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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 4 — Feb. 13, 2012
  • pp: 4697–4709
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Long vs. short-range orders in random subwavelength hole arrays

Frédéric Przybilla, Cyriaque Genet, and Thomas W. Ebbesen  »View Author Affiliations


Optics Express, Vol. 20, Issue 4, pp. 4697-4709 (2012)
http://dx.doi.org/10.1364/OE.20.004697


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Abstract

We analyze the progressive introduction of disorder in periodic subwavelength hole arrays. Two models of disorder are discussed from their associated Fourier transforms and correlation functions. The optical transmission properties of the corresponding arrays are closely related with the evolutions of structure factors, as experimentally detailed. Remarkably, the optical properties of random arrays are not in general equal to those of the single hole as a result of short-range correlations corresponding to hole-to-hole interactions. These correlations are due to packing constraints that are controlled through the careful generation of random patterns. For high density pattern, short-range order can take over long-range order associated with the periodic array.

© 2012 OSA

1. Introduction

2. From periodic to random arrays

All our structures (single hole and hole arrays) are milled with a Focused Ion Beam through the same 275 nm thick Au film, sputtered on a glass substrate. Prior to optical measurements the structures have been covered with an index matching liquid tuned to the refractive index of the glass substrate (n ≈ 1.5). All the structures were thus in a symmetric configuration (refractive index of the dielectric media on both sides of the film is the same). Measuring the absolute optical transmission spectrum through a single subwavelength hole needs specific techniques that have been detailed elsewhere [12

12. F. Przybilla, A. Degiron, C. Genet, T. W. Ebbesen, F. de Léon-Pérez, J. Bravo-Abad, F. J. García-Vidal, and L. Martín-Moreno, “Efficiency and finite size effects in enhanced transmission through subwavelength apertures,” Opt. Express 16, 9571–9579 (2008). [CrossRef] [PubMed]

]. We have implemented them both for single holes and random hole distributions. We insist on the fact that the greatest care was taken to keep the geometrical parameters of each hole as much identical as possible in all types of structures studied. This can be checked looking at our scanning electron microscopy (SEM) images on Figs. 1, 4 and 6.

Fig. 1 SEM images of two-dimensional arrays of sub-wavelength holes with increasing degree of disorder (only the top left quarter of each structure is displayed). Starting from a N = 900 holes periodic array (a) disorder is introduced by moving R = 300 holes (b), R = 600 holes (c) and R = 900 holes (d) around their original position in a sub-unit cell of size χ = 300 nm. Alternatively, we move all the holes by increasing the amplitude of the displacement, χ = 100 nm (e), χ = 200 nm (f), χ = 300 nm (g) and χ = 450 nm (h). For each case, we also show the associated Fourier spectrum Imax(k) = max(I(k)) and pair correlation function g(r).

Fig. 2 (a) Transmission spectra of two-dimensional arrays of sub-wavelength hole with increasing degree of disorder. Disorder is introduced by moving R = 0 to 900 holes from their initial position with χ = 300 nm (local disorder). (b) All the holes are displaced from their initial position, amplitude of the displacement is increased from χ = 0 to 500 nm (global disorder). As a reference the spectrum of a single aperture having the same dimensions as the holes within the random arrays is also represented (thick grey line). (c) Intensity of the first peak of the numerical Fourier transform of the different structures as a function of the degree of disorder D. (d) Efficiency of EOT as a function of D and evolution of the SP propagation length SP. This length is evaluated as SP=λres2/(2πnSPFWHM) from the FWHM of the transmission resonance peaked at λres and the associated SP index nSP=[ɛmɛd/ɛm+ɛd], with ɛm and ɛd the respective dielectric constants of the metal and dielectric media. Note that the spectra of the arrays with D > 0.45 were too broad to extract FWHM with enough confidence.

Random arrays are generated by positional disorder as holes are moved from their initial lattice positions on the initial periodic array. The displacement is restricted to a specified area χ2, homothetic with the array unit cell, the size of which defines a maximal shift χ/2. A minimal hard spheres-type separation distance σ between the holes (from center to center) is simultaneously set, in order to avoid adjacent holes overlapping. Fabrication issues fix edge to edge distances at a minimum of 75 nm which we slightly increase to 90 nm for precaution. For apertures of diameter d = 160 nm, this then corresponds to a minimal center to center distance σ = 250 nm. Random arrays are thus characterized by the two relevant parameters, the minimal distance σ between the holes and the density of holes per unit of area ρ.

3. Models of disorder

Two different models of positional disorder are implemented. In a first local model, we fix a maximum shift to χ/2 by which we move R holes in a random orientation an increasing way. We go from a defect-free periodic array (period fixed at p = 450 nm) with R = 0 to a fully shifted array with R = N, where N is the total number of holes. For the case studied, we choose χ = 300 nm. As a second model, corresponding to global disorder, we move all the holes by increasing values of χ. Note that in these conditions the hole density is ρ ≈ 9.9 % and σ is fixed to 250 nm for all the structures. Generating the arrays, we make sure that the distribution of hole displacements giving disorder is uniform through the displacement cell.

SEM images of the fabricated structures with local disorder (top row) and global disorder (bottom row) are shown in Fig. 1. From the known positions of each hole, we numerically evaluate Fourier transforms (FT) associated with the arrays. The progressive reduction of the amplitude of the Fourier components displayed in Fig. 1 is a measure of the increase of disorder. In the case of local disorder we note that the information of periodicity is not totally lost, as a Fourier peak remains. This is not surprising since in this case we did not allow the holes to go outside of their initial unit cell (χ < p). For global disorder in contrast, as soon as χ = p, periodicity is lost and no peak appear anymore on the Fourier spectrum.

That these two models induce different types of disorder cannot be assessed from a sole Fourier analysis, as it is seen from Fig. 1. But the difference becomes clear using hole-to-hole correlation functions. These functions can be directly evaluated from the holes coordinates as
g(r)=12πrNρNi=1Nj=1,jiN{0ifr|rirj|121if12<r|rirj|120if12<r|rirj|
(2)
with ρN = 4ρ/(πd2) the hole-number density, ri and rj the coordinates of the ith and jth holes. Note that these functions can also be directly evaluated from the structure factor according to the Wiener-Khinchin theorem.

In the case of the periodic lattice (Fig. 1(a)), pair distances are limited to the lattice vectors, and the correlation function is a sum of peaks at the lattice sites. When introducing disorder in a local model, the averaging over all directions reduces the peak amplitudes and induces a uniform continuum that increases towards one as R is increased. At R = N, any pair distance becomes equally probable and the memory of the periodicity only remains as a weak modulation of the continuum. In the case of global disorder, the evolution is very different with a dramatic broadening of the correlation peaks and an extended continuum, smearing out the peaks of the correlation function at large distance, as expected for a truly random system.

The transmission spectra associated with each disordered arrays are measured and gathered in Fig. 2. All the spectra presented in this paper are normalized to area occupied by the holes. We will compare them together by defining the degree of disorder D as a surface ratio with D = (R/N) × (χ/p)2 in order to comply with the bi-dimensionality of our problem.

As clear from Figs. 2(a) and 2(b), both types of disorder lead to similar spectral evolutions regarding peak intensity reduction and peak width increase. Note that a progressively less pronounced spectral dip together with a slight blue shift of the resonance position is a typical signature for a global reduction of the SP contribution in the transmission process with respect to the direct contribution through the holes. Looking at the intensity evolution of the first FT peak (located at k = Gi=1,j=0) as a function of D (Fig. 2(c)) reveals how close both models of disorder are in terms of Fourier transforms. Similarly close evolutions are observed in Fig. 2(d) for the measured resonance intensities and widths, for both types of experiments. In order to get consistent values, we normalized each spectrum T of each array by the spectrum TSH of the single hole. This ratio corresponds to the relative efficiency of EOT [12

12. F. Przybilla, A. Degiron, C. Genet, T. W. Ebbesen, F. de Léon-Pérez, J. Bravo-Abad, F. J. García-Vidal, and L. Martín-Moreno, “Efficiency and finite size effects in enhanced transmission through subwavelength apertures,” Opt. Express 16, 9571–9579 (2008). [CrossRef] [PubMed]

] and we extracted the full width at half maxima (FWHM) of these sets of data by considering T/TSH = 1 as the base line. Propagation length SP for the SP modes are evaluated from the FWHM considering an exponential decay of SP on the structure. As it clearly appears from the data, local and global models are indistinguishable, reinforcing the relation between structure factor and optical resonances of subwavelength hole arrays [6

6. J. Bravo-Abad, A. I. Fernández-Domínguez, F. J. García-Vidal, and L. Martín-Moreno, “Theory of extraordinary transmission of light through quasiperiodic arrays of subwavelength holes,” Phys. Rev. Lett. 99, 203905 (2007). [CrossRef]

, 16

16. F. Przybilla, C. Genet, and T. W. Ebbesen, “Enhanced transmission through Penrose subwavelength hole arrays,” Appl. Phys. Lett. 89, 121115 (2006). [CrossRef]

].

Interesting too is the fact that as the disorder increases, the FWHM increases and SP decreases. The broadening stems from the fact that as disorder is introduced from the periodic situation, the structure factor becomes non-zero for wave vectors smaller than the minimal reciprocal vector of the initial periodic lattice (this can be seen on the FT displayed in Fig. 1), opening new diffractive channels that correspond to additional scattering loss for the surface wave excited over the array [6

6. J. Bravo-Abad, A. I. Fernández-Domínguez, F. J. García-Vidal, and L. Martín-Moreno, “Theory of extraordinary transmission of light through quasiperiodic arrays of subwavelength holes,” Phys. Rev. Lett. 99, 203905 (2007). [CrossRef]

]. In other words, the structure factor itself influences the propagation length of the SP modes which indeed decreases from c.a. 2 μm to less than 1 μm for the D = 0.45 disordered arrays (Fig. 2(d)). This reduction in the propagation length should not be confused with some inhomogeneous broadening [4

4. N. Papasimakis, V. A. Fedotov, Y. Fu, D. P. Tsai, and N. I. Zheludev, “Coherent and incoherent metamaterials and the order-disorder transitions,” Phys. Rev. B 80, 041102(R) (2009). [CrossRef]

], since here the individual scatterer, the single subwavelength hole, is intrinsically a poorly resonant element of the system, in contrast to nanoparticles in random arrays [5

5. B. Auguié and W. L. Barnes, “Diffractive coupling in gold nanoparticle arrays and the effect of disorder,” Opt. Lett. 34, 401–403 (2009). [CrossRef] [PubMed]

].

4. Debye-Waller factor

The close relation between the structure factors and the optical transmission spectra can be further illustrated by following the evolution of the ratio between the relative efficiency of EOT and the peak amplitude in the calculated FT. This compared evolution is presented in Fig. 3(a). For small amounts of disorder, namely D < 0.3, the ratio is nearly constant: the intensity of the transmission peak, which is a measure of the efficiency of the EOT, is directly proportional to the intensity of the corresponding peak in the calculated FT.

Fig. 3 (a) Ratio of the relative efficiency of EOT to the intensity of the associated Bragg peak on the Fourier spectrum. (b) Efficiency of EOT and intensity of the first Bragg peak on the Fourier spectrum as a function of the mean square displacement of the holes from their initial position in the periodic array. Also represented is the Debye Waller law (dashed line) evaluated for Gi=1,j=0. Note that D and 〈δ2〉 are proportional up to 〈δ2〉 = 15·10−3 μm2.

5. Single hole and random arrays: short-range order effects

We will focus on the influence of short-range order over these interactions rather than their nature. This influence is observed in the transmission spectra of random arrays as deviations from the spectral signature of a single hole.

Fig. 4 SEM images of random hole arrangements generated for increasing value of σ: (a) σ = 250 nm (ρ ≈ 7.5%), (b) σ = 450 nm (ρ ≈ 2.3%) and (c) σ = 650 nm (ρ ≈ 1.2%). The average hole density per surface area (ρ) was chosen to be equal to a third of the maximum value achievable given the geometrical constraints imposed by σ. The apertures have all the same dimensions (d = 160 nm). Numerical Fourier transforms of the random arrays are also represented. The scale and images contrast are the same in the different panels. (d) SEM images of single apertures milled in the same Au film (t = 275 nm) having the same dimension as the holes within the random arrays. The magnified SEM images display two isolated single apertures with identical geometrical parameters. The white ring surrounding the apertures on the SEM images denotes the rounded edge of the holes.
Fig. 5 Transmission spectra of random hole arrangements generated for increasing values of σ. The data correspond to the geometrical parameters presented in Fig. 4. As a reference the spectrum of a single aperture having the same dimensions as the holes within the random arrays is also represented (thick grey line). The spectrum of the single hole corresponds to an average of the spectrum of two different isolated single apertures (see Fig. 4(d)).
Fig. 6 SEM images of compact random hole arrangements generated for increasing value of σ: (a) σ = 250 nm (ρ ≈ 22.6 %), (b) σ = 300 nm (ρ ≈ 15.8 %), (c) σ = 350 nm (ρ ≈ 11.7 %) and (d) σ = 400 nm (ρ ≈ 9.2 %). The average hole density per surface area ρ was chosen to be equal to the maximum value allowed by the constraint imposed by σ. The apertures have all the same dimensions (d = 160 nm). Numerical Fourier transforms of the random arrays are also represented. These diffraction spectra allow to identify short-range order in the arrays (concentric rings). Radial averaged cross sections allow to easily visualise the frequencies of the inner rings, which clearly correspond to the parameter σ. The scale and the images contrast are the same as in Fig. 4.

In order to probe the influence of short-range order, we perform two sets of experiment in two very different ranges of averaged hole density ρ. A first set aims at minimizing the effects of short-range order by generating random arrays with low densities of holes. In contrast, a second set aims at looking at random arrays with high-densities of holes. The maximal hole density ρmax achievable on a random hole array in a given window is fixed by the minimal hole separation σ, which acts as the essential packing constraint. We study systematically the influence of σ on the spectral response of the structures to reveal the influence of short-range order. Therefore, for each value of σ we generate an array with ρ = ρmax/3 (first set of experiment: low density) and an array with ρ = ρmax (second set of experiment: high density).

The first set consists in generating arrays by positioning randomly apertures in a square window of about 13 × 13 μm2 (see SEM images in Fig. 4). This is done in such a way that no particular spatial frequency dominates the spectrum, as it can be checked from the uniformity of the calculated FT associate with each pattern (see Fig. 4). Transmission spectra are given in Fig. 5, for increasing values of σ from 250 to 850 nm (steps of 50 nm) and thus decreasing values of ρ. For clarity, only a half number of the spectra are displayed, the other ones showing the same trends. From the reference provided by the single hole spectrum, we immediately observe that the hole array spectra are close to the single hole spectrum, particularly for the largest values of σ (σ = 750 nm in Fig. 5). In this case, the transmission properties of a random hole array can be considered as being close to the sum of the independent contribution of single isolated holes. Note however that even at this large σ value, small ripples on the random hole array spectrum reveal deviations from the spectrum of the single hole. These differences increase as σ decreases and witness interactions between the holes within the random pattern. Similar ripples are also visible on the transmission spectrum presented in other studies [19

19. K. J. K. Koerkamp, S. Enoch, F. B. Segerink, N. F. van Hulst, and L. Kuipers, “Strong influence of hole shape on extraordinary transmission through periodic arrays of subwavelength holes,” Phys. Rev. Lett. 92, 183901 (2004). [CrossRef] [PubMed]

,20

20. K. L. van der Molen, K. J. K. Koerkamp, S. Enoch, F. B. Segerink, N. F. van Hulst, and L. Kuipers, “Role of shape and localized resonances in extraordinary transmission through periodic arrays of subwavelength holes: experiment and theory,” Phys. Rev. B 72, 045421 (2005). [CrossRef]

]. As discussed earlier [21

21. M. C. Hughes and R. Gordon, “Optical transmission properties and enhanced loss for randomly positioned apertures in a metal film,” Appl. Phys. B 87, 239–242 (2007). [CrossRef]

] and recently measured [10

10. F. van Beijnum, C. Rétif, C. B. Smiet, and M. P. van Exter, “Transmission processes in random patterns of subwavelength holes,” Opt. Lett. 36, 3666–3668 (2011). [CrossRef] [PubMed]

,22

22. C. Sönnichsen, A. C. Duch, G. Steininger, M. Koch, G. von Plessen, and J. Feldmann, “Launching surface plasmons into nanoholes in metal films,” Appl. Phys. Lett. 76, 140–142 (2000). [CrossRef]

24

24. P. Lalanne, J. P. Hugonin, and J. C. Rodier, “Theory of surface plasmon generation at nanoslit apertures,” Phys. Rev. Lett. 95, 263902 (2005). [CrossRef]

], these modulations can be attributed to local resonances between adjacent apertures.

The array with σ = 250 nm shows the largest deviation. It corresponds also to the structure with the highest hole density (ρ ≃ 7.5%), high enough to put constraints on the random draw of the positions of holes in the given area of the square window. The second set of experiments explicitly probes such constraints by generating random hole arrangements with a maximum value of ρ within the constraints limit imposed by σ. Apart from the hole density parameter, all arrays of this second set are generated using the same protocol as the first set.

The spectra of these compact random hole arrays are gathered in Fig. 7 together with the transmission spectrum of a single hole. Just like in Fig. 5 for low density random patterns, ripples are observed on the spectra for arrays with σ > 450 nm. In contrast, transmission spectra of compact random hole arrays display a broad resonance which is absent from the spectrum of the single hole. Through the structure factor, i.e. from a momentum transfer argument, we naturally relate this resonance to the spatial frequencies emerging on the FT as the hole density is increased. We are thus extending to random arrays the Fourier-based analysis implemented in periodic and quasi-crystalline arrays [6

6. J. Bravo-Abad, A. I. Fernández-Domínguez, F. J. García-Vidal, and L. Martín-Moreno, “Theory of extraordinary transmission of light through quasiperiodic arrays of subwavelength holes,” Phys. Rev. Lett. 99, 203905 (2007). [CrossRef]

, 16

16. F. Przybilla, C. Genet, and T. W. Ebbesen, “Enhanced transmission through Penrose subwavelength hole arrays,” Appl. Phys. Lett. 89, 121115 (2006). [CrossRef]

]. The important observation that the position of the (broad) peaks evolves as σ is varied from 250 to 850 nm is detailed in the inset of Fig. 7 where the positions of the transmission resonance are compared to the spatial frequencies dominating the FT of the random patterns (black dots). These data are also compared to the surface plasmon dispersion relation on a smooth metal-dielectric interface (continuous line). In the small wavelength range studied, this confirms that the resonance follows the same tendency as the one observed for periodic arrays [14

14. F. Przybilla, A. Degiron, J. Y. Laluet, C. Genet, and T. W. Ebbesen, “Optical transmission in perforated noble and transition metal films,” J. Opt. A: Pure Appl. Opt. 8, 458–463 (2006). [CrossRef]

]. Typical red-shifts are measured, associated with the interference between the direct and indirect contributions to the transmission process. Also, due to the extension of the spatial spectrum of the structure factor, the resonances observed on the transmission spectrum of the compact random hole arrays are very broad and do not show characteristic strong minima and dissymmetric peak profiles of enhanced transmission peaks of periodic hole arrays.

Fig. 7 Transmission spectra of random hole arrays generated with increasing values of the minimum hole separation (σ). These data correspond to the geometrical parameters presented in Fig. 6 (arrays with maximum hole density). As a reference the spectrum of a single aperture having the same dimension as the holes within the random arrays is also represented (thick grey line). (Inset) Evolution of the positions of the resonance (black dots) observed on the experimental spectra of the compact random hole arrays as a function of the spatial frequencies krandom dominating the numerical FT shown in Fig. 6 (note that krandom ≈ 2π/σ). These positions are compared to the positions λres estimated from the SP coupling condition (continuous line) considering the spectral structure of the Fourier transform of the random arrays (krandom = kSP with kSP = nSP · 2π/λres).

Hence associated to short-range order, the broad resonances observed in Fig. 7 must involve rather localized surface waves. This can be indirectly checked by studying the evolution of the transmission spectrum as a function of the number of holes N, for fixed values of σ and ρ. For this purpose we fabricated and characterized random hole arrays covering a square window of increasing size (composed by an increasing number of holes). As can be seen on Fig. 8, the spectra of the random hole arrangements do not evolve as N increases. The only small fluctuations of intensity are attributed to local variation of the density of hole within the generated random pattern. These fluctuations have not been taken into account in our normalization. Indeed our measurement scheme only analyzes a fraction of the light transmitted by the structures, limited by the entrance slit of the spectrometer which intercepts a slice of the structure. As a consequence, the size of the investigated zone is proportional to the size of the structure. Therefore, the intensities of the transmission spectra of the smallest structures are particularly sensitive to the local variation of the hole density as these local variations will not be averaged on a large area. As N increases, the measured spectral intensities converge to an average value: the two largest pattern (N = 900 and 1600 holes) have globally the same transmission spectra. Given that these two different structures of identical hole density have been generated independently, the spectral similarity confirms again that the spectral response of compact random hole arrangements is essentially determined by the minimal hole separation σ.

Fig. 8 Transmission spectra of random hole arrays having increasing number of holes (N) of constant diameter d = 160 nm. The average hole density has been kept constant (ρ ≈ 10.6 %) with a minimal hole separation σ = 250 nm. Note that the different structures have been generated independently. As a reference the spectrum of a single aperture having the same dimension as the holes within the random arrays is also represented (thick grey line).

In the case of periodic arrays, the long-range order becomes better and better defined as the number of periods increases (i.e. the number of holes). In the case of random hole arrays, it is the short-range order that improves as hole density increases. Nevertheless, this short-range order is limited by the minimal hole separation σ.

6. Conclusion

Acknowledgments

The authors gratefully acknowledge financial support from the European Research Council (ERC grant no. 227577).

References and links

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D. Nau, A. Schönhardt, C. Bauer, A. Christ, T. Zentgraf, J. Kuhl, and H. Giessen, “Disorder issues in metallic photonic crystals,” Phys. Status Solidi B 243, 231–2343 (2006). [CrossRef]

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F. J. García-Vidal, L. Martín-Moreno, T. W. Ebbesen, and L. Kuipers, “Light passing through subwavelength apertures,” Rev. Mod. Phys. 82, 729–787 (2010). [CrossRef]

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F. Przybilla, A. Degiron, C. Genet, T. W. Ebbesen, F. de Léon-Pérez, J. Bravo-Abad, F. J. García-Vidal, and L. Martín-Moreno, “Efficiency and finite size effects in enhanced transmission through subwavelength apertures,” Opt. Express 16, 9571–9579 (2008). [CrossRef] [PubMed]

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D. S. Kim, S. C. Hohng, V. Malyarchuk, Y. C. Yoon, Y. H. Ahn, K. J. Yee, J. W. Park, J. Kim, Q. H. Park, and C. Lienau, “Microscopic origin of surface-plasmon radiation in plasmonic band-gap nanostructures,” Phys. Rev. Lett. 91, 143901 (2003). [CrossRef] [PubMed]

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F. Przybilla, A. Degiron, J. Y. Laluet, C. Genet, and T. W. Ebbesen, “Optical transmission in perforated noble and transition metal films,” J. Opt. A: Pure Appl. Opt. 8, 458–463 (2006). [CrossRef]

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J. Bravo-Abad, A. Degiron, F. Przybilla, C. Genet, F. J. García-Vidal, L. Martín-Moreno, and T. W. Ebbesen, “How light emerges from an illuminated array of subwavelength holes,” Nat. Phys. 2, 120–123 (2006). [CrossRef]

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A. Y. Nikitin, F. J. García-Vidal, and L. Martín-Moreno, “Surface electromagnetic field radiated by a subwavelength hole in a metal film,” Phys. Rev. Lett. 105, 073902 (2010). [CrossRef] [PubMed]

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H. A. Bethe, “Theory of diffraction by small holes,” Phys. Rev. 66, 163–182 (1944). [CrossRef]

19.

K. J. K. Koerkamp, S. Enoch, F. B. Segerink, N. F. van Hulst, and L. Kuipers, “Strong influence of hole shape on extraordinary transmission through periodic arrays of subwavelength holes,” Phys. Rev. Lett. 92, 183901 (2004). [CrossRef] [PubMed]

20.

K. L. van der Molen, K. J. K. Koerkamp, S. Enoch, F. B. Segerink, N. F. van Hulst, and L. Kuipers, “Role of shape and localized resonances in extraordinary transmission through periodic arrays of subwavelength holes: experiment and theory,” Phys. Rev. B 72, 045421 (2005). [CrossRef]

21.

M. C. Hughes and R. Gordon, “Optical transmission properties and enhanced loss for randomly positioned apertures in a metal film,” Appl. Phys. B 87, 239–242 (2007). [CrossRef]

22.

C. Sönnichsen, A. C. Duch, G. Steininger, M. Koch, G. von Plessen, and J. Feldmann, “Launching surface plasmons into nanoholes in metal films,” Appl. Phys. Lett. 76, 140–142 (2000). [CrossRef]

23.

H. F. Schouten, N. Kuzmin, G. Dubois, T. D. Visser, G. Gbur, P. F. A. Alkemade, H. Blok, G. W. ’t Hooft, D. Lenstra, and E. R. Eliel, “Plasmon-assisted two-slit transmission: Young’s experiment revisited,” Phys. Rev. Lett. 94, 053901 (2005). [CrossRef] [PubMed]

24.

P. Lalanne, J. P. Hugonin, and J. C. Rodier, “Theory of surface plasmon generation at nanoslit apertures,” Phys. Rev. Lett. 95, 263902 (2005). [CrossRef]

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J. Prikulis, P. Hanarp, L. Olofsson, D. Sutherland, and M. Käll, “Optical spectroscopy of nanometric holes in thin gold films,” Nano Lett. 4, 1003–1008 (2004). [CrossRef]

OCIS Codes
(050.1220) Diffraction and gratings : Apertures
(050.1960) Diffraction and gratings : Diffraction theory
(050.2770) Diffraction and gratings : Gratings
(240.6680) Optics at surfaces : Surface plasmons
(050.6624) Diffraction and gratings : Subwavelength structures

ToC Category:
Diffraction and Gratings

History
Original Manuscript: December 21, 2011
Manuscript Accepted: January 20, 2012
Published: February 9, 2012

Citation
Frédéric Przybilla, Cyriaque Genet, and Thomas W. Ebbesen, "Long vs. short-range orders in random subwavelength hole arrays," Opt. Express 20, 4697-4709 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-4-4697


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References

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