Near field imaging of terahertz focusing onto rectangular apertures

Seo, Myung Hwan; Adam, A.J.L.; Kang, Jong Soon; Lee, Juwon; Ahn, Kwang Jun; Park, Q. H.; Planken, Paul C. M.; Kim, D. S.

doi:10.1364/oe.16.020484

Cited by 69 publications

(33 citation statements)

References 23 publications

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“…Furthermore, they've predicted that a large enhancement of the electric field at the hole can be expected. Near-field measurements of rectangular holes have been performed by Seo et al with λ/100 resolution [78]. They proved that the near-field amplitude becomes proportionally larger as the rectangle becomes narrower as expected by the simulations.…”

Section: Aperturesmentioning

confidence: 82%

Review of Near-Field Terahertz Measurement Methods and Their Applications

Adam

2011

J Infrared Milli Terahz Waves

202

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In the last decades, many research teams working at Terahertz frequencies focused their efforts on surpassing the diffraction limit. Numerous techniques have been investigated, combining methods existing at optic wavelength with THz system such as Time Domain Spectroscopy. The actual development led on one side to a resolution as high as λ/3000 and one the other side to a video-rate recording. The purpose of this paper is to give an overview of the history of the field, to describe the different approaches, to give examples of existing applications and to draw the perspective for this research area.

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Section: Aperturesmentioning

confidence: 82%

Review of Near-Field Terahertz Measurement Methods and Their Applications

Adam

2011

J Infrared Milli Terahz Waves

202

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“…The limit λ R ≈ √ ελ c for thin films has been advanced in previous works when studying, both experimentally and theoretically, systems containing empty circular, square, and rectangular holes 17,20,21 in asymmetric configurations. However, when rectangular holes combined with high-index dielectric substrates are considered, 21 this prediction is not accurate enough, as has also been stated in Ref.…”

Section: -2mentioning

confidence: 99%

“…This implies that the field inside the holes does not experience a strong decay, photons spend a long time in the system, and transmission resonances can eventually take place. Recent numerical studies and experiments of near-field enhancement [17][18][19] and enhanced transmission [20][21][22] have shown unexpected redshifts of the near field and transmission features compared to λ c . These works consider either isolated holes or arrays of apertures combined with dielectric substrates and are developed in the terahertz (THz) and optical regimes.…”

Section: Introductionmentioning

confidence: 99%

Effect of film thickness and dielectric environment on optical transmission through subwavelength holes

et al. 2012

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We present a detailed theoretical study for the spectral position of transmission resonances appearing in isolated subwavelength apertures in metallic films. We provide analytical expressions for the resonant wavelength as a function of the film thickness and the dielectrics surrounding (and filling) the system that are valid for hole shapes supporting large-cutoff wavelengths and for both isolated and periodically arranged holes. Our results are quantitatively valid in the microwave and terahertz regimes, but they also have qualitative validity in the optical regime. Our results show that for unfilled holes, in the limiting case when the hole is in a very thin film (metal thickness much smaller than the wavelength), the transmission resonance is controlled by a length scale related to the vanishing of the effective admittance of vacuum, as seen from the hole. On the contrary, for metal thicknesses larger than half the wavelength, the transmission resonance is controlled by the cutoff of the fundamental waveguide mode inside the hole. When thin films and high-index dielectrics are combined, the spectral location of the maximum transmission can be strongly redshifted compared to the cutoff wavelength of the apertures, and transmission intensity is substantially enhanced.

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“…However, in the case of high refractive index (e.g., n≈ 3.59 for GaAs or GaP), this resonance appears at much longer wavelengths, as it was reported from experiments in the THz regime. 10 In this letter we present systematic studies of the enhanced transmission through the annular aperture arrays and its dependence on size, shape and period of the plasmonic nanostructures on high refractive index substrates that allows to emulate the plasmonic structures on LED chips. The influence of nanofabrication tolerances on optical properties of plasmonic AAA on high-index sub- strates are also studied.…”

mentioning

confidence: 99%

Optical transmission of periodic annular apertures in metal film on high-refractive index substrate: The role of the nanopillar shape

Bouillard

Einsle

Dickson

et al. 2010

Applied Physics Letters

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The influence of annular aperture parameters on the optical transmission through arrays of coaxial apertures in a metal film on high refractive index substrates has been investigated experimentally and numerically. It is shown that the transmission resonances are related to plasmonic crystal effects rather than frequency cutoff behavior associated with annular apertures. The role of deviations from ideal aperture shape occurring during the fabrication process has also been studied. Annular aperture arrays are often considered in many applications for achieving high optical transmission through metal films and understanding of nanofabrication tolerances are important.

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Near field imaging of terahertz focusing onto rectangular apertures

Cited by 69 publications

References 23 publications

Review of Near-Field Terahertz Measurement Methods and Their Applications

Review of Near-Field Terahertz Measurement Methods and Their Applications

Effect of film thickness and dielectric environment on optical transmission through subwavelength holes

Optical transmission of periodic annular apertures in metal film on high-refractive index substrate: The role of the nanopillar shape

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