Terahertz near-field enhancement in narrow rectangular apertures on metal film

Park, D. J.; Choi, Soo Bong; Ahn, Y. H.; Rotermund, Fabıan; Sohn, Ik-Bu; Kang, Chul; Jeong, Mun Seok; Kim, D. S.

doi:10.1364/oe.17.012493

Cited by 44 publications

(27 citation statements)

References 46 publications

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“…(13) for infinitely large periods P. The inverse frequency dependence for a single slit well known from the literature 15,16,20,24 is clearly noticed. The geometric parameters w and h enter not only to the explicitly written arctangent function but also to the quantityc ¼ c þ c 0 (remember that c 0 is defined by Eq.…”

Section: Microscopic Model a Field Enhancementmentioning

confidence: 62%

“…[15][16][17][18][19] Park et al 19 observed a 170-fold field enhancement through an array of slits studied in terms of broadband filtering; an enhancement of about 430 was expected in the near field of periodic rectangular slits. 18 At THz frequencies, bulk 20-100 nm thick metal films become non-transparent and reflects most of the incident radiation (in the visible 20 nm, film can transmit up to 50%).…”

Section: Introductionmentioning

confidence: 99%

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Non-resonant terahertz field enhancement in periodically arranged nanoslits

Novitsky¹,

Ivinskaya²,

Zalkovskij³

et al. 2012

Journal of Applied Physics

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Ultra-low power electrically reconfigurable magnetoelectric microwave devices J. Appl. Phys. 112, 073915 (2012) Broadband and ultrathin screen with magnetic substrate for microwave reflectivity reduction Appl. Phys. Lett. 101, 154101 (2012) Tunable, narrow-band, all-metallic microwave absorber Appl. Phys. Lett. 101, 141115 (2012) Insertable system for fast turnaround time microwave experiments in a dilution refrigerator Rev. Sci. Instrum. 83, 093904 (2012) Coherent terahertz radiation from high-harmonic component of modulated free-electron beam in a tapered twoasymmetric grating structure Appl. Phys. Lett. 101, 123503 (2012) Additional information on J. Appl. Phys. We analyze ultra strong non-resonant field enhancement of THz field in periodic arrays of nanoslits cut in ultrathin metal films. The main feature of our approach is that the slit size and metal film thickness are several orders of magnitude smaller than the wavelength k of the impinging radiation. Two regimes of operation are found. First, when the grating period P ( k, frequency-independent enhancement is observed, accompanied by a very high transmission approaching unity. With high accuracy, this enhancement equals the ratio of P to the slit width w. Second, when the grating period approaches the THz wavelength but before entering the Raleigh-Wood anomaly, the field enhancement in nanoslit stays close to that in a single isolated slit, i.e., the well-known inversefrequency dependence. Both regimes are non-resonant and thus extremely broadband for P < k. The results are obtained by the microscopic Drude-Lorentz model taking into account retardation processes in the metal film and validated by the finite difference frequency domain method. We expect sensor and modulation applications of the predicted giant broadband field enhancement.

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Section: Microscopic Model a Field Enhancementmentioning

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Non-resonant terahertz field enhancement in periodically arranged nanoslits

Novitsky¹,

Ivinskaya²,

Zalkovskij³

et al. 2012

Journal of Applied Physics

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show abstract

“…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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“…1(a)) [3][4][5]. Here, both reflected wave and transmitted wave are assumed as a summation of diffracted waves, and the electromagnetic field inside the slit is expanded following a cavity mode with open boundary condition.…”

Section: Theory Model and Emi Shielding Breaching In DC Limitmentioning

confidence: 99%

A Breaching of Electromagnetic Shielding by Narrow Aperture in Metal Film

Park

Chu²,

Kyoung

et al. 2016

Journal of the Optical Society of Korea

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We report a theoretical research for the condition of electromagnetic shield breaching when a narrow aperture is punctured in thin metal film. To calculate electromagnetic field transmission through a narrow slit, a Rayleigh wave expansion has been applied for free standing, thin metal film. We found that the DC electric field allows perfect transmission when the length of the slit is infinite, regardless of the other geometrical factors such as slitwidth and thickness. Slitwidth dependent transmission spectra as a function of frequency shows a cutoff frequency that decreases almost linearly to the slitwidth, giving that almost successful shielding is only possible when the slitwidth is smaller than 1 micron.

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Terahertz near-field enhancement in narrow rectangular apertures on metal film

Cited by 44 publications

References 46 publications

Non-resonant terahertz field enhancement in periodically arranged nanoslits

Non-resonant terahertz field enhancement in periodically arranged nanoslits

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

A Breaching of Electromagnetic Shielding by Narrow Aperture in Metal Film

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