near field of the source, which contains sub-wavelength details, is recovered in the image plane because of the amplification of evanescent modes in the slab. Currently, the samples of left-handed materials are created only in microwave region [4]. The creation of lefthanded materials at THz frequencies and in optical range meets with problems related to the difficulty in getting required magnetic properties [5,6] which have to be created artificially. In the absence of magnetic properties the lenses formed by materials with negative permittivity only (for example, silver at optical frequencies) are still capable to create images with sub-wavelength resolution, but the operation is restricted to p-polarization only and the lens has to be thin as compared to the wavelength [1]. This idea was confirmed by recent experimental results [7] which demonstrated the reality of sub-wavelength imaging using silver slabs in optical frequency range. The resolution of such lenses is restricted by losses in the silver, but this problem can be alleviated by cutting the slab into the multiple thin layers [8,9] and introduction of active materials [10]. Unfortunately, at the moment there is no recipe how to incre...

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Terahertz Magnetic Response from Artificial Materials

Cited by 1,433 publications

References 19 publications

Metamaterials: a new frontier of science and technology

Metamaterials: a new frontier of science and technology

Verification of impedance matching at the surface of left‐handed materials

Subwavelength imaging at optical frequencies using a transmission device formed by a periodic layered metal-dielectric structure operating in the canalization regime

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