Mapping the near-field propagation of surface plasmons on terahertz metasurfaces

Xu, Yuehong; Zhang, Xueqian; Tian, Zhen; Gu, Jianqiang; Ouyang, Chunmei; Li, Yanfeng; Han, Jiaguang; Zhang, Weili

doi:10.1063/1.4926967

Cited by 39 publications

(38 citation statements)

References 22 publications

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“…To map the electric-field intensity profiles on top of the sample, a near-field terahertz microscope system we recently developed was applied to scan the SP field41. The measured intensity profiles at 0.75 THz, as illustrated in Figs 1 and 2 agree well with numerical simulations.…”

Section: Resultssupporting

confidence: 62%

Plasmonic metalens based on coupled resonators for focusing of surface plasmons

Zhang

et al. 2016

Sci Rep

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As an essential functionality, flexible focusing of surface plasmons (SPs) is of particular interest in nonlinear optics and highly integrated plasmonic circuitry. Here, we developed a versatile plasmonic metalens, a metasurface comprised of coupled subwavelength resonators, whose optical responses exhibit a remarkable feature of electromagnetically induced transparency (EIT). We demonstrate numerically and experimentally how a proper spatial design of the unit elements steers SPs to arbitrary foci based on the holographic principles. More specifically, we show how to control the interaction between the constituent EIT resonators to efficiently manipulate the focusing intensity of SPs. We also demonstrated that the proposed metalens is capable of achieving frequency division multiplexing. The power and simplicity of the proposed design would offer promising opportunities for practical plasmonic devices.

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Section: Resultssupporting

confidence: 62%

Plasmonic metalens based on coupled resonators for focusing of surface plasmons

Zhang

et al. 2016

Sci Rep

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“…If the coupler is well-designed, destructive interferences will occur on one side of the columns, and constructive interference will occur on the other side simultaneously, which results in the unidirectional launching of the surface waves. 34,37 Here, by choosing w = 0.5 mm, l = 3 mm, p = 4 mm and g = λ 0 /4 = 4.1 mm, where λ 0 is the wavelength of the spoof SPPs at 9.75 GHz, in our simulations, we successfully excite soliton-like spoof SPPs over the HSPMs in a unidirectional (Figures 7b and c) or bi-directional manner (Figure 7d) at 9.75 GHz. This phenomenon is also demonstrated experimentally, and both unidirectional (Figures 7e and f) and bi-directional (Figure 7g) launching of the soliton-like spoof SPPs is observed.…”

Section: Resultsmentioning

confidence: 92%

Hyperbolic spoof plasmonic metasurfaces

et al. 2017

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Hyperbolic metasurfaces have recently emerged as a new research frontier because of the unprecedented capabilities to manipulate surface plasmon polaritons (SPPs) and many potential applications. However, thus far, the existence of hyperbolic metasurfaces has neither been observed nor predicted at low frequencies because noble metals cannot support SPPs at longer wavelengths. Here, we propose and experimentally demonstrate spoof plasmonic metasurfaces with a hyperbolic dispersion, where the spoof SPPs propagate on complementary H-shaped, perfectly conducting surfaces at low frequencies. Thus, non-divergent diffractions, negative refraction and dispersion-dependent spin-momentum locking are observed as the spoof SPPs travel over the hyperbolic spoof plasmonic metasurfaces (HSPMs). The HSPMs provide fundamental new platforms to explore the propagation and spin of spoof SPPs. They show great capabilities for designing advanced surface wave devices such as spatial multiplexers, focusing and imaging devices, planar hyperlenses, and dispersion-dependent directional couplers, at both microwave and terahertz frequencies.

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“…A predispersion compensation grating pair is employed to suppress the pulse stretching effect in the fiber. The probe is then fixed onto a 2D electrically controlled translation stage to enable the scanning function . The incident terahertz beam is collimated to a spot size of 5 mm diameter, which is large enough to cover the whole excitation range.…”

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confidence: 99%

Coupling‐Mediated Selective Spin‐to‐Plasmonic‐Orbital Angular Momentum Conversion

et al. 2019

Advanced Optical Materials

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their axis of propagation like a corkscrew, and possess a "doughnut" intensity profile. [3] In the past few decades, many demonstrations and applications of vortex beams have been reported, including optical data storage, [4,5] optical tweezers, [6] quantum cryptography, [7] communications, [8,9] etc. Particularly, geometric phase devices composed of basic elements with a spatially varying orientation could perform spin-to-orbital angular momentum conversion, [10][11][12][13][14] providing a direct connection between optical SAM and OAM. [15] Recently, plasmonic vortices generated through excitation of surface plasmons (SPs) with azimuthal-dependent phase profiles e ilθ at a metal-dielectric interface have attracted considerable attention [16][17][18][19][20][21][22] due to their strong OAM in the evanescent field region. In particular, Archimedean spirals [16][17][18]22] and well-arranged subwavelength resonators [19][20][21] have been employed to achieve spin-toplasmonic-orbital angular momentum conversion, providing useful insights into the nature of OAM and opening the door toward a number of exciting on-chip applications. [17,23] In most of these works, the incident LCP and RCP waves were transformed to plasmonic vortices of different topological charges, and the associated spin-dependent phenomena can be regarded as the photonic spin-Hall effect. [24][25][26] In direct analogy with the Orbital angular momentum (OAM) has been recently introduced to plasmonics for generating plasmonic vortices with a helical wavefront, opening avenues for exotic on-chip applications such as quantum information processing and communications. In previous demonstrations, carefully designed optical elements are used to convert left-and right-circular polarizations into plasmonic vortices with different topological charges, resulting in conversion from optical spin angular momentum (SAM) to plasmonic OAM. Here, it is demonstrated theoretically and experimentally that by utilizing the near-field coupling between paired resonators in a metasurface, selective conversion from optical SAM to plasmonic OAM is realized, where generation of plasmonic vortices can be achieved for incident light of one circular polarization while significantly suppressed for the other circular polarization. The proposed design scheme may motivate the design and fabrication of future practical plasmonic devices. PlasmonicsThe ORCID identification number(s) for the author(s) of this article can be found under https://doi.Light carries coordinate-independent spin angular momentum (SAM) [1] of ±ħ per photon, corresponding to left-and rightcircular polarizations (LCP and RCP), where ħ is the reduced Planck's constant. In the pioneering work by Allen et al., [2] it was shown that electromagnetic fields with a phase profile e ilθ could also carry orbital angular momentum (OAM), where l and θ are the topological charge and azimuth angle, respectively. Such beams, known as optical vortices, rotate around

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Mapping the near-field propagation of surface plasmons on terahertz metasurfaces

Cited by 39 publications

References 22 publications

Plasmonic metalens based on coupled resonators for focusing of surface plasmons

Plasmonic metalens based on coupled resonators for focusing of surface plasmons

Hyperbolic spoof plasmonic metasurfaces

Coupling‐Mediated Selective Spin‐to‐Plasmonic‐Orbital Angular Momentum Conversion

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