Linear and nonlinear Fano resonance on two-dimensional magnetic metamaterials

Abstract

We demonstrate that both linear and nonlinear Fano resonances can be realized on two dimensional magnetic metamaterials. The Fano resonance comes from the interference between localized magnetic plasmon resonance and propagating surface plasmon polaritons. When studying the linear optical response of the metamaterial structure, this interference phenomenon was observed in the ellipsometric spectrum. By finely tailoring the geometrical parameters of the magnetic metamaterial device, the nonlinear Fano response was tuned to a nearinfrared wavelength (1.61-1.8 μm) of femtosecond pump laser, and Fano-type modulation of the third harmonic generation was found and agrees well with our theoretical model.

Coherent Fano resonances in a plasmonic nanocluster enhance optical four-wave mixing

“…Fanoresonant structures can exhibit very large local field enhancements (6, 7), making these structures prime candidates for nonlinear frequency generation. Although previous studies of nonlinear plasmonics used nanostructures with a single dipolar resonance (8, 9), in a multiinput process such as FWM, the conversion efficiency is expected to be further enhanced if the plasmon modes of the nanostructure are resonant with both input frequencies (10).In this study, we demonstrate highly efficient FWM from a plasmonic nanocluster that supports two distinct Fano resonances (FRs) (6,7,(11)(12)(13)(14). When excited by a coherent source, the two spatially coherent FRs oscillate collectively, in a mixed frequency analog to a two-state quantum system, where the electric fields from the two modes add coherently, resulting in strong field enhancements.…”

“…In this study, we demonstrate highly efficient FWM from a plasmonic nanocluster that supports two distinct Fano resonances (FRs) (6,7,(11)(12)(13)(14). When excited by a coherent source, the two spatially coherent FRs oscillate collectively, in a mixed frequency analog to a two-state quantum system, where the electric fields from the two modes add coherently, resulting in strong field enhancements.…”

Symmetry-Selective Third-Harmonic Generation from Plasmonic Metacrystals

“…The importance of macroscopic symmetry is especially prominent in plasmonic nanostructures, in which localized surface plasmon polariton excitations can be very sensitive to shape, size, and the surrounding medium [3]. The strong field localization in plasmonic nanostructures has been utilized to enhance the second harmonic generation (SHG) [4][5][6][7][8][9][10][11][12][13][14], third harmonic generation (THG) [15][16][17][18], and four-wave mixing [19][20][21]. In the past several years, much work has been dedicated to the investigation of SHG in plasmonic structures with broken centrosymmetry, such as split ring resonators [4], coaxial gaps [5], Land V-shaped nanorods [6,7], and G-type chiral metamolecules [8].…”

Sharp plasmonic resonance on gold gratings in amplitude and phase domains

“…5), the resonance of phase delay of reflected TM and TE waves becomes dramatically sharper as the incident angle increases from 50°to 75°. At 75°incidence, the TE wave has a slowly varying response in the surface plasmon resonance regime [20][21][22]; the maximum phase delay is at a wavelength of 702 nm and the minimum phase delay is at 711 nm. It is noted that some oscillations appeared in the measured phase and amplitude spectra; this is due to the multi-interference effect from the 7 μm thick SiO 2 buffer layer.…”

“…In fact, conventional ellipsometry is also a powerful tool for the measuring phase shift of reflected light with two cross polarizations. Several groups including us have been using commercial ellipsometers to study plasmon excitation in plasmonic/metamaterial nanostructures [20][21][22][23].…”