Volume 118, Number 6, June 2017
|Number of page(s)||5|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||04 September 2017|
Enhancement of multipolar Fano resonances by nanocrescent elliptical disk structures
1 Shaanxi Joint Lab of Graphene, State Key Lab Incubation Base of Photoelectric Technology and Functional Materials, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics & Photon-Technology, Northwest University - Xi'an 710069, China
2 Guangxi Key Laboratory of Automatic Detecting Technology and Instruments, Guilin University of Electronic Technology - Guilin 541004, China
Received: 18 May 2017
Accepted: 7 August 2017
Multipolar Fano resonance is important for sensing, nonlinear optics, and enhanced spectroscopy at short wavelength. A symmetry breaking nanocrescent elliptical disk (NCED) structure is employed to demonstrate enhanced multipolar Fano resonances. The local-electric-field enhancement (LFE) factor of hexapole and octupole modes in NCED reaches approximately 1000. This is due to the strong coupling of nanocrescent and the nanogap modes formed by a nanocrescent and elliptical disk. The multipolar resonance wavelengths can be tuned by the short axis of the ellipse and is sensitive to the surrounding refractive index in an ultraviolet and visible region. This work presents the promising applications of the multipolar Fano resonance in surface Raman spectroscopy, bio-chemistry sensing, and nonlinear optical response.
PACS: 42.25.Fx – Diffraction and scattering / 42.15.Eq – Optical system design / 52.25.Tx – Emission, absorption, and scattering of particles
© EPLA, 2017
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