Extraordinary Magnetic Field Enhancement with Metallic Nanowire: Role of Surface Impedance in Babinet’s Principle for Sub-Skin-Depth Regime

Koo, Sukmo; Kumar, M. Sathish; Shin, Jonghwa; Kim, Dai‐Sik; Park, Namkyoo

doi:10.1103/physrevlett.103.263901

Cited by 51 publications

(33 citation statements)

References 18 publications

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“…When the nanogaps are irradiated with THz waves, induced current charges the capacitor formed by the sidewalls of the nanogap. For smaller gaps, Coulomb attraction brings opposite charges closer to the sidewalls and generates a field enhancement that is inversely proportional to the gap size 11,24 . Previously, a field enhancement of 1,000 was experimentally demonstrated for a non-resonant 70-nm-wide slit 11 , and much larger enhancements are expected for 1-nm-wide gaps.…”

Section: Article Nature Communications | Doi: 101038/ncomms3361mentioning

confidence: 99%

Atomic layer lithography of wafer-scale nanogap arrays for extreme confinement of electromagnetic waves

et al. 2013

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Squeezing light through nanometre-wide gaps in metals can lead to extreme field enhancements, nonlocal electromagnetic effects and light-induced electron tunnelling. This intriguing regime, however, has not been readily accessible to experimentalists because of the lack of reliable technology to fabricate uniform nanogaps with atomic-scale resolution and high throughput. Here we introduce a new patterning technology based on atomic layer deposition and simple adhesive-tape-based planarization. Using this method, we create vertically oriented gaps in opaque metal films along the entire contour of a millimetre-sized pattern, with gap widths as narrow as 9.9 Å, and pack 150,000 such devices on a 4-inch wafer. Electromagnetic waves pass exclusively through the nanogaps, enabling backgroundfree transmission measurements. We observe resonant transmission of near-infrared waves through 1.1-nm-wide gaps (l/1,295) and measure an effective refractive index of 17.8. We also observe resonant transmission of millimetre waves through 1.1-nm-wide gaps (l/4,000,000) and infer an unprecedented field enhancement factor of 25,000.

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Section: Article Nature Communications | Doi: 101038/ncomms3361mentioning

confidence: 99%

Atomic layer lithography of wafer-scale nanogap arrays for extreme confinement of electromagnetic waves

et al. 2013

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“…2,3 Even in lower frequencies where most metals are considered as perfect electric conductor ͑PEC͒, it has theoretically 4 and experimentally 5,6 been demonstrated that enhanced transmissions of electromagnetic wave through slits or rectangular apertures are possible when the thickness and the width of apertures are both in extreme subwavelength regime. As the metal thickness is reduced below submicron, apertures, and other fundamental metallic compositions for metamaterials, such as nanowires, 7,8 nanoparticles, 9 and split ring resonators, 10 cannot any more exist in free space. They must necessarily be fabricated on rigid substrates.…”

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Resonance behavior of single ultrathin slot antennas on finite dielectric substrates in terahertz regime

Park¹,

Koo

Suwal

et al. 2010

Applied Physics Letters

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We investigate resonance behaviors of optically thin metallic slot antennas on finite substrates in terahertz frequency regime. By carefully analyzing theoretical and experimental results, we observe that slot antennas fabricated in a gold film with a thickness below the skin depth of gold show blueshifted resonance frequencies for the increasing slot width, while the opposite resonance behaviors appear when the slot antennas are perforated in perfectly electric conductor. In addition, we find that for slot antenna sustained by a finite substrate its thickness and the slot width are additional crucial factors determining the resonance frequency of slot antennas.

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“…According to Ref. [18] we shall consider the complimentary structures: metallic nanogap and metallic nanowire of the same sizes illuminated by the TM and TE waves, respectively. Electric field enhancement for the nanogap has been discussed above and can be estimated in terms of the electric field at the center of the …”

Section: Resultsmentioning

confidence: 99%

Microscopic model of the THz field enhancement in a metal nanoslit

Novitsky

Zalkovskij

Malureanu

et al. 2011

Optics Communications

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We discuss the strong THz-field enhancement effect in a metal slit of dozens of nanometers sizes reported recently. Proposed simple microscopic model considers electric charges induced at the edges of the slit by a polarized incident wave. These charges contribute then to the field in the slit. The model is capable of explaining peculiarities of the field enhancement phenomenon such as an inverse frequency dependence of the enhancement factor. It provides closed-form expressions for the enhancement factor and field mapping inside the slit having only one fitting parameter. The model predicts influence of the slit shape on the field enhancement.

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Extraordinary Magnetic Field Enhancement with Metallic Nanowire: Role of Surface Impedance in Babinet’s Principle for Sub-Skin-Depth Regime

Cited by 51 publications

References 18 publications

Atomic layer lithography of wafer-scale nanogap arrays for extreme confinement of electromagnetic waves

Atomic layer lithography of wafer-scale nanogap arrays for extreme confinement of electromagnetic waves

Resonance behavior of single ultrathin slot antennas on finite dielectric substrates in terahertz regime

Microscopic model of the THz field enhancement in a metal nanoslit

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