Abstract
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.
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