Enhanced broad-band extraordinary optical transmission through subwavelength perforated metallic films on strongly polarizable substrates (original) (raw)
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Journal of Applied Physics, 2010
We fabricate a series of square-lattice subwavelength circular, rectangular, and trapezoidal air-hole arrays drilled in opaque gold thin films and measured the transmission spectra of light passing through these metallic nanostructures in the near-infrared range. The measured results show strong dependence of extraordinary optical transmission on the lattice constant, hole size, and hole shape. The wavelengths of the transmission peaks and dips are mainly determined by the lattice constant. However, they are also influenced by the parameters of the hole size and hole shape. The experimental data agree well with numerical calculation results by means of a plane-wave transfer-matrix method when the detailed geometry of the air holes is fully considered. The results indicate that the extraordinary light transmission through subwavelength metallic nanostructures of air-hole arrays are governed by excitation of surface plasmon polaritons on the metal surface and their scattering by periodic air-hole arrays.
Strongly enhanced optical transmission through subwavelength holes in metal films
Physica B: Condensed Matter, 2000
The optical transmission through a subwavelength aperture in a metal "lm is strongly enhanced when the incident light interacts resonantly with surface plasmons on the surface of the metal. Such interactions are made allowed by a periodic corrugation of the metal surface. We apply this principle on a near-"eld surface-plasmon activated device (SPADE) fabricated on an optic "ber, and demonstrate large transmission through a subwavelength aperture. 2000 Elsevier Science B.V. All rights reserved.
Middle-infrared transmission enhancement through periodically perforated metal films
Applied Physics Letters, 2004
Noble metals such as gold and silver have been extensively used for plasmonic applications due to their ability to support plasmons, yet they suffer from high intrinsic losses. Alternative plasmonic materials that offer low loss and tunability are desired for a new generation of efficient and agile devices. In this paper, atomic layer deposition (ALD) grown ZnO is investigated as a candidate material for plasmonic applications. Optical constants of ZnO are investigated along with figures of merit pertaining to plasmonic waveguides. We show that ZnO can alleviate the trade-off between propagation length and mode confinement width owing to tunable dielectric properties. In order to demonstrate plasmonic resonances, we simulate a grating structure and computationally demonstrate an ultra-wide-band (4-15 μm) infrared absorber.
Extraordinary optical transmission through metal films with sub wavelength holes and slits
2010
Continuous films of metals like gold and silver with a thickness of a few tens of nm have poor optical transmission in the visible and infrared. However, the same films become largely transparent when the transmission is mediated by coupled surface plasmon polaritons on the two surfaces of the film. Likewise, it is expected that optical transmission through a hole
Nearly zero transmission through periodically modulated ultrathin metal films
Transmission of light through an optically ultrathin metal film with a thickness comparable to its skin depth is significant. We demonstrate experimentally nearly-zero transmission of light through a film periodically modulated by a one-dimensional array of subwavelength slits. The suppressed optical transmission is due to the excitation of surface plasmon polaritons and the zero-transmission phenomenon is strongly dependent on the polarization of the incident wave.
Extraordinary Transmission of Metal Films with Arrays of Subwavelength Holes
Annual Review of Physical Chemistry, 2008
Metal films with patterns of subwavelength holes (grids or meshes) have interesting optical properties including the extraordinary transmission effect. These optically thick metal films transmit more radiation than that incident on the holes owing to the excitation of surface plasmons (SPs). Meshes present a new and simple way to excite SPs at perpendicular incidence (i.e., without the need to vary the angle of the incident beam). This represents a new opportunity to integrate SPs with experiments and devices-a new instrument in the toolbox of SP techniques that may broaden the range of SP applications. This review discusses the discovery, basic optical physics, the role of SPs, and applications of the extraordinary transmission of subwavelength hole arrays.
Optics Express, 2005
The optical transmission through a subwavelength aperture in a metal film is strongly enhanced when the incident light is resonant with surface plasmons at the corrugated metal surface surrounding the aperture. Conversely, the aperture acts as a novel probe of the surface plasmons, yielding useful insights for optimizing the transmission enhancement. For the optimal corrugation geometry, a set of concentric circular grooves, three times more light is transmitted through the central subwavelength aperture than directly impinges upon it. This effect is useful in the fabrication of near-field optical devices with extremely high optical throughput.
Physical Review B, 2008
We theoretically and numerically studied the transmission of light through a subwavelength-perforated metal film, as well as through a homogeneous metal film with a Drude ac conductivity tensor, in the presence of a static magnetic field. Both the perforated and the homogeneous metal films are found to exhibit a magnetoinduced light transparency and a decreasing reflectivity due to cyclotron resonance. In particular, the cyclotron resonance and the surface plasmon resonance of the perforated metal film move to higher frequencies with increasing magnetic field, bringing about large changes in the extraordinary light transmission peaks predicted to occur in such a film. The practical possibility of changing the sample transparency by application of a static magnetic field is discussed.