Strong Polarization in the Optical Transmission through Elliptical Nanohole Arrays

Gordon, Reuven; Brolo, Alexandre G.; McKinnon, Alan E.; Rajora, A.; Leathem, B.; Kavanagh, K. L.

doi:10.1103/physrevlett.92.037401

Cited by 463 publications

(303 citation statements)

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“…[1][2][3][4][5][6][7][8][9][10] Recent works have experimented with the effects on transmission that arise from changing the hole shape. [11][12][13] The main findings of those works is that elliptical or rectangular holes can dramatically influence the polarization, the resonance wavelength, and the intensity of the transmission. Random arrays of rectangular holes were used to demonstrate that a resonance exists in the transmission spectrum which is governed by the shape of the individual hole.…”

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Transmission of light through a single rectangular hole in a real metal

et al. 2006

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A theory is presented to describe the optical transmission through a rectangular hole in a real metal film. The previous theory of the transmission through a rectangular hole in a perfect electric conductor is extended to include the effects associated with having a real metal by adding surface-impedance boundary conditions and an effective index mode calculation. Both the peak and amplitude of the Fabry-Pérot resonance of the fundamental mode agree quantitatively with experiments. Finite-difference time-domain calculations are used to verify the theoretical findings as well as to show the effects of including loss, which is not included in the theory. The localized nature of the transmission resonances is also revealed by analyzing the electric field maps associated with the enhanced transmission process. DOI: 10.1103/PhysRevB.74.153411 PACS number͑s͒: 78.66.Bz, 42.25.Bs, 41.20.Jb, 42.79.Ag Observations of extraordinary optical transmission through arrays of subwavelength holes in metal films have spurred on intense research activity into understanding and utilizing this phenomenon. 1-10 Recent works have experimented with the effects on transmission that arise from changing the hole shape. [11][12][13] The main findings of those works is that elliptical or rectangular holes can dramatically influence the polarization, the resonance wavelength, and the intensity of the transmission. Random arrays of rectangular holes were used to demonstrate that a resonance exists in the transmission spectrum which is governed by the shape of the individual hole. 12 The peak wavelength of the resonance could be redshifted by decreasing the width of the short side of the hole. On the other hand, recent studies on isolated rectangular holes have shown the same effects of a resonance in transmission and a redshift that arises when reducing the width of the hole. 14 To explain how the shape-controlled resonance wavelength arises from a single hole, the influence of the hole shape on the cutoff wavelength of the modes within the hole was considered. 15 It was shown that the cutoff wavelength increases for a real metal due to increased coupling between evanescent fields on the long edges inside the hole. Later, the origin of the resonance was explained with a theory that incorporated the coupling between the mode inside the hole with the free-space regions on either side of the film. 16 The physical nature of this effect was attributed to a Fabry-Pérot resonance due to multiple reflections of the mode within the hole at the interfaces with the free-space regions. That theory did not capture the observed redshift phenomenon that arises when the width of the hole is reduced in a real metal because it considered only a perfect electric conductor.In this paper, a theory that describes quantitatively the transmission resonance for a rectangular hole in a metal film is presented. Here, the previous theory has been generalized to allow for a finite dielectric constant, and thereby captures the new physics associated with having a real ...

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Transmission of light through a single rectangular hole in a real metal

et al. 2006

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“…Polarization properties of nanohole arrays have been studied in many works [10,11,12]. Recently, orbital angular momentum of photons were explored to investigate the spatial mode properties of surface plasmon assisted transmission [13,14].…”

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Influence of unsymmetrical periodicity on extraordinary transmission through periodic arrays of subwavelength holes

Ren

Guo

Huang

et al. 2007

Applied Physics Letters

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Quadrate hole array is explored to study the influence of unsymmetrical periodicity on extraordinary optical transmission through periodic arrays of subwavelength holes. It is found that the transmission efficiency of light and the ratio between transmission efficiencies of horizontal and vertical polarized light can be continuously tuned by rotating the quadrate hole array. We can calculate out the transmission spectra (including the heights and locations of peaks) for any rotation angle θ with a simple theoretical model. PACS number(s):

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“…The large confinement and concomitant field enhancement of light that was necessary to explain the large transmission through hole arrays, as observed in the original experiment came as a large surprise, certainly as up to that point, the transmission through subwavelength holes had been considered a very inefficient process [3]. Soon after the discovery of the remarkable transmission properties of hole arrays, the important role of hole shape became apparent in several investigations [4][5][6]. This made it all the more clear that the role of the hole as a scatterer and a transmission channel for the light was not well understood.…”

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Local investigation of the optical properties of subwavelength rectangular holes with a focused beam of electrons

Prangsma

Oosten

Kuipers

2011

Phil. Trans. R. Soc. A.

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The optical properties of rectangular subwavelength holes in a gold film are investigated using the light generated when a focused beam of electrons impinges on the sample close to the hole. Using this technique, multi-spectral maps of the holes are obtained with a resolution beyond the optical diffraction limit. The results show the influence of hole shape on the spectrum of locally scattered light. Rectangular holes of varying shape and size are investigated, and the spatial distribution of the polarization of the observed light is measured. The influence of neighbouring holes is investigated by measuring small clusters of holes.

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Strong Polarization in the Optical Transmission through Elliptical Nanohole Arrays

Cited by 463 publications

References 17 publications

Transmission of light through a single rectangular hole in a real metal

Transmission of light through a single rectangular hole in a real metal

Influence of unsymmetrical periodicity on extraordinary transmission through periodic arrays of subwavelength holes

Local investigation of the optical properties of subwavelength rectangular holes with a focused beam of electrons

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