Shape resonance omni-directional terahertz filters with near-unity transmittance

Lee, Juwon; Seo, Mi Hae; Park, D. J.; Kim, D. S.; Jeoung, Sae Chae; Lienau, Christoph; Park, Q-Han; Planken, Paul C. M.

doi:10.1364/oe.14.001253

Cited by 99 publications

(53 citation statements)

References 30 publications

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“…In the terahertz regime, SPs have recently attracted much attention and become an attractive new area [10][11][12][13][14][15][16][17][18][19]. Due to a drastic increase in the value of dielectric function ε m = ε rm + iε im , most metals become highly conductive at terahertz frequencies.…”

Section: Introductionmentioning

confidence: 99%

Resonant terahertz transmission in plasmonic arrays of subwavelength holes

Zhang

2008

Eur. Phys. J. Appl. Phys.

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Abstract.A review of transmission properties of two-dimensional plasmonic structures in the terahertz regime is presented. Resonant terahertz transmission was demonstrated in arrays of subwavelength holes patterned on both metals and semiconductors. The effects of hole shape, hole dimensions, dielectric function of metals, array film thickness, and a dielectric overlayer were investigated by the state-of-the-art terahertz spectroscopy modalities. Extraordinary terahertz transmission was demonstrated in arrays of subwavelength holes made even from Pb, a generally poor metal, and having optically thin thicknesses less than one-third of a skin depth. We also observed a direct transition of a surface plasmon resonance from a photonic crystal minimum in a photo-doped semiconductor array. According to the Fano model, transmission properties of such plasmonic arrays are characterized by two essential contributions: resonant excitation of surface plasmons and nonresonant direct transmission. Plasmonic structures will find fascinating applications in terahertz imaging, biomedical sensing, subwavelength terahertz spectroscopy, and integrated terahertz devices. PACS

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Section: Introductionmentioning

confidence: 99%

Resonant terahertz transmission in plasmonic arrays of subwavelength holes

Zhang

2008

Eur. Phys. J. Appl. Phys.

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“…[4][5][6] Klien and co-workers [7][8][9][10][11][12][13][14][15][16][17] have experimentally found that the hole shape also has a strong effect on the transmission characteristics of MHAs; this effect is known as localized resonance, and it has been investigated extensively. Ruan et al 9 have calculated the transmission spectra of periodically arranged and randomly distributed rectangular holes and found a transmission peak whose frequency is almost independent of the period.…”

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confidence: 99%

Coupling between localized resonance and excitation of surface waves in metal hole arrays

Miyamaru

Takeda

2009

Phys. Rev. B

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We investigate the transition of the dominant resonant transmission mechanism from localized resonance to excitation of surface waves and vice versa in metal hole arrays. The transition occurs continuously with a change in the length of the rectangular holes. We also study the effect of the incident-beam diameter and surface condition on the transmission spectrum. Our experimental results show the important differences between the two mechanisms. They also confirm the theoretical prediction of Bravo-Abad et al. ͓Phys In the last few decades, several studies have investigated resonant transmission properties of electromagnetic waves in metal hole arrays ͑MHAs͒. In 1967, Ulrich 1 reported the band-pass transmission characteristics of MHAs and attributed them to the excitation of surface waves ͑ESWs͒, known as Zenneck waves, in the radio-frequency region; these waves are analogous to surface-plasmon polaritons ͑SPPs͒ in the visible region.2 Later, Ebbesen et al. 3 conducted a study similar to that of Ulrich and demonstrated that subwavelength MHAs exhibit extraordinary transmission characteristics in the visible region. Since then, many studies have been conducted to investigate the mechanism of resonant transmission in MHAs.It is widely believed that the main mechanism responsible for resonant transmission is ESWs that is based on the interference of multiple electromagnetic waves scattered by periodically arranged holes. [4][5][6] Klien and co-workers 7-17 have experimentally found that the hole shape also has a strong effect on the transmission characteristics of MHAs; this effect is known as localized resonance, and it has been investigated extensively. Ruan et al. 9 have calculated the transmission spectra of periodically arranged and randomly distributed rectangular holes and found a transmission peak whose frequency is almost independent of the period. Very recently, some studies have investigated the effects of hole size and aspect ratio on transmission characteristics.10 In particular, Lee et al. 11 have experimentally demonstrated the effect of the length of randomly arranged rectangular holes on transmission spectra and showed that the resonant peak clearly depends on the hole length; this result is consistent with the theory of half-wavelength resonance. They have also found that the periodic structure enhances the transmission peak of localized resonance. Molen et al.14 have reported that the dispersion relation of the peak frequency depends on the aspect ratio of rectangular metal holes.In this Brief Report, we describe a study conducted to better understand the effect of localized resonance in an MHA. We investigate the transition of the dominant resonant transmission mechanism from localized resonance to ESWs by examining the changes in the transmission spectra that occur when we change the length of the rectangular holes. The measured transmission peak of the MHA shows a redshift as the hole length increases; the incident polarization is perpendicular to the fixed axis of the holes. When the hole...

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“…In this sense, a well-designed aperture can be the most efficient way of focusing electromagnetic energy beyond diffraction limit [2], provided that a resonant condition for large near-field enhancement is met. This type of near-field focusing is implicit in many experiments, including far-field transparency [3,4] at the fundamental resonance [5][6][7]. Near-field enhancement [8] and focusing would be particularly desirable in the terahertz range where most tabletop laboratory sources are too weak to induce, for example, nonlinear effects or to detect single molecules [9][10][11].…”

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confidence: 99%

Near field imaging of terahertz focusing onto rectangular apertures

Seo¹,

Adam²,

Kang³

et al. 2008

Opt. Express

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Abstract:We performed terahertz near-field experiments on single rectangular holes with various lengths grown on an electro-optic crystal substrate with λ/100 resolution. We find that the near-field amplitude becomes proportionally larger as the rectangle becomes narrower, strongly suggesting that a constant energy passes through even for a very narrow slit. The occurrence of a large field enhancement at the fundamental localized resonance is discussed confirming the funneling of energy at the near-field.

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Shape resonance omni-directional terahertz filters with near-unity transmittance

Cited by 99 publications

References 30 publications

Resonant terahertz transmission in plasmonic arrays of subwavelength holes

Resonant terahertz transmission in plasmonic arrays of subwavelength holes

Coupling between localized resonance and excitation of surface waves in metal hole arrays

Near field imaging of terahertz focusing onto rectangular apertures

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