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Opto-Electronics and Communications Conference (OECC)

Analogue of electromagnetically induced absorption in the microwave domain based on a reflective-type microring resonator

Rong Wang, Zhenzhou Tang, Menghao Huang, Shilong Pan

Published Jun 30, 2024• 0 citations
Publisher

Abstract

An analog of electromagnetically-induced-absorption (EIA) based on a reflective-type microring-resonator (RT-MRR) is proposed. When the amplitude and phase of the phase-modulated optical sidebands are influenced by RT-MRR, an EIA-liked response is obtained after photodetection. The EIA frequency range is 5-17.3 GHz, the depth range is 18 to 32 dB.

DOI
10.1109/oecc54135.2024.10975634

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An analog of electromagnetically-induced-absorption (EIA) based on a reflective-type microring-resonator (RT-MRR) is proposed. When the amplitude and phase of the phase-modulated optical sidebands are influenced by RT-MRR, an EIA-liked response is obtained after photodetection. The EIA frequency range is 5-17.3 GHz, the depth range is 18 to 32 dB.
Abstract Electromagnetically induced transparency/absorption (EIT/EIA) tailor the amplitude and phase response of an absorption resonance to create large dispersion, which has been exploited for applications in slow- and fast-light, and quantum information science. Since EIA enhances (induces) absorption of an already existing absorption (transmission) profile, it leads to a significant reduction in output signal power. Induction of a narrow absorption feature within a gain resonance can compensate for the signal loss while creating large dispersion at the EIA feature frequency. However, the demonstration of an analogue of EIA exploiting gain resonances has remained elusive. Here, we exploit coherent interaction between the Brillouin gain resonances in orthogonal polarization states to demonstrate controlled excitation of an analogue of EIA over microwave frequency range of 2.5–43 GHz. We induce a narrow absorption feature (~6 MHz), with controllable depth and frequency, within Brillouin gain resonance, demonstrating a novel technique for microwave photonic processing.
We theoretically investigate the classical analog of electromagnetically induced transparency (EIT) and electromagnetically induced absorption (EIA) in a planar metamaterial at optical frequency, which originates from destructive and constructive interference between dark and radiative elements.The metamaterial consists of two coupled resonators with different geometries.An EIT-like transparent window with low absorption is observed and found to be strongly affected by resonant states of the resonators.The transition between the EIT and EIA is achieved by changing the split width and coupling distance.The absorption is enhanced up to 2.5 times compared with the dipolar case.The excitation of the dark mode is very important for EIT-and EIA-like responses of the proposed metamaterial.The EIT and EIA phenomena offer a potential method for manipulating electromagnetic response in metamaterial-based devices.
The tunable multimode electromagnetically induced absorption (EIA)-like transmission was investigated in a two-ring system. In this system, by introducing asymmetry factor δi = λr - λr′, we provided several ways to modulate the EIA-like transmission spectra. An off-to-on EIA-like response could be realized by changing the radius or the refractive index of the rings. During the off-to-on process, we found the red shift and blue shift effects in the spectra are appeared and the widths of EIA-like dips are broadened. Numerical simulation by finite element method was conducted to verify our discussion. We believe all these would provide guidelines to design the useful EIA-like devices.
The nonreciprocal and polarization-sensitive performances of analog of electromagnetically induced absorption (EIA-like) and electromagnetically induced transparency (EIT-like) effects are investigated by the transfer matrix method (TMM), and the layered topology metastructure containing microwave magnetized plasma is used to construct suitable bright resonators, dark resonators, and quasi-dark resonators. In the case of low frequencies, the incident TM wave fosters an evident nonreciprocal EIA-like effect, and its nonreciprocal absorptivity is higher than 0.8, while the EIA-like phenomenon fails to occur in the case of the incident TE wave. For the case of high-frequency incidence, the EIT-like and EIA-like effects can be switched by converting the TM wave into the TE one under the case of backward propagation, and the maximum nonreciprocal absorptivity can exceed 0.9 if the TE wave propagates. The effects of some critical variables such as incident angle, plasma frequency, plasma cyclotron frequency, and plasma layer thickness on nonreciprocal and polarization-sensitive characteristics have been explored, and the slow light property of the EIT-like effect has also been briefly involved, and its group refractive index can reach 1224. The energy level transition theory and the optimized two-oscillator model are also analyzed to explain the generation of EIA-like and EIT-like phenomena in depth. We hope that the relevant phenomena will be interesting for slow light devices, two-way communication of electromagnetic waves, and polarization separation devices.
Classic analog of the electromagnetically induced transparency (EIT) in metamaterials has been demonstrated extensively by its attractive potential applications in light storage, slow light and sensing. However, the counterpart of EIT, electromagnetically induced absorption (EIA) has been studied rarely in coupled metamaterial systems. Here, we present the observation of the EIA effect in a vertically coupled three-resonator metamaterial. A well-defined absorption resonance is developed in the EIT window enabling a unique double-peak transparency, due to the magnetic resonance induced by the near-field coupling of the three resonators. The analog of EIA opens up a new route to advanced photonics devices.
We propose a novel compact structure with EIT-like spectrum by introducing two partial reflectors (silica holes) symmetrically placed within the microring resonator (MRR). The two Fabry-Pérot (FP) resonating cavities created by the silica holes, coupled with microring’s resonance modes, show EIT-like lineshapes spaced by free spectral range of MRR. The FWHM of EIT-like spectrum can be controlled by tuning the radii of the silica holes. Analytical results from the developed mathematical model and 3D FDTD simulations were found to be in good agreement with each other.