Current Optics and Photonics

Optical Society of Korea (한국광학회)
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Ultrahuge Light Intensity in the Gap Region of a Bowtie Nanoantenna Coupled to a Low-mode-volume Photonic-crystal Nanocavity

  • Ebadi, Nassibeh (Department of Electrical and Computer Engineering, University of Tabriz) ;
  • Yadipour, Reza (Department of Electrical and Computer Engineering, University of Tabriz) ;
  • Baghban, Hamed (School of Engineering-Emerging Technologies, University of Tabriz)
  • Received : 2016.12.05
  • Accepted : 2018.01.04
  • Published : 2018.02.25
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Abstract

This paper presents a new, efficient hybrid photonic-plasmonic structure. The proposed structure efficiently and with very high accuracy combines the resonant mode of a low-mode-volume photonic-crystal nanocavity with a bowtie nanoantenna's plasmonic resonance. The resulting enormous enhancement of light intensity of about $1.1{\times}10^7$ in the gap region of the bowtie nanoantenna, due to the effective optical-resonance combination, is realized by subtle optimization of the nanocavity's optical characteristics. This coupled structure holds great promise for many applications relying on strong confinement and enhancement of optical field in nanoscale volumes, including antennas (communication and information), optical trapping and manipulation, sensors, data storage, nonlinear optics, and lasers.

Keywords

KGHHD@_2018_v2n1_85_f0001.png 이미지

FIG. 1. (a) Three-dimensional view of the PC cavity (core area of PC nanocavity in dark gray, cladding in light gray), (b) band structure of the PC structure.

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FIG. 2. (a) The spectrum of the PC nanocavity, (b) corresponding x-component of the electric-field intensity at the resonant wavelength, (c) corresponding y-component of the electric-field intensity at the resonant wavelength.

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FIG. 3. (a) Three-dimensional schematic of the bowtie nanoantenna, (b) spectral response of the bowtie nanoantenna.

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FIG. 4. (a) Two-dimensional view of the analyzed hybrid structure, (b) wavelength spectrum of the hybrid structure, (c) calculated enhancement of the electric field intensity distribution |E|2 at the resonant wavelength, (d) calculated enhancement of the x-component of the electric-field intensity distribution |Ex|2 at the resonant wavelength, (e) calculated y-component of the electric-field intensity distribution |Ey|2 at the resonant wavelength.

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