Beam manipulating by metallic nano-slits with variant widths

Shi, Haofei; Wang, Changtao; Du, Chunlei; Luo, Xiangang; Dong, Xiaochun; Gao, Hongtao

doi:10.1364/opex.13.006815

Cited by 367 publications

(251 citation statements)

References 9 publications

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“…One of the superlenses consists of a silver film coating on glass with some corrugations [13]. Meanwhile, similar results were reported by other researchers [14][15][16][17]. They claimed that breaking the diffraction limit is possible by using plasmonic structures [18][19][20].…”

Section: Introductionsupporting

confidence: 66%

Near-field visualization of plasmonic lenses: an overall analysis of characterization errors

Wang¹,

Fu²,

Fang³

2016

Nano Online

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Many factors influence the near-field visualization of plasmonic structures that are based on perforated elliptical slits. Here, characterization errors are experimentally analyzed in detail from both fabrication and measurement points of view. Some issues such as geometrical parameter, probe-sample surface interaction, misalignment, stigmation, and internal stress, have influence on the final near-field probing results. In comparison to the theoretical ideal case of near-field probing of the structures, numerical calculation is carried out on the basis of a finite-difference and time-domain (FDTD) algorithm so as to support the error analyses. The analyses performed on the basis of both theoretical calculation and experimental probing can provide a helpful reference for the researchers probing their plasmonic structures and nanophotonic devices. 2069

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Section: Introductionsupporting

confidence: 66%

Near-field visualization of plasmonic lenses: an overall analysis of characterization errors

Wang¹,

Fu²,

Fang³

2016

Nano Online

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“…Additionally, the top surface of our antenna is flat, which may prove useful for many applications such as sensing. Furthermore, using both the gap plasmon dispersion relation and the metal mirrors allows us to provide a design that does not use an unrealistically small slit width 9 or very difficult fabrication procedures such as filling different slits with different dielectrics. 10 We start by studying one cavity by itself.…”

mentioning

confidence: 99%

Controlling the Phase and Amplitude of Plasmon Sources at a Subwavelength Scale

Lerosey¹,

Pile²,

Matheu³

et al. 2009

Nano Lett.

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We present a new class of nanoscale plasmonic sources based on subwavelength dielectric cavities embedded in a metal slab. Exploiting the strong dispersion near the Fabry-Perot resonance in such a resonator, we control the phase and the amplitude of the generated plasmons at the subwavelength scale. As an example, we present a subwavelength unidirectional plasmonic antenna utilizing interference between two plasmonic cavity sources with matched phase and amplitude.Surface plasmons polaritons (SPPs) are collective excitations of electrons coupled to an electromagnetic field at the interface between a dielectric and a metal.1 Their evanescent nature along the normal to the metal/dielectric interface allows subwavelength confinement that can be significantly smaller than diffraction limited optical waves in bulk media. SPPs, therefore, are ideal candidates for the construction of subwavelength optical devices. In the past few years, SPPs have also been identified to be the major physical mechanism involved in the extraordinary transmission of light (ETL) through metal films with subwavelength holes which was first reported by Ebbesen et al. 2,4 Subsequent studies have been made on uniform periodic arrays of holes, slits, and more complex shapes fabricated in metallic films. Those studies demonstrate that one can take advantage of the interference between plasmons generated on metal films by uniform periodic sources (e.g., slits or holes in metal films) to, for instance, focus or disperse light, 5,6 or realize ETL. Naturally, for flexible control and manipulation of light by such metal films it is necessary to evolve beyond the uniform periodic sources in refs 2-7 and introduce the rich possibilities afforded by nonuniform source films. When light enters a subwavelength dielectric structure in a metallic film, a significant fraction, if not all, of the light propagates through the film as surface plasmons that are confined at the metal/dielectric interfaces. For example, transverse magnetic (TM) polarized light impinging on a silver film containing air gaps gives rise to waves known as gap plasmons (GPs), whose properties are closely related to the dimensions of the gaps: the smaller the gap width, the larger the wavenumber of the GP. 11,12 This way, one can design sources of plasmons with arbitrary phase by adjusting the width of the gap. Similarly, one can fill the air gaps with different dielectrics hence inducing an optical path length between the generated plasmons. 8,10 Those two approaches are quite inflexible and practically hard to fabricate.In order to realize surface plasmon sources with chosen phase and amplitude, our approach utilizes the gap plasmon dispersion relation along with Fabry-Perot (FP) resonances in a cavity. 13,14 Air gaps in metal films typically display lowefficiency FP resonance 13 that, as we explain later, can be increased by introducing highly reflective "mirrors" on both sides of the metal film. Sharper resonance results in longer propagation of the GPs in the gaps due to con...

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“…However, efficient fabrication processes may benefit from keeping the film thickness fixed but tailoring alternate geometrical parameters of the holey metallic device. Shi et al first proposed a lens design based on an array of nanoslits which have constant depth but variant widths [33]. The variation of the slit width is associated with a change in the effective index of the transmitted field mode.…”

Section: Gradient-index Metalensesmentioning

confidence: 99%

Recent Progress in Far-Field Optical Metalenses

Naserpour¹,

Hashemi²,

Rodríguez³

2017

Metamaterials - Devices and Applications

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In this chapter, a review of the recent advances in optical metalenses is presented, with special emphasis in their experimental implementation. First, the Huygens' principle applied to ultrathin engineered metamaterials is introduced for the purpose of giving curvature to the wavefront of free-space wave fields. Primary designs based on metallic nanoslits and holey screens occasionally with variant width are first examined. Holographic plasmonic lenses are also explored offering a promising route to realize nanophotonic components. More recent metasurfaces based on nano-antenna resonators, either plasmonic or high-index dielectric, are analyzed in detail. Furthermore, 2D material lenses in the scale of a few nanometers enabling the thinnest lenses to date are here considered. Finally, dynamically reconfigurable focusing devices are reported for creating a scenario with new functionalities.

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Beam manipulating by metallic nano-slits with variant widths

Cited by 367 publications

References 9 publications

Near-field visualization of plasmonic lenses: an overall analysis of characterization errors

Near-field visualization of plasmonic lenses: an overall analysis of characterization errors

Controlling the Phase and Amplitude of Plasmon Sources at a Subwavelength Scale

Recent Progress in Far-Field Optical Metalenses

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