Enhanced plasmonic nanofocusing of terahertz waves in tapered graphene multilayers

Liu, Weiwei; Wang, Bing; Ke, Shaolin; Qin, Chengzhi; Long, Hua; Wang, Kai; Lu, Peixiang

doi:10.1364/oe.24.014765

Cited by 19 publications

(3 citation statements)

References 53 publications

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“…This huge field enhancement is in particular important in the THz spectral regime as it can partly compensate the relatively low average power of THz sources and small cross-sections [293]. Nonlinear THz response [294][295][296][297][298][299] is a prime example utilizing intense THz field that boosts lightmatter interaction [300,301]. Furthermore, it is very clear that integration of the huge field enhancement in a gap with other novel optical/electrical/plasmonic properties of materials [302][303][304] or devices [9,[305][306][307][308][309][310][311][312][313] can expand the practical use of the THz field.…”

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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Section: Discussion and Outlookmentioning

confidence: 99%

Terahertz wave interaction with metallic nanostructures

2018

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“…Graphene, a two-dimensional (2D) material with a single layer of carbon atoms arranged in a honeycomb lattice, has attracted wide attention due to its exceptional optoelectronic properties [22][23][24][25][26][27][28][29][30][31][32][33][34]. The unique properties of this 2D material contain the ultrahigh carrier mobility [>1 × 10 5 cm 2 ∕V • s], extremely wide operating frequency range, versatile tunability by controlling the gate voltage or chemical doping, and compatibility with other photonic elements [23,24].…”

Section: Introductionmentioning

confidence: 99%

Graphene-supported manipulation of surface plasmon polaritons in metallic nanowaveguides

2017

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We investigate the electrically controlled light propagation in the metal-dielectric-metal plasmonic waveguide with a sandwiched graphene monolayer. The theoretical and simulation results show that the propagation loss exhibits an obvious peak when the permittivity of graphene approaches an epsilon-near-zero point when adjusting the gate voltage on graphene. The analog of electromagnetically induced transparency (EIT) can be generated by introducing side-coupled stubs into the waveguide. Based on the EIT-like effect, the hybrid plasmonic waveguide with a length of only 1.5 μm can work as a modulator with an extinction ratio of ∼15.8 dB, which is 2.3 times larger than the case without the stubs. The active modulation of surface plasmon polariton propagation can be further improved by tuning the carrier mobility of graphene. The graphene-supported plasmonic waveguide system could find applications for the nanoscale manipulation of light and chip-integrated modulation.

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“…One of the difficulties to explore the dynamical encircling is that two modes associated with EPs should decouple from the other in the system [25]. The number of SPP modes in multilayer graphene waveguide is equal to the number of graphene sheets [36], [37]. Therefore, the double-layer graphene waveguide exactly supports two SPP modes, which will benefit the observation of chiral behavior of dynamical encircling.…”

Section: Introductionmentioning

confidence: 99%