Tunable Optical Buffer through an Analogue to Electromagnetically Induced Transparency in Coupled Photonic Crystal Cavities

Hu, Chengchen; Schulz, Sebastian A.; Liles, Alexandros A.; O’Faoláin, Liam

doi:10.1021/acsphotonics.7b01590

Cited by 23 publications

(12 citation statements)

References 22 publications

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“…First, we note that the maximum delay measured in our experiments, τ g = 0.41 μs, has a bandwidth (FWHM) of 2 π × 0.17 MHz, which yields a delay-bandwidth product of 0.45. This is associated with an amplification rate of 4.4 dB µs −1 , a result in stark contrast with other integrated photonic devices, where delay is typically associated with losses in the dB ns −1 range 23 . Conversely, the maximum measured advance, − τ g = 0.50 μs, is associated with a loss of 5.1 dB and bandwidth of 2 π × 0.29 MHz.…”

Section: Discussionmentioning

confidence: 86%

Thermo-optically induced transparency on a photonic chip

et al. 2021

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Controlling the optical response of a medium through suitably tuned coherent electromagnetic fields is highly relevant in a number of potential applications, from all-optical modulators to optical storage devices. In particular, electromagnetically induced transparency (EIT) is an established phenomenon in which destructive quantum interference creates a transparency window over a narrow spectral range around an absorption line, which, in turn, allows to slow and ultimately stop light due to the anomalous refractive index dispersion. Here we report on the observation of a new form of both induced transparency and amplification of a weak probe beam in a strongly driven silicon photonic crystal resonator at room temperature. The effect is based on the oscillating temperature field induced in a nonlinear optical cavity, and it reproduces many of the key features of EIT while being independent of either atomic or mechanical resonances. Such thermo-optically induced transparency will allow a versatile implementation of EIT-analogs in an integrated photonic platform, at almost arbitrary wavelength of interest, room temperature and in a practical, low cost, and scalable system.

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Section: Discussionmentioning

confidence: 86%

Thermo-optically induced transparency on a photonic chip

et al. 2021

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“…Clearly, at the EIT peak, the group delay is 1100 ps larger than the background level. We use a figure of merit named delay‐bandwidth product (DBP) to compare with other slow light structures . DBP is defined here as the product of delay in time t and the bandwidth in frequency

Δ ω

.…”

Section: Turn Non‐deterministic Effects Into Controllable Degrees Of mentioning

confidence: 99%

Using Backscattering and Backcoupling in Silicon Ring Resonators as a New Degree of Design Freedom

Bogaerts

2019

Laser & Photonics Reviews

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Silicon optical ring resonators are potentially valuable for many applications. Due to the limited design freedom (coupling coefficient and roundtrip length), the functionality and performance cannot always be fully explored and optimized. In addition, high-contrast silicon ring resonators suffer from parasitic coupling between their clockwise and counterclockwise modes as well as parasitic coupling from the input to both circulating modes, which degrades or even distorts the response. Herein, an overview is given to harness these effects as additional design parameters to overcome the detrimental effects and realize novel functionalities in silicon ring resonators. Through simulations and experimental characterization, it is shown how the manipulation of backreflection and backcoupling enables various novel functions, including tunable Fano resonances with maximum slope rate over 700 dB nm−1 , tunable electromagnetically induced transparency, which slows light down over 1100 ps, a single-mode silicon ring resonator with a free spectral range over 150 nm and tuning efficiency over 11 times higher compared to that of conventional silicon ring resonators, fundamental suppression of inevitable backscattering, spectral tuning, single sideband filtering, and ultrahigh Q/large finesse resonances.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.

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“…As a special case of resonance resulted from dual modes interactions, electromagnetically induced transparency (EIT) takes place when the frequencies of strongly and weakly damped oscillators exactly match [58]. This effect has also shown great promise in developing novel devices, such as slow light photonic devices [59], on-chip buffers [60], sensitive sensors [61], and electromagnetically induced modulators [62]. More recently, few works have realized the EIT effect by transforming the BIC point into quasi-BIC state, thus indicating some intrinsic connections between the BIC and EIT phenomena [63][64][65].…”

Section: Introductionmentioning

confidence: 99%

Multiple Photonic Bound States in the Continuum in an Electromagnetically Induced Transparency Metasurface

Xie

Bai

et al. 2022

IEEE Photonics J.

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Bound state in the continuum (BIC), as a novel eigenmode with infinitely high-quality factor, has received great attention in modern optical science. Mode coupling in dielectric metasurfaces opens possibilities in searching for robust BICs. Here, we discover multiple BICs in periodic dielectric resonators composed of a silicon rectangular bar and a silicon ring in one lattice. For the symmetry-protected BIC at-Γ point, a sharp electromagnetically induced transparency window can be formed by either tilting incident angle to induce the 'bright-bright' mode coupling, or by displacing the ring to generate the 'bright-dark' mode coupling. Besides, the coupling between two resonators leads to a new energy band in the dielectric metasurface. As a result, two off-Γ BICs are formed owing to avoided crossings with two energy bands, and another one belongs to the single-resonance parametric BIC. Thus, our coupled resonators possess superior abilities to judiciously engineer BICs via versatile physical mechanisms. Taking advantage exclusively of coupled resonators in dielectric metasurfaces provides fresh insights into the creation of both symmetry-protected and accidental BICs, which enables profound advancements in designing novel photonic devices.

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Tunable Optical Buffer through an Analogue to Electromagnetically Induced Transparency in Coupled Photonic Crystal Cavities

Cited by 23 publications

References 22 publications

Thermo-optically induced transparency on a photonic chip

Thermo-optically induced transparency on a photonic chip

Using Backscattering and Backcoupling in Silicon Ring Resonators as a New Degree of Design Freedom

Multiple Photonic Bound States in the Continuum in an Electromagnetically Induced Transparency Metasurface

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