Complete crossing of Fano resonances in an optical microcavity via nonlinear tuning

Bernard, Martino; Ramiro‐Manzano, Fernando; Pavesi, L.; Pucker, G.; Carusotto, Iacopo; Ghulinyan, Mher

doi:10.1364/prj.5.000168

Cited by 10 publications

(4 citation statements)

References 26 publications

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“…In our n NL > 0 case, the shift is towards lower frequencies. At sufficiently large powers, both curves display a sudden downward jump right after the resonance, as typical in optical bistability [38][39][40][41][42]. Note that the position of the jump depends on the direction: the larger internal intensity in the reverse configuration allows for a larger shift of the resonance before jumping.…”

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confidence: 99%

Nonlinearity-Induced Reciprocity Breaking in a Single Nonmagnetic Taiji Resonator

et al. 2021

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We report on the demonstration of an effective, nonlinearity-induced non-reciprocal behavior in a single non-magnetic multi-mode Taiji resonator. Non-reciprocity is achieved by a combination of an intensity-dependent refractive index and of a broken spatial reflection symmetry. Continuous wave power dependent transmission experiments show non-reciprocity and a direction-dependent optical bistability loop. These can be explained in terms of the unidirectional mode coupling that causes an asymmetric power enhancement in the resonator. The observations are quantitatively reproduced by a numerical finite-element theory and physically explained by an analytical coupled-mode theory. This nonlinear Taiji resonator has the potential of being the building block of large arrays where to study topological and/or non-Hermitian physics. This represents an important step towards the miniaturization of nonreciprocal elements for photonic integrated networks.

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confidence: 99%

Nonlinearity-Induced Reciprocity Breaking in a Single Nonmagnetic Taiji Resonator

et al. 2021

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“…Notably, the coupling between the narrow first-order mode and the broad second-order mode of the microdisk causes a characteristic Fano lineshape that is characterized by a sharp asymmetry in the response spectrum (Figure 10B, bottom panel). Tuning of the coupling and of the Fano lineshape asymmetry is possible by using nonlinear effects [142]. Clearly, these are only few observations of the phenomena associated to non-Hermitian photonic systems, more studies have been reported in the literature, see e.g., [143][144][145][146].…”

Section: Hermitian and Non-hermitian Physicsmentioning

confidence: 99%

Thirty Years in Silicon Photonics: A Personal View

Pavesi

2021

Front. Phys.

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Silicon Photonics, the technology where optical devices are fabricated by the mainstream microelectronic processing technology, was proposed almost 30 years ago. I joined this research field at its start. Initially, I concentrated on the main issue of the lack of a silicon laser. Room temperature visible emission from porous silicon first, and from silicon nanocrystals then, showed that optical gain is possible in low-dimensional silicon, but it is severely counterbalanced by nonlinear losses due to free carriers. Then, most of my research focus was on systems where photons show novel features such as Zener tunneling or Anderson localization. Here, the game was to engineer suitable dielectric environments (e.g., one-dimensional photonic crystals or waveguide-based microring resonators) to control photon propagation. Applications of low-dimensional silicon raised up in sensing (e.g., gas-sensing or bio-sensing) and photovoltaics. Interestingly, microring resonators emerged as the fundamental device for integrated photonic circuit since they allow studying the hermitian and non-hermitian physics of light propagation as well as demonstrating on-chip heavily integrated optical networks for reconfigurable switching applications or neural networks for optical signal processing. Finally, I witnessed the emergence of quantum photonic devices, where linear and nonlinear optical effects generate quantum states of light. Here, quantum random number generators or heralded single-photon sources are enabled by silicon photonics. All these developments are discussed in this review by following my own research path.

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“…Moreover, it can be observed from the spectra that the sharp edge "switches" when the ridge width w r is varied from the smallest to the largest values. Such phenomenon can be explained by using the Fano formula, [35][36][37] as summarized in Section S5 in the Supporting Information. Figure 5d shows the measured transmittance spectrum for the optimized metagrating with w r ≈ 1.14 µm.…”

Section: Fabrication and Characterizationmentioning

confidence: 99%

Silicon‐Waveguide‐Integrated High‐Quality Metagrating Supporting Bound State in the Continuum

Shi

2020

Laser & Photonics Reviews

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The photonic bound state in the continuum (BIC) is a spatially bounded eigen state that can be realized in the form of a supercavity mode with an ultrahigh quality factor. The high‐quality supercavity resonance can be supported by photonic crystal slabs, asymmetric metasurfaces, and high‐contrast gratings. However, these schemes all suffer from bulky device size and complex experimental setup. Herein, a silicon‐waveguide‐integrated high‐quality metagrating is proposed and demonstrated as a new platform to manipulate the supercavity mode. The shallow‐ridge metagrating is directly embedded in the silicon slab waveguide, so the input slab mode can be coupled into the resonant ridge mode, which can be further transformed into the supercavity mode by utilizing the intra‐waveguide Fabry–Perot interference. Such an effect has been experimentally verified by the fabricated devices. The metagrating operating near the supercavity regime is also experimentally realized with a high quality factor ≈5200. As an application, such high‐quality metagrating is exploited to realize the temperature sensing with a high temperature sensitivity ≈77 pm K−1. The proposed integrated metagrating provides a novel approach to harness the BIC, paving ways for a new class of BIC‐based nanophotonic devices with high performance, chip‐scale footprint, and long‐term stability.

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Complete crossing of Fano resonances in an optical microcavity via nonlinear tuning

Cited by 10 publications

References 26 publications

Nonlinearity-Induced Reciprocity Breaking in a Single Nonmagnetic Taiji Resonator

Nonlinearity-Induced Reciprocity Breaking in a Single Nonmagnetic Taiji Resonator

Thirty Years in Silicon Photonics: A Personal View

Silicon‐Waveguide‐Integrated High‐Quality Metagrating Supporting Bound State in the Continuum

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