Coherent perfect absorption at an exceptional point

Wang, Changqing; Sweeney, William R.; Stone, A. Douglas; Yang, Lan

doi:10.1126/science.abj1028

Cited by 196 publications

(106 citation statements)

References 70 publications

(39 reference statements)

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“…Even, programmable photonic circuits that can be reconfigured using a software have been demonstrated [253], which moves photonics along the similar path from ASIC (application-specific integrated circuits) to FPGA of electronics. From a basic science perspective, research on topological systems (see Chapter 8 in [9]), non-hermitian systems (see Chapter 7 in [9]), and devices based on exceptional point physics [146] provides many new phenomena and device concepts [254]. Thus, at the end of this 30-year-long journey, I belive that photonics made with complex silicon circuitry has yet to unveil new physics from which new understanding and new applications can emerge.…”

Section: Discussionmentioning

confidence: 99%

“…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%

“…Here, we discussed two devices enabled by coherently coupling MR, actually the related physics is much richer [163,164]. Other applications are possible such as synchronization of comb frequencies [165] or cavity quantum electrodynamics with trapped atoms [166] or perfect absorption [146].…”

Section: Side-coupled Integrated Sequences Of Optical Resonators Based Router and Switchesmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 99%

Section: Hermitian and Non-hermitian Physicsmentioning

confidence: 99%

Section: Side-coupled Integrated Sequences Of Optical Resonators Based Router and Switchesmentioning

confidence: 99%

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Thirty Years in Silicon Photonics: A Personal View

Pavesi

2021

Front. Phys.

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“…Such open or non-Hermitian systems generally have complex eigenvalues and may exhibit exceptional points [ 235 , 236 , 237 ]. Systems tuned to an exceptional point are extremely sensitive to perturbations [ 238 , 239 ]. In recent years, there has been tremendous progress in the theory and experimental implementations of non-Hermitian photonics, including all-lossy optical systems as well as parity-time symmetric systems [ 236 , 240 ].…”

Section: Metamaterials and Metasurfaces: Glimpses Of New Trendsmentioning

confidence: 99%

Metamaterials and Metasurfaces: A Review from the Perspectives of Materials, Mechanisms and Advanced Metadevices

2022

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Throughout human history, the control of light, electricity and heat has evolved to become the cornerstone of various innovations and developments in electrical and electromagnetic technologies. Wireless communications, laser and computer technologies have all been achieved by altering the way light and other energy forms act naturally and how to manage them in a controlled manner. At the nanoscale, to control light and heat, matured nanostructure fabrication techniques have been developed in the last two decades, and a wide range of groundbreaking processes have been achieved. Photonic crystals, nanolithography, plasmonics phenomena and nanoparticle manipulation are the main areas where these techniques have been applied successfully and led to an emergent material sciences branch known as metamaterials. Metamaterials and functional material development strategies are focused on the structures of the matter itself, which has led to unconventional and unique electromagnetic properties through the manipulation of light—and in a more general picture the electromagnetic waves—in widespread manner. Metamaterial’s nanostructures have precise shape, geometry, size, direction and arrangement. Such configurations are impacting the electromagnetic light waves to generate novel properties that are difficult or even impossible to obtain with natural materials. This review discusses these metamaterials and metasurfaces from the perspectives of materials, mechanisms and advanced metadevices in depth, with the aim to serve as a solid reference for future works in this exciting and rapidly emerging topic.

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“…However, a system with PT symmetry possesses purely real eigenspectra in certain regimes, whereas the eigenstates are non-orthogonal to each other. Over the past few years, PT-symmetric systems featuring balanced gain and loss profiles have been studied in optics 1 – 15 , optomechanics 16 , 17 , optoelectronics 18 and acoustics 19 – 21 and have initiated a number of exotic effects and applications including electromagnetically induced transparency 1 , 2 , coherent perfect absorption-lasing 3 – 6 , topological light steering 7 , single-mode lasing 8 – 10 , ultrasensitive sensors 11 – 13 , opto-electronic microwave generation 18 and non-reciprocal photon 14 , 15 and phonon 21 transmission.…”

Section: Mainmentioning

confidence: 99%

Fully integrated parity–time-symmetric electronics

et al. 2022

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Harnessing parity–time symmetry with balanced gain and loss profiles has created a variety of opportunities in electronics from wireless energy transfer to telemetry sensing and topological defect engineering. However, existing implementations often employ ad hoc approaches at low operating frequencies and are unable to accommodate large-scale integration. Here we report a fully integrated realization of parity–time symmetry in a standard complementary metal–oxide–semiconductor process technology. Our work demonstrates salient parity–time symmetry features such as phase transition as well as the ability to manipulate broadband microwave generation and propagation beyond the limitations encountered by existing schemes. The system shows 2.1 times the bandwidth and 30% noise reduction compared to conventional microwave generation in the oscillatory mode, and displays large non-reciprocal microwave transport from 2.75 to 3.10 GHz in the non-oscillatory mode due to enhanced nonlinearities. This approach could enrich integrated circuit design methodology beyond well-established performance limits and enable the use of scalable integrated circuit technology to study topological effects in high-dimensional non-Hermitian systems.

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Coherent perfect absorption at an exceptional point

Cited by 196 publications

References 70 publications

Thirty Years in Silicon Photonics: A Personal View

Thirty Years in Silicon Photonics: A Personal View

Metamaterials and Metasurfaces: A Review from the Perspectives of Materials, Mechanisms and Advanced Metadevices

Fully integrated parity–time-symmetric electronics

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