Plasmonic-induced optical transparency in the near-infrared and visible range with double split nanoring cavity

Abstract

Plasmonic-induced optical transparency with double split nanoring cavity is investigated with finite difference time domain method. The coupling between the bright third-order mode of split nanoring with one gap and the dark quadrupole mode of split nanoring with two gaps leads to plasmonic analogue of electromagnetically induced transparency. The transparence window is easily modified to the near-infrared and visible range. Numerical results show a group index of 16 with transmission exceeding 0.76 is achieved for double split nanoring cavity. There is large cavity volume of double split nanoring, and the field enhancement inside the cavity is homogenous. Double split nanoring cavity could be a good platform for slow light and sensing applications.

Tailoring electromagnetically induced transparency for terahertz metamaterials: From diatomic to triatomic structural molecules

“…Such transparency comes from quantum destructive interference within a multi-level system and is linked to the existence of a dark state decoupled from the incident light. 1,2 In the last decade, there has been tremendous effort in establishing the optical analogies of the same phenomenon using optical waveguides, [3][4][5] photonic crystals, 6,7 and recently using metamaterials [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] that can free us from the usage of a pumping laser. These studies are largely motivated by the prospects of the slowlight effect associated with EIT.…”

Phonon interaction with coupled photonic-plasmonic modes in a phoxonic cavity

“…As a consequence, they have opened the way to numerous applications such as in biosensing, 25,26 surface enhanced Raman scattering, 27 photothermal therapy, 28 plasmo-mechanics 29 or plasmonic induced optical transparency. 30,31 Besides, the coupling of localized plasmons with the mechanical oscillations of nanoparticles of various shapes have been extensively investigated (see Ref. 32 for a list of references), in general by pump-probe experiments [33][34][35][36] or by Raman scattering.…”

A High Sensitivity Plasmonic Structure by Using Electric and Magnetic Plasmon Modes

“…Generally, Fano resonance arises from constructive or destructive interference of a narrow discrete resonance (dark mode) with a broad spectral line or continuum (bright mode) associated with a concentrated electromagnetic field [13]. Recently, Fano resonances excited in metallic nanostructures have attracted much interest because of their sharp spectral response and various potential applications in biochemical sensors [7-11, 14, 15], surface-enhanced Raman scattering (SERS) [16], plasmonic switch [17,18], electromagnetically induced transparency (EIT) [19][20][21][22][23], etc. It is convenient to excite Fano resonance in metallic nanostructures with symmetry breaking for the existence of higher-order resonances in such system [24][25][26], and therefore, it is easy to introduce bright modes coupling into dark modes, resulting in the excitation of subradiant modes and then forming Fano resonance.…”