Directional Optical Travelling Wave Antenna Based on Surface Plasmon Transmission Line

Ding, Yinxing; Song, Xiaokang; Jiang, Ping; Jiao, Rongzhen; Wang, Lulu; Yu, Li; Zhang, Jiasen

doi:10.1002/lpor.201700073

Cited by 8 publications

(6 citation statements)

References 42 publications

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“…When γ equals to 17°, 47°, and 80°, the corresponding ∆ϕ is 29°, 43°, and 61°, respectively (Figure 7d). [112] A nearly linear relationship between ∆ϕ and γ is obtained. However, ∆ϕ is increased to ≈90° when γ is equal to 0°, which is larger than those of all bent Ag nanowires.…”

Section: Surface Plasmon Polariton-based Emissionmentioning

confidence: 87%

“…There have been many works reporting the directional SPP-based emissions from metallic nanowires. [107][108][109][110][111][112] A representative demonstration of directional emission is a single-crystalline Ag nanowire supported on a dielectric substrate. As shown in Figure 7a, the Ag nanowire is excited at the input end by a focused beam and the emitted light is collected in the Fourier plane of the microscope.…”

Section: Surface Plasmon Polariton-based Emissionmentioning

confidence: 99%

“…The intersection angle of a bent nanowire is defined as α, and its supplementary angle is named as γ (Figure 7c). [112] The left branch of the nanoantenna serves as a transmission line to guide the SPPs excited on the nanoantenna, and the energy of the SPPs is partially radiated into the far-field and partially propagating along the right branch. For a bent Ag nanowire with γ being 29°, the azimuthal angle ϕ and its half-power beam width ∆ϕ are 21° and 39°, respectively (Figure 7c).…”

Section: Surface Plasmon Polariton-based Emissionmentioning

confidence: 99%

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Directional Control of Light with Nanoantennas

Lai

Lam

et al. 2020

Advanced Optical Materials

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research fields, such as medicine, biology, and materials science. [1] These different types of optical components usually utilize the reflection, refraction, and diffraction of light to reshape the wavefronts and control the propagation direction of light in real space. [2] Although great achievements have been made in controlling light in various scopes, it is still challenging to manipulate the light direction at the subwavelength scale with the conventional optical devices. [3] The major constraint of controlling light at nanoscale is the diffraction limit of light, where the smallest resolvable feature is at the wavelength scale. The limited resolution hinders the observation of many intriguing phenomena and features at the subwavelength scale, such as biomolecules, cell components, nanoparticles and nanoscale devices. [4-7] New techniques are therefore highly demanded for subwavelength light manipulation. Nanoparticles have been introduced as a bridge to connect the gap between the macroscopic and the microscopic scale owing to their extraordinary optical properties in the manipulation of light. [8,9] In order to design nanoantennas with nanoparticles, many ideas have been borrowed from conventional macroscopic schemes. One of the most famous examples is Yagi-Uda antennas. This antenna structure was first invented by Hidetsugu Yagi and Shintaro Uda in 1926. [10] The traditional Yagi-Uda antennas are usually composed of multiple parallel elements in a line, usually halfwave dipoles made of metal rods, which function as a reflector, a driving element (feed), and several directors. Each director reradiates the electromagnetic waves from the driving element at a different phase, and the reradiated waves from the multiple directors superpose and interfere to enhance the radiation in a single direction. The Yagi-Uda antennas have been widely used in analog television, shortwave communication links, radar antennas, and broadcasting stations. Inspired by this idea, Yagi-Uda nanoantennas consisting of a reflector, a feed, and several directors have also been invented. As the nanoscale counterpart, Yagi-Uda nanoantennas can redirect light emission in a desired direction with a narrow angle and enhanced signal intensity in a nanoscale region. [11,12] The detailed analysis of different Yagi-Uda nanoantennas will be introduced in Sections 3-5. The inspiring work has opened a new era for directional light control at the subwavelength scale. After the development for a decade, the techniques for directional light scattering and emitting have been enriched. Many different Light manipulation has been widely employed in lighting, display, and energy storage, becoming an inseparable part of human lives. However, the conventional optical devices suffer from the diffraction limit of electromagnetic waves. To overcome the limitation, plasmonic and dielectric nanoantennas are introduced for the control of light direction at nanoscale. The directionality of the nanoantennas stems from their electromagnetic resonance properties or ...

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Section: Surface Plasmon Polariton-based Emissionmentioning

confidence: 87%

Section: Surface Plasmon Polariton-based Emissionmentioning

confidence: 99%

Section: Surface Plasmon Polariton-based Emissionmentioning

confidence: 99%

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Directional Control of Light with Nanoantennas

Lai

Lam

et al. 2020

Advanced Optical Materials

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“…Propagating SPPs are effectively scattered into radiating photons at the kink, resulting in a drop of the transmitted power. 16,32,33 By calculating the electric fields at the end facet of the 700 nm long c-Al NW, the resultant bending losses were determined to be 33%, 89%, and 96% for kink angles of a ¼ 35 , 55 , and 90 , respectively.…”

Section: Figmentioning

confidence: 99%

Nanoscale aluminum plasmonic waveguide with monolithically integrated germanium detector

Sistani

Bartmann

Güsken

et al. 2019

Applied Physics Letters

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Surface plasmon polaritons have rapidly established themselves as a promising concept for molecular sensing, near-field nanoimaging, and transmission lines for emerging integrated ultracompact photonic circuits. In this letter, we demonstrate a highly compact surface plasmon polariton detector based on an axial metal-semiconductor-metal nanowire heterostructure device. Here, an in-coupled surface plasmon polariton propagates along an aluminum nanowire waveguide joined to a high index germanium segment, which effectively acts as a photoconductor at low bias. Based on this system, we experimentally verify surface plasmon propagation along monocrystalline Al nanowires as thin as 40 nm in diameters. Furthermore, the monolithic integration of plasmon generation, guiding, and detection enables us to examine the bending losses of kinked waveguides. These systematic investigations of ultrathin monocrystalline Al nanowires represent a general platform for the evaluation of nanoscale metal based waveguides for transmission lines of next generation high-speed ultracompact on-chip photonic circuits.

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“…Unlike resonant antennas, TWAs use waves traveling on a guiding structure as the main radiation mechanism . V‐shaped Ag (V‐Ag) NWs supporting many conduction or localized modes have been proven to be TWAs with unique performances, including tunable radiation properties, easy fabrication and integration, and ultrawide bandwidths . In this paper, hybrid V‐Ag NWs (HVNWs) with QDs absorbed onto the V‐Ag NWs through SiO 2 spacers are proposed to realize unidirectional fluorescence emission.…”

Section: Introductionmentioning

confidence: 99%

Directional Modulation of Fluorescence by Nanowire‐Based Optical Traveling Wave Antennas

Wang

Duan

et al. 2019

Advanced Optical Materials

Self Cite

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Plasmonic optical antennas can direct light from quantum emitters and improve nanophotonics device efficiency. In this study, composite structures with V‐shaped Ag nanowires (V‐Ag NWs) and quantum dots (QDs) are designed and fabricated. V‐Ag NWs serving as optical traveling wave antennas (TWAs) are employed for QD fluorescence emission direction control. The modulated emission directionality is achieved up to 11.8 dB, and the azimuthal angle half‐power bandwidth is as narrow as 35°. The azimuthal radiation is effectively tuned from 0° to over 40° by changing the bending angles of the structures. Finite‐difference time‐domain and Green's function methods are used to analyze the far field radiation patterns that are in good agreement with the experiment measurements. TWAs are easy to fabricate and integrate with optical waveguide. Thus, they are excellent tools for realizing unidirectional fluorescence emission and are potentially applicable in integrated plasmonics and nanophotonics devices.

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Directional Optical Travelling Wave Antenna Based on Surface Plasmon Transmission Line

Cited by 8 publications

References 42 publications

Directional Control of Light with Nanoantennas

Directional Control of Light with Nanoantennas

Nanoscale aluminum plasmonic waveguide with monolithically integrated germanium detector

Directional Modulation of Fluorescence by Nanowire‐Based Optical Traveling Wave Antennas

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