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Latin America Optics and Photonics Conference

Multiple Fano resonance realization in far-field through plasmonic nanostructures using an optical gain medium

G. Lozano C., V.A.G. Rivera, O. B. Silva, F. A. Ferri, Euclydes Marega Jr.

Published Jan 1, 2022• 0 citations
Publisher

Abstract

Multiple Fano resonances were observed in plasmonic nanostructures on Er3+-doped tellurite glass. Our coupling function exhibits an asymmetric Fano line-shape form as a consequence of the interaction between the nanostructure and the Er3+: 2H11/2 state.
DOI
10.1364/laop.2022.tu4a.44

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Abstract It is crucial to control the tuning and improve the emission of a quantum emitter at the nanoscale. We report multiple Fano resonances in metallic nanostructures on an Er 3+ -doped tellurite glass. Periodic nanoslits were fabricated with a focused gallium ion beam on a gold thin film deposited on the tellurite glass. Is proposed a coupling function with Fano line-shape form, and the asymmetric parameter q for each resonance wavelength in the 515 to 535 nm region was calculated. This asymmetric resonance effect is a consequence of the quantum interaction between the continuum state, generated in the nanostructure, and the Stark splits of the 2^22 2 H 11/2_{11/2}11/2​ 11 / 2 state.
Optical Fano resonances are an increasingly important line-shape engineering tool with applications ranging from high-sensitivity sensing and ultrasmall lasers to low-power optical switching or modulating. Here we demonstrate a fully on-chip resonant nanostructure on a photonic crystal molecule platform exhibiting typical double- and Ramsey-Fano resonances, which can be actively controlled by the modification of the blockade transmittance in the waveguide. First, we investigate the transmission spectrum of a coupled double-cavity setting, showing a kind of double-Fano resonance line shape which consists of an asymmetric low-frequency Fano (LF) resonance and a high-frequency Fano (HF) resonance. At the same time, we elucidate the influences of various physical quantities on the generated LF and HF resonances. Second, and more interestingly, we reveal the occurrence of the Ramsey-Fano resonance profile by extending a double-cavity arrangement to a coupled-cavity-array arrangement. This Ramsey-Fano resonance can be attributed to the multiple quantum interference among a variety of light pathways. Finally, as an application, we discuss how to use an asymmetric double-Fano resonance line shape, which features the steep spectral slope, to improve the sensing performance. Our obtained results may stimulate future experimental efforts in controlling the double- and Ramsey-Fano resonance line shapes of this system more accurately.
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Plasmon-induced transparency, an effect analogous to electromagnetically induced transparency in atomic systems, is investigated theoretically in a plasmonic waveguide-coupled resonator device. Transmittance peak is induced through modulation of an external control beam, which alters the nonlinear optical response of a third-order Kerr medium incorporated within the structure. This induced transparency is utilized to achieve optical switching simultaneously at two wavelengths. At higher intensities, an induced peak exhibiting Fano resonant feature enables demonstration of simultaneous switching at three wavelengths. The performance of the switch is evaluated by determining the differential transmittance at the switching wavelengths.