Passive PT Symmetry in Organic Composite Films via Complex Refractive Index Modulation

Yan, Yixin; Giebink, Noel C.

doi:10.1002/adom.201400021

Cited by 26 publications

(14 citation statements)

References 24 publications

(32 reference statements)

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“…Interestingly, because the system is not conservative in this case, the reflection values can greatly exceed unity [77]. Unidirectional invisibility was recently observed in various platforms including photonic mesh lattices (see Figure 2B) [78,79], passive silicon periodic nanowires [80], multilayer Si/SiO 2 structures [81], organic films [82], and electroacoustic resonators [17].…”

Section: Pt-symmetric Metamaterials and Non-hermitian Cloakingmentioning

confidence: 88%

Non-Hermitian and topological photonics: optics at an exceptional point

et al. 2020

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In the past few years, concepts from non-Hermitian (NH) physics, originally developed within the context of quantum field theories, have been successfully deployed over a wide range of physical settings where wave dynamics are known to play a key role. In optics, a special class of NH Hamiltonians – which respects parity-time symmetry – has been intensely pursued along several fronts. What makes this family of systems so intriguing is the prospect of phase transitions and NH singularities that can in turn lead to a plethora of counterintuitive phenomena. Quite recently, these ideas have permeated several other fields of science and technology in a quest to achieve new behaviors and functionalities in nonconservative environments that would have otherwise been impossible in standard Hermitian arrangements. Here, we provide an overview of recent advancements in these emerging fields, with emphasis on photonic NH platforms, exceptional point dynamics, and the very promising interplay between non-Hermiticity and topological physics.

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Section: Pt-symmetric Metamaterials and Non-hermitian Cloakingmentioning

confidence: 88%

Non-Hermitian and topological photonics: optics at an exceptional point

et al. 2020

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“…There, the asymmetry in the light reflection at EPs is induced by the destructive interference of the coalescing light modes. The unidirectionality and the related phenomena have also been observed in photonic lattices [161], organic composite films [162], acoustic sensors [163], micro resonators with definite angular momentum modes [164] and chiral rotating modes [165][166][167]. Another example is a scattering in a single cavity fabricated by semiconductor structures with gain and loss [168].…”

Section: Physical Applicationsmentioning

confidence: 98%

Non-Hermitian Physics

Ashida,

Gong,

Ueda

2020

Preprint

129

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A review is given on the foundations and applications of non-Hermitian classical and quantum physics. First, key theorems and central concepts in non-Hermitian linear algebra, including Jordan normal form, biorthogonality, exceptional points, pseudo-Hermiticity and parity-time symmetry, are delineated in a pedagogical and mathematically coherent manner. Building on these, we provide an overview of how diverse classical systems, ranging from photonics, mechanics, electrical circuits, acoustics to active matter, can be used to simulate non-Hermitian wave physics. In particular, we discuss rich and unique phenomena found therein, such as unidirectional invisibility, enhanced sensitivity, topological energy transfer, coherent perfect absorption, single-mode lasing, and robust biological transport. We then explain in detail how non-Hermitian operators emerge as an effective description of open quantum systems on the basis of the Feshbach projection approach and the quantum trajectory approach. We discuss their applications to physical systems relevant to a variety of fields, including atomic, molecular and optical physics, mesoscopic physics, and nuclear physics with emphasis on prominent phenomena/subjects in quantum regimes, such as quantum resonances, superradiance, continuous quantum Zeno effect, quantum critical phenomena, Dirac spectra in quantum chromodynamics, and nonunitary conformal field theories. Finally, we introduce the notion of band topology in complex spectra of non-Hermitian systems and present their classifications by providing the proof, firstly given by this review in a complete manner, as well as a number of instructive examples. Other topics related to non-Hermitian physics, including nonreciprocal transport, speed limits, nonunitary quantum walk, are also reviewed.

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“…This is similar to the transmission in the structure of Figure 2B, which is the same in both directions regardless of the presence of gain or loss ( Figure 2B). In addition, Yan and Giebink exploited vapor-deposited organic small molecules as a platform to realize passive PT-symmetry breaking and demonstrated unidirectional reflectionlessness at EPs in a composite organic thin film via complex refractive index modulation [77]. Zhu et al designed a passive PT-symmetric grating with asymmetric diffraction arising from the spontaneous PT-symmetry breaking at EPs in a wide range of incidence angles [78].…”

Section: Unidirectional Reflectionless Propagation In Pt-symmetric Symentioning

confidence: 99%

Unidirectional reflectionless light propagation at exceptional points

et al. 2017

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Abstract:In this paper, we provide a comprehensive review of unidirectional reflectionless light propagation in photonic devices at exceptional points (EPs). EPs, which are branch point singularities of the spectrum, associated with the coalescence of both eigenvalues and corresponding eigenstates, lead to interesting phenomena, such as level repulsion and crossing, bifurcation, chaos, and phase transitions in open quantum systems described by non-Hermitian Hamiltonians. Recently, it was shown that judiciously designed photonic synthetic matters could mimic the complex non-Hermitian Hamiltonians in quantum mechanics and realize unidirectional reflection at optical EPs. Unidirectional reflectionlessness is of great interest for optical invisibility. Achieving unidirectional reflectionless light propagation could also be potentially important for developing optical devices, such as optical network analyzers. Here, we discuss unidirectional reflectionlessness at EPs in both parity-time (PT)-symmetric and non-PT-symmetric optical systems. We also provide an outlook on possible future directions in this field.

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Passive PT Symmetry in Organic Composite Films via Complex Refractive Index Modulation

Cited by 26 publications

References 24 publications

Non-Hermitian and topological photonics: optics at an exceptional point

Non-Hermitian and topological photonics: optics at an exceptional point

Non-Hermitian Physics

Unidirectional reflectionless light propagation at exceptional points

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