Propagation of Channel Plasmons at the Visible Regime in Aluminum V-Groove Waveguides

Lotan, Oren; Smith, C. L.; Bar-David, Jonathan; Mortensen, N. Asger; Levy, Uriel

doi:10.1021/acsphotonics.6b00648

Cited by 20 publications

(8 citation statements)

References 31 publications

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“…This comparison shows that a dominant mode in the out-coupling patterns is mode VI, which is Ex-symmetric, i.e., the mode that was excited by an S-polarized source. This is in agreement with previous studies, , showing that in V-groove waveguides, S-polarized sources couple into plasmonic modesmore efficiently than P-polarized sources. A detailed analysis of the out-coupling is provided in the Supporting Information.…”

supporting

confidence: 94%

Nanoscale Plasmonic V-Groove Waveguides for the Interrogation of Single Fluorescent Bacterial Cells

Lotan¹,

Bar-David²,

Smith

et al. 2017

Nano Lett.

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We experimentally demonstrate the interrogation of an individual Escherichia coli cell using a nanoscale plasmonic V-groove waveguide. Several different configurations were studied. The first involved the excitation of the cell in a liquid environment because it flows on top of the waveguide nanocoupler, while the obtained fluorescence is coupled into the waveguide and collected at the other nanocoupler. The other two configurations involved the positioning of the bacterium within the nanoscale waveguide and its excitation in a dry environment either directly from the top or through waveguide modes. This is achieved by taking advantage of the waveguide properties not only for light guiding but also as a mechanical tool for trapping the bacteria within the V-grooves. The obtained results are supported by a set of numerical simulations, shedding more light on the mechanism of excitation. This demonstration paves the way for the construction of an efficient bioplasmonic chip for diverse cell-based sensing applications.

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supporting

confidence: 94%

Nanoscale Plasmonic V-Groove Waveguides for the Interrogation of Single Fluorescent Bacterial Cells

Lotan¹,

Bar-David²,

Smith

et al. 2017

Nano Lett.

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“…Contrarily to elementary (planar) dielectric-metal interfaces, where the field is confined only along one direction, CPP modes render a two-dimensional (2D) confinement of the electromagnetic field in the plane normal to its propagation (the latter being along the translational invariant direction). As of today, a plethora of fundamental explorations [10][11][12] and proof-of-concept experiments have been carried out demonstrating the usage of noble metal CPPs in plasmonic interferometers [13,14], waveguides [15][16][17][18][19], ring-resonators [13], and for nanofocusing [20]. In the context of quantum plasmonics [21], CPPs have also been explored for the control of quantum emitters [22].…”

Section: Introductionmentioning

confidence: 99%

Universal description of channel plasmons in two-dimensional materials

Gonçalves¹,

Bozhevolnyi²,

Mortensen³

et al. 2017

Optica

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Channeling surface plasmon-polaritons to control their propagation direction is of the utmost importance for future optoelectronic devices. Here, we develop an effective-index method to describe and characterize the properties of 2D material's channel plasmon-polaritons (CPPs) guided along a V-shaped channel. Focusing on the case of graphene, we derive a universal Schrödinger-like equation from which one can determine the dispersion relation of graphene CPPs and corresponding field distributions at any given frequency, since they depend on the geometry of the structure alone. The results are then compared against more rigorous theories, having obtained a very good agreement. Our calculations show that CPPs in graphene and other 2D materials are attractive candidates to achieve deep subwavelength waveguiding of light, holding potential as active components for the next generation of tunable photonic devices. Author-generated version

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“…In addition to the noble metals, D. Y. Fedyanin et al [12], A.V. Krasavin et al [13], R. Zektzer et al [14], and O. Lotan et al [15] have shown that Cu, Si, and Al-based structures can also provide SPP guiding channels in the visible and infrared (IR) regime. To achieve such plasmonic effects, other semiconductors like GaAs can also be considered in which free carriers of negative or positive signs with appropriate effective masses can populate either the conduction band or the valence band, respectively, via appropriate doping.…”

Section: Introductionmentioning

confidence: 99%

A Theoretical Treatment of THz Resonances in Semiconductor GaAs p–n Junctions

2019

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Semiconductor heterostructures are suitable for the design and fabrication of terahertz (THz) plasmonic devices, due to their matching carrier densities. The classical dispersion relations in the current literature are derived for metal plasmonic materials, such as gold and silver, for which a homogeneous dielectric function is valid. Penetration of the electric fields into semiconductors induces locally varying charge densities and a spatially varying dielectric function is expected. While such an occurrence renders tunable THz plasmonics a possibility, it is crucial to understand the conditions under which propagating resonant conditions for the carriers occur, upon incidence of an electromagnetic radiation. In this manuscript, we derive a dispersion relation for a p–n heterojunction and apply the methodology to a GaAs p–n junction, a material of interest for optoelectronic devices. Considering symmetrically doped p- and n-type regions with equal width, the effect of certain parameters (such as doping and voltage bias) on the dispersion curve of the p–n heterojunction were investigated. Keeping in sight the different effective masses and mobilities of the carriers, we were able to obtain the conditions that yield identical dielectric functions for the p- and n-regions. Our results indicated that the p–n GaAs system can sustain propagating resonances and can be used as a layered plasmonic waveguide. The conditions under which this is feasible fall in the frequency region between the transverse optical phonon resonance of GaAs and the traditional cut-off frequency of the diode waveguide. In addition, our results indicated when the excitation was slightly above the phonon resonance frequency, the plasmon propagation attained low-loss characteristics. We also showed that the existence or nonexistence of the depletion zone between the p- and n- interfaces allowed certain plasmon modes to propagate, while others decayed rapidly, pointing out the possibility for a design of selective filters.

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Propagation of Channel Plasmons at the Visible Regime in Aluminum V-Groove Waveguides

Cited by 20 publications

References 31 publications

Nanoscale Plasmonic V-Groove Waveguides for the Interrogation of Single Fluorescent Bacterial Cells

Nanoscale Plasmonic V-Groove Waveguides for the Interrogation of Single Fluorescent Bacterial Cells

Universal description of channel plasmons in two-dimensional materials

A Theoretical Treatment of THz Resonances in Semiconductor GaAs p–n Junctions

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