- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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Dielectric Microsphere Coupled to a Plasmonic Nanowire: A Self-Assembled Hybrid Optical Antenna
摘要： Hybrid mesoscale structures that can combine dielectric optical resonances with plasmon-polariton waves are of interest in chip-scale nano-optical communication and sensing. This experimental study shows how a fluorescent microsphere coupled to a silver nanowire can act as a remotely excited optical antenna. To realize this architecture, self-assembly methodology is used to couple a fluorescent silica microsphere to a single silver nanowire. By exciting propagating surface plasmon polaritons at one end of the nanowire, remote excitation of the Stokes-shifted whispering gallery modes (WGMs) of the microsphere is achieved. The WGM-mediated fluorescence emission from the system is studied using Fourier plane optical microscopy, and the polar and azimuthal emission angles of the antenna are quantified. Interestingly, the thickness of the silver nanowires is shown to have direct ramification on the angular emission pattern, thus providing a design parameter to tune antenna characteristics. Furthermore, by employing 3D numerical simulations, electric near-field of the gap junction between the microsphere and the nanowire is simulated and is transformed into far field. This work provides a self-assembled optical antenna that combines dielectric optical resonances with propagating plasmons and can be harnessed in hybrid nonlinear nanophotonics and single-molecule remote sensing.
关键词： optical antenna,whispering gallery modes,molecular fluorescence,directional emission,Fourier plane imaging
更新于2025-09-23 15:21:01
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Nanoplasmonics || Plasmonic Nanoantenna Array Design
摘要： Recently, wireless optical communication system is developing toward the chip level. Optical nanoantenna array in optical communication system is the key component for radiating and receiving light. In this chapter, we propose a sub-wavelength plasmonic nanoantenna with high gain operating at the standard optical communication wavelength of 1550 nm. The designed plasmonic antenna has a good matching with the silicon waveguide in a wide band, and light is fed from the bottom of the nanoantenna via the silicon waveguide. Furthermore, we design two kinds of antenna arrays with the proposed plasmonic nanoantenna, including one- and two-dimensional arrays (1 × 8 and 8 × 8). The radiation characteristics of the antenna arrays are investigated and both arrays have high gains and wide beam steering range without grating lobes.
关键词： localized surface plasmon,radiation characteristics,integrated photonic devices,plasmonic nanoantenna,integrated optical antenna arrays
更新于2025-09-23 15:21:01
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Effect of deposition angle on fabrication of plasmonic gold nanocones and nanodiscs
摘要： Metal nanocones can exhibit several strong plasmonic resonances, which are associated with intense and accessible electromagnetic hot spots. They can thus be used to enhance light–matter interactions or to facilitate location-specific sensing while enabling separation of some non-specific contributions towards the sensing signal. Nanocones and similar 3D structures are often fabricated with the use of the so-called self-shading effect, which occurs during the evaporation of a metal film into circular nanowells. Unfortunately, a full description of a successful deposition process with all the essential details is currently missing in literature. Here we present a detailed view of the fabrication of ordered arrays of conical gold nanostructures using electron beam lithography and gold electron beam evaporation. We show that the symmetry of the fabricated nanostructures is influenced by the lateral position of the substrate on the sample holder during the deposition. Off-axis deposition or tilt of the sample leads to asymmetric nanostructures. When the deposited film is thick enough, or the nanowells narrow enough, the entrance aperture is clogged, and nanocones with sharp tips are formed. In contrast, flat-top truncated cones are produced for thinner films or wider nanowells. All these findings help to identify inherent limits for the production of wafer-scale arrays of such non-planar nanostructures. On the other hand, they also suggest new fabrication possibilities for more complicated structures such as mutually connected nanocones for electrically addressable chips.
关键词： Plasmonics,Optical antenna,Nanodisc,Nanocone,Electron beam evaporation,Electron beam lithography
更新于2025-09-23 15:19:57
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[IEEE NAECON 2018 - IEEE National Aerospace and Electronics Conference - Dayton, OH (2018.7.23-2018.7.26)] NAECON 2018 - IEEE National Aerospace and Electronics Conference - Double-Pointed Optical Antenna in the Longwave Infrared (LWIR) Spectral Regime
摘要： Photonic antennas provide an effective approach for the light receiving with engineerable near fields and receiving gains. Various antennas such as dipole, bow-tie, circular disk, circular ring, and pointed-dipole antenna have been reported with an enhancement to infrared detection. In this paper, we report a new double-pointed optical antenna and its enhancement in the longwave infrared (LWIR, 8-12 μm or 25 tera-Hz to 37.5 tera-Hz) spectral regime. The double-pointed photonic antennas are simulated and compared with the single-pointed dipole antenna. It is found that the double-pointed photonic antennas show higher E-fields in the LWIR spectral regime for both the single antenna or coupled antenna configurations. The uncoupled double-pointed dipole antenna can be modeled as an RLC circuit, whereas the coupled double-pointed dipole antennas show clear Fano-type interference between the transmission and the discrete plasmonic resonant modes. The E-fields of the double-pointed antenna are also compared to those of the bow-tie antenna with the same gap dimension.
关键词： Fano-type interference,double-pointed dipole antenna,pointed dipole antenna,surface plasmon resonance,Optical antenna,longwave infrared enhancement
更新于2025-09-19 17:15:36
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Metamaterials, Anapoles and Flying Donuts
摘要： Heat-assisted magnetic recording (HAMR) allows for data writing in hard disks beyond 1 Tb/in2 areal density, by temporarily heating the area of a single bit to its Curie temperature. The metallic optical antenna or near-?eld transducer (NFT), used to apply the nanoscale heating to the media, may self-heat by several hundreds of degrees. With the NFT reaching such extreme temperatures, demonstrations of HAMR technology experience write-head lifetimes that are orders of magnitude less than that required for a commercial product. Hence, heating of the NFT is of upmost importance. In this paper, we ?rst derive fundamental limits on the temperature ratio NFT/Media to drive NFT design choices for low-temperature operation. Next, we employ inverse electromagnetic design software, which solves for unexpected geometries of the NFT and waveguide. We present computationally generated designs for the waveguide feeding the NFT that offer a 50% reduction in NFT self-heating (～220 °C) compared with typical industry designs.
关键词： HAMR,optimization,plasmonics,nanophotonics,near-?eld transducer (NFT),inverse problem,heat-assisted magnetic recording thermal,computational electromagnetics,hard disks,gradient methods,management,Adjoint method,optical antenna
更新于2025-09-19 17:13:59
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[IEEE ESSDERC 2019 - 49th European Solid-State Device Research Conference (ESSDERC) - Cracow, Poland (2019.9.23-2019.9.26)] ESSDERC 2019 - 49th European Solid-State Device Research Conference (ESSDERC) - Suspended Antenna-Coupled Nanothermocouple Array for Long-Wave Infrared Detection
摘要： Heat-assisted magnetic recording (HAMR) allows for data writing in hard disks beyond 1 Tb/in2 areal density, by temporarily heating the area of a single bit to its Curie temperature. The metallic optical antenna or near-field transducer (NFT), used to apply the nanoscale heating to the media, may self-heat by several hundreds of degrees. With the NFT reaching such extreme temperatures, demonstrations of HAMR technology experience write-head lifetimes that are orders of magnitude less than that required for a commercial product. Hence, heating of the NFT is of upmost importance. In this paper, we first derive fundamental limits on the temperature ratio NFT/Media to drive NFT design choices for low-temperature operation. Next, we employ inverse electromagnetic design software, which solves for unexpected geometries of the NFT and waveguide. We present computationally generated designs for the waveguide feeding the NFT that offer a 50% reduction in NFT self-heating (～220 °C) compared with typical industry designs.
关键词： optical antenna,Adjoint method,computational electromagnetics,heat-assisted magnetic recording,near-field transducer (NFT),management,thermal,nanophotonics,plasmonics,gradient methods,inverse problem,optimization,hard disks
更新于2025-09-19 17:13:59
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Controlled Fabrication of Optical Signal Input/Output Sites on Plasmonic Nanowires
摘要： Silver nanowires have attracted considerable attention as sub-diffraction limited diameter waveguides in a variety of applications including cell endoscopy and photonic integrated circuitry. Optical signal transport occurs by coupling light into propagating surface plasmons which scatter back into light further along the wire. However these inter-conversions only occur efficiently at wire ends, or at defects along the wire, which are not controlled during synthesis. Here we overcome this limitation, demonstrating the visible laser light-induced fabrication of gold nanostructures at desired positions on silver nanowires, and their utility as efficient in/out coupling points for light. The gold nanostructures grow via plasmon-induced reduction of Au(III) and are shown to be excellent ‘hotspots’ for surface-enhanced Raman scattering.
关键词： optical antenna,surface enhanced Raman scattering,Chemically synthesized noble metal nanowires,gold nanoparticle,laser direct writing
更新于2025-09-19 17:13:59
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[IEEE 2019 IEEE 16th International Conference on Group IV Photonics (GFP) - Singapore, Singapore (2019.8.28-2019.8.30)] 2019 IEEE 16th International Conference on Group IV Photonics (GFP) - Mid-Infrared Silicon Waveguide-Based Bolometer
摘要： We demonstrate the ?rst waveguide-based bolometers on Silicon-on-Insulator (SOI) platform for mid-infrared (MIR) wavelengths, which use plasmonic antennas as absorbing elements. The bolometer achieves a sensitivity of 0.80 % change in resistance per milliwatt of input power at the 3.8 μm wavelength.
关键词： bolometer,silicon photonics,mid-infrared,optical antenna
更新于2025-09-16 10:30:52
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[IEEE 2019 IEEE 16th International Conference on Group IV Photonics (GFP) - Singapore, Singapore (2019.8.28-2019.8.30)] 2019 IEEE 16th International Conference on Group IV Photonics (GFP) - Mid-Infrared Silicon Waveguide-Based Bolometer
摘要： We demonstrate the ?rst waveguide-based bolometers on Silicon-on-Insulator (SOI) platform for mid-infrared (MIR) wavelengths, which use plasmonic antennas as absorbing elements. The bolometer achieves a sensitivity of 0.80 % change in resistance per milliwatt of input power at the 3.8 μm wavelength.
关键词： mid-infrared,silicon photonics,bolometer,optical antenna
更新于2025-09-16 10:30:52
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Nano-plasmonic Bundt Optenna for broadband polarization-insensitive and enhanced infrared detection
摘要： Infrared detection devices are becoming miniature with micro or nano-scale size. The advantages of downsizing come on the expense of insufficient collection of infrared radiation. Therefore, utilizing nano-plasmonic optical antennas becomes mandatory. However, it is desirable to develop antennas with broad bandwidth, polarization insensitivity, wide field-of-view, and reasonable plasmonic losses in order to collect most of incident infrared radiation and enhance power absorption efficiency. Here, an innovative optical antenna (optenna) is proposed and demonstrated for the first time. It has a novel shape of Bundt baking-pan. The gold Bundt is arranged in a periodic array that can be placed on top of a thin-film infrared absorbing layer. The developed optenna can squeeze infrared electric and magnetic fields to 50 nm-wide area in order to enhance material absorption efficiency. It demonstrates polarization insensitivity and ultra-broad bandwidth with a large fractional-bandwidth within the near, shortwave, and midwave infrared bands. It shows a remarkable enhanced power absorption efficiency up to 8 orders of magnitude with a reasonable average power loss of ?3 dB and 80° field-of-view. It can be promising for future applications in solar-cells, telecommunication photodetectors, shortwave cameras, and midwave microbolometers.
关键词： optical antenna,infrared detection,polarization-insensitive,broadband,nano-plasmonic
更新于2025-09-11 14:15:04