Plasmonic meta-slit: shaping and controlling near-field focus

Lee, Seung‐Yeol; Kim, Kyuho; Kim, Sun-Je; Park, Hyeonsoo; Kim, Kyoung-Youm; Lee, Byoungho

doi:10.1364/optica.2.000006

Cited by 103 publications

(71 citation statements)

References 33 publications

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“…We show that SPPs are excited and constructively interfere via a mechanism analogous to Cherenkov radiation, and we demonstrate that the rotation of the antennas makes the wake direction dependent on spin angular momentum, meaning that the direction of propagation of SPPs could in principle be reversed in real time by rotating a quarter waveplate to change the incident polarization from σ + to σ -. This demonstration of SPP wake generation and SPP steering can be further exploited to create new types of plasmonic couplers, such as plasmonic holograms 29 or directional lenses 30,31 . Besides connecting this coupling mechanism with the physics of the Cherenkov effect, our methodology could represent a unique and practical way to test concepts associated with fast travelling perturbations.…”

Section: Resultsmentioning

confidence: 97%

Controlled steering of Cherenkov surface plasmon wakes with a one-dimensional metamaterial

et al. 2015

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In the Cherenkov effect a charged particle moving with a velocity faster than the phase velocity of light in the medium radiates light that forms a cone with a half angle determined by the ratio of the two speeds. Here, we show that by creating a running wave of polarization along a one-dimensional metallic nanostructure consisting of subwavelength-spaced rotated apertures that propagates faster than the surface plasmon polariton phase velocity, we can generate surface plasmon wakes, a two-dimensional analogue of Cherenkov radiation. The running wave of polarization travels with a speed determined by the angle of incidence and the photon spin angular momentum of the incident radiation. By changing either one of these properties we demonstrate controlled steering of the Cherenkov surface plasmon wakes.

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Section: Resultsmentioning

confidence: 97%

Controlled steering of Cherenkov surface plasmon wakes with a one-dimensional metamaterial

et al. 2015

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“…This situation is illustrated in the panels on the right in Fig. 3a and 3b [84]. For the same rotation angle of 90 ∘ in the rectangular resonator element, it is seen that the accompanying phase changes for the cross polarized and surface plasmon beams are π and π/2 respectively ( Fig.…”

Section: Lossmentioning

confidence: 83%

“…cylindrical) where multiple surface plasmon modes can be superposed with a defined [84]: A similar application of the Berry phase principle for the manipulation and focusing of surface plasmon beams via rectangular nano-slits. However due to lack of helicity of the plasmons, the phase change that can be achieved with orientation changes is only π. Reprinted with permission from Refs [78] and [84]. Copyright 2015 Nature Publishing Group, 2015 Optical Society of America.…”

Section: Lossmentioning

confidence: 99%

Traditional and emerging materials for optical metasurfaces

et al. 2017

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Abstract:One of the most promising and vibrant research areas in nanotechnology has been the field of metasurfaces. These are two dimensional representations of metaatoms, or artificial interfaces designed to possess specialized electromagnetic properties which do not occur in nature, for specific applications. In this article, we present a brief review of metasurfaces from a materials perspective, and examine how the choice of different materials impact functionalities ranging from operating bandwidth to efficiencies. We place particular emphasis on emerging and non-traditional materials for metasurfaces such as high index dielectrics, topological insulators and digital metamaterials, and the potentially transformative role they could play in shaping further advances in the field. General Introduction to optical metasurfacesUnexpected and unusual effects have been recently reported in various fields of research, such as but not limited to acoustics, seismology, thermal physics, and electromagnetism. At the heart of these developments is a progres- sive understanding of the wave-matter interaction and our ability to artificially manipulate it, particularly at small length scales. This has in turn been largely driven by the discovery and engineering of materials at extreme limit. These "metamaterials" possess exotic properties that go beyond conventional or naturally occurring materials. Encompassing many new research directions, the field of metamaterials is rapidly expanding, and therefore, writing a complete review on this subject is a formidable task; here instead, we present a comprehensive review in which we discuss the progress and the emerging materials for metasurfaces, i.e. artificially designed ultrathin two dimensional optical metamaterials with customizable functionalities to produce designer outputs. Metasurfaces are often considered as the two dimensional versions of 3D metamaterials. The former, also known as frequency selective surfaces, or reflectand transmit-arrays in the microwave community [1-6], which has been recently shown to produce a variety of spectacular optical effects ranging from negative refraction [7], super/hyper-lensing [8][9][10], optical mirages to cloaking [11][12][13][14][15][16][17][18][19], are comprised of artificial materials engineered at the subwavelength scale to guide light along any arbitrary direction. The functionalities of individual optical components, which were previously essentially determined by the optical properties of materials, can now be specified at will. Effective material optical parameters can be rigorously derived via homogenization techniques by averaging the electromagnetic fields over a subwavelength volume encompassing each individual element of the periodic ensemble of resonant inclusions, with arbitrary geometry [12,[15][16][17][18][19]. Thus although metamaterials can be tailored for exotic optical functions, the basic mechanism responsible for shaping the optical wavefronts remains the same as that in conventional refractive optics: it is b...

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“…1(a) can be used for compensating inhomogeneous amplitude profile caused by the rotated angular variation. 13 The condition for homogeneous amplitude is obtained when nanoslits of left-and right-side envelope are perpendicular to each other and the distance between two envelopes is an odd integer multiple of / 2 SPP λ . The details for explaining homogeneous amplitude conditions can be found in our recent work.…”

Section: Principle Of Proposed Structurementioning

confidence: 99%

Polarization-sensitive plasmonic hot spot tuning with nanoslit arrays

Lee

Kim

et al. 2015

SPIE Proceedings

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Using the nanostructures supported by surface plasmon polaritons (SPPs) has been a great issue in optical sensing applications. Especially, a focused spot of SPPs, which is often called a near-field hot spot, has been numerously researched due to its high compactness beyond the diffraction limit and strong field enhancement applicable to nanoparticle sensing and tweezing. In this presentation, a novel design method for arbitrary tuning of the location of near-field hot spot controlled by the polarization of incident light is proposed. The array of nanoslit with spatially different tilted angle distribution is used for polarization-sensitive phase profile of excited SPPs.

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Plasmonic meta-slit: shaping and controlling near-field focus

Cited by 103 publications

References 33 publications

Controlled steering of Cherenkov surface plasmon wakes with a one-dimensional metamaterial

Controlled steering of Cherenkov surface plasmon wakes with a one-dimensional metamaterial

Traditional and emerging materials for optical metasurfaces

Polarization-sensitive plasmonic hot spot tuning with nanoslit arrays

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