Controlling terahertz radiation with nanoscale metal barriers embedded in nano slot antennas

Hyeong Ryeol Park; Young Mi Bahk; Kwang Jun Ahn; Q. Han Park; Dai Sik Kim; Luis Martín-Moreno; Francisco J. García-Vidal; Jorge Bravo-Abad

doi:10.1021/nn2031885

Controlling terahertz radiation with nanoscale metal barriers embedded in nano slot antennas

Hyeong Ryeol Park, Young Mi Bahk, Kwang Jun Ahn, Q. Han Park, Dai Sik Kim, Luis Martín-Moreno, Francisco J. García-Vidal, Jorge Bravo-Abad

Department of Physics

Research output: Contribution to journal › Article › peer-review

30 Citations (Scopus)

Abstract

Nanoscale metallic barriers embedded in terahertz (THz) slot antennas are shown to provide unprecedented control of the transition state arising at the crossover between the full- and half-wavelength resonant modes of such antennas. We demonstrate strong near-field coupling between two paired THz slot antennas separated by a 5 nm wide nanobarrier, almost fully inducing the shift to the resonance of the double-length slot antenna. This increases by a factor of 50 the length-scale needed to observe similar coupling strengths in conventional air-gap antennas (around 0.1 nm), making the transition state readily accessible to experiment. Our measurements are in good agreement with a quantitative theoretical modeling, which also provides a simple physical picture of our observations.

Original language	English
Pages (from-to)	8340-8345
Number of pages	6
Journal	ACS nano
Volume	5
Issue number	10
DOIs	https://doi.org/10.1021/nn2031885
Publication status	Published - 2011 Oct 25

Keywords

nanoparticle detection
paired antenna
subskin depth barrier
terahertz nano slot antenna
terahertz spectroscopy

ASJC Scopus subject areas

Materials Science(all)
Engineering(all)
Physics and Astronomy(all)

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10.1021/nn2031885

Cite this

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abstract = "Nanoscale metallic barriers embedded in terahertz (THz) slot antennas are shown to provide unprecedented control of the transition state arising at the crossover between the full- and half-wavelength resonant modes of such antennas. We demonstrate strong near-field coupling between two paired THz slot antennas separated by a 5 nm wide nanobarrier, almost fully inducing the shift to the resonance of the double-length slot antenna. This increases by a factor of 50 the length-scale needed to observe similar coupling strengths in conventional air-gap antennas (around 0.1 nm), making the transition state readily accessible to experiment. Our measurements are in good agreement with a quantitative theoretical modeling, which also provides a simple physical picture of our observations.",

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AU - Ahn, Kwang Jun

AU - Park, Q. Han

AU - Kim, Dai Sik

AU - Martín-Moreno, Luis

AU - García-Vidal, Francisco J.

AU - Bravo-Abad, Jorge

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Controlling terahertz radiation with nanoscale metal barriers embedded in nano slot antennas

Abstract

Keywords

ASJC Scopus subject areas

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