Direct Observation of a Transition of a Surface Plasmon Resonance from a Photonic Crystal Effect

Zhang, Weili; Azad, Abul K.; Han, Jiaguang; Xu, Jun; Chen, Jian; Zhang, X.-C.

doi:10.1103/physrevlett.98.183901

Cited by 80 publications

(70 citation statements)

References 32 publications

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“…6,7 Because MHAs are novel candidates for use as components in THz devices, such as filters, 8 optical switches, 9 sensors, 10 etc., the features of MHA surface waves at normal incidence have been investigated in detail by changing parameters such as the number of holes, 11 the hole diameter, 12 the coating thickness of the dielectric film on the metal surface, 13 etc. In general, this enhanced transmission characteristic is one type of plasmonic property that has been widely studied in THz plasmonic metamaterial systems, [14][15][16][17][18][19][20] which is typically composed of periodically arranged unit cells. More importantly, the mode splitting effect observed in asymmetrical metamaterial systems results from the near-field coupling induced by the strong coupling between a bright eigenmode and a dark eigenmode.…”

Section: Introductionmentioning

confidence: 99%

Mode splitting transmission effect of surface wave excitation through a metal hole array

et al. 2013

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The resonant frequencies of the excited surface waves on a metal hole array with respect to the incident angle were studied in the terahertz region. The experimental and theoretical results demonstrate that the resonant peak of surface wave excitation splits into two when transmitted through a metal hole array off-normally. The high-order mode with resonant frequency above the cutoff frequency f c (plasma frequency effect) has a shorter attenuation length than that of the low-order mode whose resonant frequency is below f c . The reason is that the high-order mode is a coupled mode consisting of surface wave and hole modes, while the low-order mode is just an excited surface wave (which can be considered as the spoof surface plasmons). Our investigation may open a door to distinguish the spoof surface plasmons and the coupled modes of surface waves and hole modes.

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Section: Introductionmentioning

confidence: 99%

Mode splitting transmission effect of surface wave excitation through a metal hole array

et al. 2013

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“…Some structures have direct applications in proposed photonic devices; in others the dynamic control can provide direct evidence for transmission pathways and for the role of material properties in determining the behavior of a structure. 3 Manipulating material properties optically [4][5][6][7][8][9][10] is of particular interest, as changes to the structure can be made on the same time scale as the transit of light pulses through the system.…”

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confidence: 99%

Optical control over transmission of terahertz radiation through arrays of subwavelength holes of varying size

2009

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We modulate the transmission of terahertz ͑THz͒ radiation through periodic arrays of subwavelength holes in a metallic film by using pulses of visible-wavelength light to photoexcite the semiconducting substrate of the hole arrays. By varying the photodoping level of the semiconductor we are able to switch off the resonant transmission of THz radiation through the array. By varying the size of the holes, we demonstrate the crucial role that surface modes play in the resonant transmission and ultimately in the photomodulation behavior of these structures. We demonstrate that the surface-wave transmission mechanism can allow for very efficient optical modulation of radiation transmission. DOI: 10.1103/PhysRevB.80.193412 PACS number͑s͒: 71.45.Gm, 41.20.Jb, 84.40.Ϫx Photonic structures which incorporate some degree of dynamic control over their electromagnetic properties 1,2 are interesting for numerous reasons. Some structures have direct applications in proposed photonic devices; in others the dynamic control can provide direct evidence for transmission pathways and for the role of material properties in determining the behavior of a structure. 3 Manipulating material properties optically 4-10 is of particular interest, as changes to the structure can be made on the same time scale as the transit of light pulses through the system.One very fundamental photonic structure is an array of subwavelength holes perforated in a conducting screen. Such arrays can exhibit narrow transmission resonances 11 for wavelengths determined by the periodicity of the array-this is known as extraordinary optical transmission or EOT. The mechanisms underlying EOT in these arrays have been the subject of considerable debate, 12-14 however consensus has gradually emerged that for many structures the transmission is mediated at least in part by electromagnetic surface modes at the interface between the perforated conducting screen and the dielectric layers by which it is bound. 15,16 In this contribution we use pulses of visible light to modulate the transmission of terahertz ͑THz͒ radiation through periodic arrays of subwavelength holes in a metallic film fabricated at the interface of a substrate of crystalline silicon. By varying the photodoping level of the silicon we are able to switch off EOT of THz radiation through the array. By varying the size of the holes we are able to explain the photomodulation effects in terms of the properties of the surface mode which mediates the enhanced transmission; in particular, we can make a direct link between the lifetime of the surface mode and the magnitude of the photomodulation. We show that if we extend the surface-mode lifetime by minimizing losses and reducing the hole size it is possible to attain photomodulation levels which are orders of magnitude greater than those found for a plain silicon surface.The hole-array structure we shall consider in this work ͑Fig. 1͒ is formed from a 150-nm-thick film of gold on a silicon substrate. The gold is perforated with a square lattice ͑pitch 10...

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“…12,13 Recently, there has been great interest in the transmission properties of various subwavelength apertures, including one-dimensional and two-dimensional (2D) symmetry structures, in the THz frequency range. [14][15][16][17][18][19][20][21][22] However, most of these subwavelength structures have been tailored on metallic or semiconducting materials, and few reports have concentrated on the enhanced transmission properties of THz waves through carbon nanotube (CNT) films. At THz frequencies, carbon nanotube films, including single-walled carbon nanotube (SWCNT) films and multi-walled carbon nanotube (MWCNT) films, exhibit metallic characteristics because of the presence of a negative real part in the complex dielectric constant, and they can thus be regarded as an alternate media for supporting SPPs.…”

Section: Introductionmentioning

confidence: 99%

Transmission properties of terahertz waves through asymmetric rectangular aperture arrays on carbon nanotube films

2016

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Transmission spectra of terahertz waves through a two-dimensional array of asymmetric rectangular apertures on super-aligned multi-walled carbon nanotube films were obtained experimentally. In this way, the anisotropic transmission phenomena of carbon nanotube films were observed. For a terahertz wave polarization parallel to the orientation of the carbon nanotubes and along the aperture short axis, sharp resonances were observed and the resonance frequencies coincided well with the surface plasmon polariton theory. In addition, the minima of the transmission spectra were in agreement with the location predicted by the theory of Wood’s anomalies. Furthermore, it was found that the resonance profiles through the carbon nanotube films could be well described by the Fano model.

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Direct Observation of a Transition of a Surface Plasmon Resonance from a Photonic Crystal Effect

Cited by 80 publications

References 32 publications

Mode splitting transmission effect of surface wave excitation through a metal hole array

Mode splitting transmission effect of surface wave excitation through a metal hole array

Optical control over transmission of terahertz radiation through arrays of subwavelength holes of varying size

Transmission properties of terahertz waves through asymmetric rectangular aperture arrays on carbon nanotube films

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