Broken-diabolo nanoantenna for co-enhancing and -confining optical electric and magnetic field

Yu, Zehui; Gao, Z.; Wang, Zhuoyuan

doi:10.1016/j.optcom.2015.02.024

Cited by 5 publications

(3 citation statements)

References 17 publications

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“…Compared to the existing nanostructures, which can produce an electromagnetic hot spot, the BBA antenna has apparent advantages. For the broken diabolo nanoantenna, its field enhancement is much lower (1200 for the magnetic field and 1700 for the electric field). As to the broken-nanoring structure, the field enhancement is also much smaller (180 for magnetic field and 280 for electric field), the excitation source is not common, and the structure composition is relatively complex.…”

Section: Results and Discussionmentioning

confidence: 96%

“…Recently, a number of new types of plasmonic antennas are proposed to simultaneously enhance and confine electric and magnetic fields, which can greatly extend the applicability and flexibility of nanoantennas. − In nonlinear optics, an enhanced electric field is usually employed for the second-harmonic or third-harmonic generation. , Meanwhile, the local magnetic field associated with the magnetic-dipole resonance of the nanoantenna can also be utilized to generate the second-harmonic light . Thus, it is possible to apply the simultaneously enhanced electric and magnetic fields to nonlinear optics.…”

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confidence: 99%

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Bridged Bowtie Aperture Antenna for Producing an Electromagnetic Hot Spot

et al. 2017

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In this work we report a new type of nanostructure, the bridged bowtie aperture (BBA) antenna, for producing a simultaneously enhanced and confined electric and magnetic near field. The optical nanocircuit theory is employed to reveal its underlying mechanism. The electric near-field distribution of the nanostructure is observed using transmission-type s-SNOM at the nanoscale, and the magnetic near-field distribution is then derived from the electric near field of a complementary BBA structure using Babinet's principle. To our knowledge, the generation of such an electromagnetic hot spot has never been experimentally demonstrated. Relative to the existing nanostructures that can produce an electromagnetic hot spot, the BBA antenna has apparent advantages, which offers a new approach for nonlinear optics, surface-enhanced spectroscopy, biosensing, and metamaterials.

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Section: Results and Discussionmentioning

confidence: 96%

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confidence: 99%

Bridged Bowtie Aperture Antenna for Producing an Electromagnetic Hot Spot

et al. 2017

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“…Broadband nanoantennas play a potential role in the nanophotonic field. Recently, plasmonic optical nanoantennas [ 1 – 4 ] made by novel metal nanoparticles (MNPs) have generated great research interest due to their capability or dramatically localizing and enhancing electromagnetic (EM) fields on the surface of the MNPs [ 5 , 6 ] and have attracted much attention for near field applications in biosensing [ 7 ], spectroscopy [ 8 ], nanolithography [ 9 , 10 ], etc. Among these traditional optical nanoantennas, plasmonic bowtie nanoantennas (PBNAs) [ 11 , 12 ], which can efficiently convert light from free space into subwavelength scale with the local field enhancement at optical frequency in the small air gap between their two triangle MNPs.…”

Section: Introductionmentioning

confidence: 99%

Tunable Optical Performances on a Periodic Array of Plasmonic Bowtie Nanoantennas with Hollow Cavities

et al. 2016

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We propose a design method to tune the near-field intensities and absorption spectra of a periodic array of plasmonic bowtie nanoantennas (PBNAs) by introducing the hollow cavities inside the metal nanostructures. The numerical method is performed by finite element method that demonstrates the engineered hollow PBNAs can tune the optical spectrum in the range of 400–3000 nm. Simulation results show the hollow number is a key factor for enhancing the cavity plasmon resonance with respect to the hotspot region in PBNAs. The design efforts primarily concentrate on shifting the operation wavelength and enhancing the local fields by manipulating the filling dielectric medium, outline film thickness, and hollow number in PBNAs. Such characteristics indicate that the proposed hollow PBNAs can be a potential candidate for plasmonic enhancers and absorbers in multifunctional opto-electronic biosensors.

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