Resonant Transmission of Light Through Finite Chains of Subwavelength Holes in a Metallic Film

Departamento de Física Teórica de la Materia Condensada, Universidad Autónoma de Madrid, E-28049 Madrid, Spain.
Physical Review Letters (Impact Factor: 7.51). 12/2004; 93(22):227401. DOI: 10.1103/PhysRevLett.93.227401
Source: arXiv


In this Letter we show that the extraordinary optical transmission phenomenon found before in 2D hole arrays is already present in a linear chain of subwavelength holes, which can be considered as the basic geometrical unit showing this property. In order to study this problem, we have developed a new theoretical framework, able to analyze the optical properties of finite collections of subwavelength apertures and/or dimples (of any shape and placed in arbitrary positions) drilled in a metallic film.

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    • "The amplitude transmission increases logarithmically when the array thickness is above the critical thickness and below 100 nm. It then saturates gradually and approaches the maximum at the film thickness of one skin depth [24] "
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    Full-text · Article · Jan 2013 · IEEE Journal of Selected Topics in Quantum Electronics
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    • "For instance, greatly enhanced NFL can be realized by SP resonance in a two-dimensional (2D) array of holes on aluminum film [7]. In NFL, although transmission of transversal magnetic (TM) polarized light is high for subwavelength grating-like metallic apertures [8] [9] [10], optical transmission through isolated subwavelength features (slit or dot) is very low [11]. Therefore, it is difficult to yield uniform lithography patterns when arrayed and isolated subwavelength apertures coexist on the lithography mask, because light transmission through these two kinds of apertures is quite different. "
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    • "Indeed, periodicity along the -direction is not required for the observation of enhanced transmission peaks. For instance, in [39] "
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    ABSTRACT: Extraordinary optical transmission of light or electromagnetic waves through metal plates periodically perforated with subwavelength holes has been exhaustively analyzed in the last ten years. The study of this phenomenon has attracted the attention of many scientists working in the fields of optics and condensed matter physics. This confluence of scientists has given rise to different theories, some of them controversial. The first theoretical explanation was based on the excitation of surface plasmons along the metal-air interfaces. However, since periodically perforated dielectric (and perfect conductor) slabs also exhibit extraordinary transmission, diffraction by a periodic array of scatterers was later considered as the underlying physical phenomenon. From a microwave engineering point of view, periodic structures exhibiting extraordinary optical transmission are very closely related to frequency-selective surfaces. In this paper, we use simple concepts from the theory of frequency-selective surfaces, waveguides, and transmission lines to explain extraordinary transmission for both thin and thick periodically perforated perfect conductor screens. It will be shown that a simple transmission-line equivalent circuit satisfactorily accounts for extraordinary transmission, explaining all of the details of the observed transmission spectra, and easily gives predictions on many features of the phenomenon. Although the equivalent circuit is developed for perfect conductor screens, its extension to dielectric perforated slabs and/or penetrable conductors at optical frequencies is almost straightforward. Our circuit model also predicts extraordinary transmission in nonperiodic systems for which this phenomenon has not yet been reported.
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