Nanofocusing of terahertz wave in a tapered hyperbolic metal waveguide

Gao, Hua; Cao, Qing; Zhu, Minning; Teng, Da; Shen, Siyi

doi:10.1364/oe.22.032071

Cited by 10 publications

(7 citation statements)

References 47 publications

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“…In judiciously designed plasmonic antennas, local spots of particularly enhanced electric or magnetic field can be formed, referred to as hot spots. The hot spots typically arise from the interaction between adjacent parts of a plasmonic antenna separated by a small gap [2,3] but they can be also based on the lightning rod effect (a concentration of the field at sharp features of the antenna) [4][5][6] or combination of both. In various studies, electric hot spots have been reported over a broad spectral range from THz [5] (hot spot size λ/60000 predicted from electromagnetic simulations, * vlastimil.krapek@ceitec.vutbr.cz with λ denoting the wavelength of the incident wave) to visible [7] (hot spot size λ/600 and enhancement >500).…”

Section: Introductionmentioning

confidence: 99%

Plasmonic Antennas with Electric, Magnetic, and Electromagnetic Hot Spots Based on Babinet’s Principle

Hrtoň

Konečná²,

Horák

et al. 2020

Phys. Rev. Applied

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We theoretically study plasmonic antennas featuring areas of extremely concentrated electric or magnetic field, known as hot spots. We combine two types of electric-magnetic complementarity to increase the degree of freedom for the design of the antennas: bowtie and diabolo duality and Babinet's principle. We evaluate the figures of merit for different plasmon-enhanced optical spectroscopy methods and optical trapping: field enhancement, decay rate enhancement, quality factor of the plasmon resonances, and trapping potential depth. The role of Babinet's principle in interchanging electric and magnetic field hot spots and its consequences for practical antenna design are discussed. In particular, diabolo antennas exhibit slightly better performance than bowties in terms of larger field enhancement and larger Q factor. For specific resonance frequency, diabolo antennas are considerably smaller than bowties, which makes them favorable for the integration into more complex devices but also makes their fabrication more demanding in terms of spatial resolution. Finally, we propose a Babinet-type dimer antenna featuring electromagnetic hot spot with both the electric and magnetic field components treated on an equal footing.

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Section: Introductionmentioning

confidence: 99%

Plasmonic Antennas with Electric, Magnetic, and Electromagnetic Hot Spots Based on Babinet’s Principle

Hrtoň

Konečná²,

Horák

et al. 2020

Phys. Rev. Applied

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“…Also, localizations of incident/transmitted light before/after the gap can be incorporated to increase the field enhancement in the gap [322][323][324][325] (Figure 30). The other example is to make use of hybridization of a gap with plasmonic metastructures or metaelements [71,114,191,[320][321][322][323][324][325][326][327][328][329] that results in intensive localization of electric field in the form of surface waves such as vortexplasmon and spoof surface plasmon modes.…”

Section: Discussion and Outlookmentioning

confidence: 99%

Terahertz wave interaction with metallic nanostructures

2018

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Understanding light interaction with metallic structures provides opportunities of manipulation of light, and is at the core of various research areas including terahertz (THz) optics from which diverse applications are now emerging. For instance, THz waves take full advantage of the interaction to have strong field enhancement that compensates their relatively low photon energy. As the THz field enhancement have boosted THz nonlinear studies and relevant applications, further understanding of light interaction with metallic structures is essential for advanced manipulation of light that will bring about subsequent development of THz optics. In this review, we discuss THz wave interaction with deep sub-wavelength nano structures. With focusing on the THz field enhancement by nano structures, we review fundamentals of giant field enhancement that emerges from non-resonant and resonant interactions of THz waves with nano structures in both sub- and super- skin-depth thicknesses. From that, we introduce surprisingly simple description of the field enhancement valid over many orders of magnitudes of conductivity of metal as well as many orders of magnitudes of the metal thickness. We also discuss THz interaction with structures in angstrom scale, by reviewing plasmonic quantum effect and electron tunneling with consequent nonlinear behaviors. Finally, as applications of THz interaction with nano structures, we introduce new types of THz molecule sensors, exhibiting ultrasensitive and highly selective functionalities.

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“…Experimental realization of a coupling based on this idea was reported in a number of papers, see Ref. 42 and references therein.…”

Section: Discussionmentioning

confidence: 99%

“…The most nontrivial outcome of Eqs. (42), (43) and Fig. 10 is that, at frequency close to the surface plasmon frequency ω 0 / √ 2, the ratio of the transfer rates to left and to the right switches abruptly from 0 to 1 depending on the relation between the opening angles.…”

Section: Interaction Of Two Emitters At the Metal-air Surfacementioning

confidence: 95%

“…A natural unit of momentum (wave number) is q ∼ a −1 ; the meaning of q in the absence of translational symmetry will be clarified below. One advantage of the analytical approach over numerical methods applied to concrete sets of parameters 42 is that an analytical solution allows to establish general properties of the plasmon spectrum.…”

Section: Introductionmentioning

confidence: 99%

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Plasmon spectrum and plasmon-mediated energy transfer in a multiconnected geometry

Shan

Mishchenko²,

Raǐkh

2016

Phys. Rev. B

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Surface plasmon spectrum of a metallic hyperbola can be found analytically with the separation of variables in elliptic coordinates. The spectrum consists of two branches: symmetric, low-frequency branch, ω < ω0/ √ 2, and antisymmetric high-frequency branch, ω > ω0/ √ 2, where ω0 is the bulk plasmon frequency. The frequency width of the plasmon band increases with decreasing the angle between the asymptotes of the hyperbola. For the simplest multi-connected geometry of two hyperbolas separated by an air spacer the plasmon spectrum contains two low-frequency branches and two high-frequency branches. Most remarkably, the lower of two low-frequency branches exists at ω → 0, i.e., unlike a single hyperbola, it is "thresholdless." We study how the complex structure of the plasmon spectrum affects the energy transfer between two emitters located on the surface of the same hyperbola and on the surfaces of different hyperbolas.

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Nanofocusing of terahertz wave in a tapered hyperbolic metal waveguide

Cited by 10 publications

References 47 publications

Plasmonic Antennas with Electric, Magnetic, and Electromagnetic Hot Spots Based on Babinet’s Principle

Plasmonic Antennas with Electric, Magnetic, and Electromagnetic Hot Spots Based on Babinet’s Principle

Terahertz wave interaction with metallic nanostructures

Plasmon spectrum and plasmon-mediated energy transfer in a multiconnected geometry

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