Microscopic model of the THz field enhancement in a metal nanoslit

Novitsky, Andrey; Zalkovskij, Maksim; Malureanu, Radu; Lavrinenko, Andrei V.

doi:10.1016/j.optcom.2011.08.019

Cited by 19 publications

(19 citation statements)

References 19 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: 61%

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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: 61%

“…The friction term results from the retardation effects. For large periods, e.g., for a single slit, R $ P and x 2 0 $ 1=P, so that the dependence on period P disappears 24 in the damping rate c 0 . With the screening force (8), the equation of motion (3) for the electron reads…”

Section: Microscopic Model a Field Enhancementmentioning

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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“…Here, we focus on subwavelength-thin metal screens for which no resonances exist, and we present accurate, yet simple, analytical formulas for key parameters, like the average field enhancement in the slit and the transmission efficiency. The analytical description is consis- * alp@iti.sdu.dk tent with numerical calculations and related theoretical [14] and experimental work [15], hence establishing insight into the process of passing light through slit apertures.…”

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confidence: 99%

Enhanced nonresonant light transmission through subwavelength slits in metal

Pors¹,

Nerkararyan

Sahakyan

et al. 2016

Opt. Lett.

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We analytically describe light transmission through a single subwavelength slit in a thin perfect electric conductor screen for the incident polarization being perpendicular to the slit, and derive simple, yet accurate, expressions for the average electric field in the slit and the transmission efficiency. The analytic results are consistent with full-wave numerical calculations, and demonstrate that slits of widths ∼ 100 nm in real metals may feature non-resonant (i.e., broadband) field enhancements of ∼ 100 and transmission efficiency of ∼ 10 at infrared or terahertz frequencies, with the associated metasurface-like array of slits becoming transparent to the incident light.General perception of light transmission through deeply subwavelength apertures in opaque metal screens was first considerably changed back in 1998, when the phenomenon of extraordinary optical transmission (EOT) was introduced [1]. Previously, it was generally accepted that subwavelength apertures, similar to small particles, only weakly interact with the incident light, exhibiting progressively lower transmission for the apertures becoming smaller than the light wavelength. In the EOT case, which typically occurs at visible and near-infrared wavelengths, periodic arrays of apertures (or isolated apertures surrounded by periodic structures [2]) facilitate constructive excitation of surface plasmon polaritons that transpires to resonant transmission of light, with apertures demonstrating a normalized-to-area transmission considerably larger than one.We note that the work done in relation to EOT is vast, and for a detailed overview of past achievements we refer to a selection of comprehensive review papers [3][4][5][6]. In this Letter, we revisit the case of light transmission through an isolated one-dimensional subwavelength slit in an otherwise opaque metal screen that can be treated as a perfect electric conductor (PEC). This kind of configuration has been subject to analytical, numerical, and experimental treatments in the past, but we emphasize that in most of those studies extraordinary transmission occurs due to either standing-wave resonances in thick metal screens [7][8][9] or shape resonances in wide slits [10][11][12], with the former type of resonance also being utilized in realizing perfect endoscopes in arrayed counterparts [13]. Here, we focus on subwavelength-thin metal screens for which no resonances exist, and we present accurate, yet simple, analytical formulas for key parameters, like the average field enhancement in the slit and the transmission efficiency. The analytical description is consis- * alp@iti.sdu.dk The considered configuration represents a onedimensional slit of subwavelength width d in a PEC film of thickness t (Fig. 1). The incident field is chosen to be a transverse magnetic (TM) polarized plane wave (i.e., H z , E x , E y = 0) propagating normal to the film surface, with electric and magnetic field components defined byHere, we implicitly assume harmonic-time dependence exp(−iωt), k = 2π/λ is the wave num...

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“…It creates a strong enhanced electric field [red arrows in Fig. 1(b)] in the nanoslit [6,8]. The NIR wave is localized in the high-index chalcogenide glass slab and propagates in the z direction.…”

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confidence: 99%