Terahertz transmission properties of an individual slit in a thin metallic plate

Lee, J. W.; Park, T. H.; Nordlander, Peter; Mittleman, Daniel M.

doi:10.1364/oe.17.012660

Cited by 22 publications

(21 citation statements)

References 26 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%

“…[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: 61%

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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“…So such structures are always thought to have potential application for resonant narrow bandpass filter [14]. It is worth noting that the terahertz transmission of a single slit in a thin metallic structure shows the polarization-dependent property, which can be used to design a novel THz polarizer [15]. However, the design of a THz polarizer based on this principle has not been fully studied.…”

Section: Introductionmentioning

confidence: 99%

Influence of spatial incident angles on polarizer with a slit in grooved metal slabs for terahertz communication

Yuan¹,

Zhao²,

Zhang³

et al. 2015

Appl. Opt.

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We report the influence of two spatial incident angles on a terahertz polarizer, which is based on an aluminum slab with a center slit flanked by symmetrically distributed parallel grooves on both sides. Experimental results show that the polarizer shows narrow bandpass filtering effect with a very small divergence angle at normal incidence, which is very suitable for terahertz communication, and the extinction ratio (ER) can be achieved above 20 dB in the frequency band between 0.3 and 0.36 THz due to the excitation of spoof surface plasmon. As the structure rotates around the slit direction (β), the transmission peak will split into two and degrade quickly and the ER decreased down to 20 dB for β=10° at peak position. Rotating along grating period direction (γ) shows better tuning performance. The tuning frequency window can reach from 0.3 to 0.36 THz to promise an ER above 20 dB as γ is smaller than 25°.

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“…Although studies on single apertures have been performed in the terahertz range (see, for example, Ref. [41], among others), demonstrating similar effects using light in the visible range poses significant experimental challenges since the experiments needed to reveal the subwavelength regime of light transmission through such systems require state-of-the-art nanofabrication techniques to realize orders of magnitude smaller apertures (on the scale of ∼100 nm as opposed to ∼100 μm for terahertz studies).…”

Section: Introductionmentioning

confidence: 99%

Polarization dependence of light transmission through individual nanoapertures in metal films

Gunay¹,

Flanigan²,

Liu³

et al. 2014

J. Opt. Soc. Am. B

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We present a systematic study of light transmission through individual nanoscale apertures (rectangular slits and circular holes) etched in a 300-nm-thick silver film. Transmission spectra were obtained as functions of aperture shape and size, as well as the wavelength and polarization state of the normally incident light beam. By varying the wavelength of the incident light in the 550-750 nm range and the characteristic dimensions of the apertures from ∼100 nm to 10 μm, a universal behavior of light transmission is revealed. The role of incident polarization and aperture dimensions is investigated in detail, and a clear transition from the geometric regime of light transmission (large apertures) to the subwavelength regime is demonstrated experimentally. A quantitative analysis of the extinction coefficient is reported for rectangular slits, demonstrating that they can act as efficient linear polarizers with extinction ratios >100∶1. Finally, a method to convert far-field to near-field data is developed for circular apertures, revealing the contribution of surface plasmon polaritons to the decrease in light transmission for apertures below the cutoff condition.

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Terahertz transmission properties of an individual slit in a thin metallic plate

Cited by 22 publications

References 26 publications

Non-resonant terahertz field enhancement in periodically arranged nanoslits

Non-resonant terahertz field enhancement in periodically arranged nanoslits

Influence of spatial incident angles on polarizer with a slit in grooved metal slabs for terahertz communication

Polarization dependence of light transmission through individual nanoapertures in metal films

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