PT-symmetry in optics

Zyablovsky, A. A.; Vinogradov, A. P.; Pukhov, A. A.; Dorofeenko, A. V.; Lisyansky, A. A.

doi:10.3367/ufnr.0184.201411b.1177

Cited by 31 publications

(26 citation statements)

References 59 publications

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“…[10]. The special spectral features play an important role for dielectric microcavities, see a review paper [11], and can in particular facilitate singlemode lasing [12,13] and find various other applications (see the recent review paper [14] and references therein).…”

Section: Introductionmentioning

confidence: 99%

Nonlinear switching and solitons in PT‐symmetric photonic systems

Suchkov

Sukhorukov

Huang

et al. 2016

Laser & Photonics Reviews

338

263

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One of the challenges of the modern photonics is to develop all-optical devices enabling increased speed and energy efficiency for transmitting and processing information on an optical chip. It is believed that the recently suggested ParityTime (PT) symmetric photonic systems with alternating regions of gain and loss can bring novel functionalities. In such systems, losses are as important as gain and, depending on the structural parameters, gain compensates losses. Generally, PT systems demonstrate nontrivial non-conservative wave interactions and phase transitions, which can be employed for signal filtering and switching, opening new prospects for active control of light. In this review, we discuss a broad range of problems involving nonlinear PT-symmetric photonic systems with an intensitydependent refractive index. Nonlinearity in such PT symmetric systems provides a basis for many effects such as the formation of localized modes, nonlinearly-induced PT-symmetry breaking, and all-optical switching. Nonlinear PT-symmetric systems can serve as powerful building blocks for the development of novel photonic devices targeting an active light control.

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Section: Introductionmentioning

confidence: 99%

Nonlinear switching and solitons in PT‐symmetric photonic systems

Suchkov

Sukhorukov

Huang

et al. 2016

Laser & Photonics Reviews

338

263

View full text Add to dashboard Cite

show abstract

“…Given the ubiquity of gain and loss processes in various electromagnetic structures and devices, such as lasers, absorbers and isolators, systematically studying their optical response via the scattering poles and zeros is highly desirable. In recent years, there has been a great interest in the so-called -symmetric structures, a particular class of non-Hermitian systems that exhibit balanced regions of gain and loss[52,[54][55][56][57][126][127][128][129][130][131][132].The concept of -symmetry originated in the context of theoretical quantum physics[133,134], after the pioneering work of Bender and Boettcher, showing that a large class of non-Hermitian Hamiltonians can exhibit entirely real spectra as long as they respectsymmetry. In general, a Hamiltonian is said to be -symmetric if it is invariant under simultaneous parity-( ) and time-( ) reversal operations [56,132-134].…”

mentioning

confidence: 99%

Anomalies in light scattering

et al. 2019

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Scattering of electromagnetic waves lies at the heart of most experimental techniques over nearly the entire electromagnetic spectrum, ranging from radio waves to optics and X-rays. Hence, deep insight into the basics of scattering theory and understanding the peculiar features of electromagnetic scattering is necessary for the correct interpretation of experimental data and an understanding of the underlying physics. Recently, a broad spectrum of exotic scattering phenomena attainable in suitably engineered structures has been predicted and demonstrated.Examples include bound states in the continuum, exceptional points in -symmetrical non-Hermitian systems, coherent perfect absorption, virtual perfect absorption, nontrivial lasing, nonradiating sources and cloaking, and others. In this paper, we establish a unified description of such exotic scattering phenomena and show that the origin of all these effects can be traced back to the properties of the underlying scattering matrix. two or three dimensions. Maxwell's equations describing spatial and temporal evolution of electric ( , ) t Er and magnetic ( , ) t Hr fields for an arbitrary system are

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“…]. Interestingly, despite symmetric systems are essentially non-Hermitian, they can exhibit features similar to Hermitian systems in specific ranges of the gain/loss parameter [87], [197]. For example, the Hamiltonian of a -symmetric structure can have real eigenvalues in the so-called exact -symmetric phase regime.…”

Section: Different Scenarios In Gain/loss Systemsmentioning

confidence: 99%

“…The symmetry concept dates back to the pioneering works of Bender and Boettcher in theoretical quantum physics [71], [383]. It has been shown that a large class of non-Hermitian Hamiltonians can exhibit entirely real spectra, as long as they respect -symmetry, i.e., symmetry in the inversion of time ( ) and space ( ) [71], [197], [383], [384]. Later the concept of -symmetry was extended to optical systems [70], [385], [386], where time-reversal (complex conjugation) involves mapping optical gain into loss.…”

Section: -Symmetry and Exceptional Pointsmentioning

confidence: 99%

Active Nanophotonics

Krasnok

Alù

2020

Proc. IEEE

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Recent progress in nanofabrication has led to tremendous technological developments in nanophotonics, which rely on the interaction of light with nanostructured matter. Nanophotonics has experienced a large surge of interest in recent years, from basic research to applied technology.The increased importance of extremely low-energy data processing at ultra-fast speeds has been encouraging the use of light for signal transport and processing. Energy demands and interaction time scales become smaller with the physical size of the nanostructures, hence nanophotonics opens the opportunity of integrating a large number of devices that can generate, control, modulate, sense and process light signals at ultrafast speeds and below femtojoule/bit energy levels.However, losses and diffraction pose fundamental challenges to the fundamental ability of nanophotonic structures to confine light efficiently in smaller and smaller volumes. In this framework, active nanophotonics, which combines the latest advances in nanotechnology with gain materials, has become in recent years a vital area of optics research, both from the physics, material science, and engineering standpoint. In this paper, we review recent efforts in enabling active nanodevices for lasing and optical sources, loss compensation, and to realize new optical functionalities, like -symmetry, exceptional points and nontrivial lasing based on suitably engineered distributions of gain and loss in nanostructures.

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PT-symmetry in optics

Cited by 31 publications

References 59 publications

Nonlinear switching and solitons in PT‐symmetric photonic systems

Nonlinear switching and solitons in PT‐symmetric photonic systems

Anomalies in light scattering

Active Nanophotonics

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