Propagation of electromagnetic waves in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>P</mml:mi><mml:mi>T</mml:mi></mml:mrow></mml:math>-symmetric hyperbolic structures

Shramkova, O.V.; Tsironis, G. P.

doi:10.1103/physrevb.94.035141

Cited by 25 publications

(12 citation statements)

References 49 publications

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“…PT -symmetric hypercrystals made of HMMs were studied in 59 , but the gain was introduced in the dielectric surrounding the HMM, and not directly into the HMM as proposed here.…”

Section: Resultsmentioning

confidence: 99%

Strong Coupling and Exceptional Points in Optically Pumped Active Hyperbolic Metamaterials

et al. 2018

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We investigate the interaction of light in gain-enhanced multilayered hyperbolic metamaterials in the strong interaction regime. Pumping the dye in the dielectric layers from inside the light cone, while emission occurs into the lower hyperbolic band outside the light cone, eases the problem of light incoupling. In the strong coupling regime both emission and absorption lines cause a distortion of the plasmonic modes due to Rabi splitting and a PT-symmetry broken phase, with generation of exceptional points at loss-gain compensation frequencies. We derive a semi-classical model that describes these phenomena for finite and infinite devices in detail, requiring only the overlap factor and the complex frequencies of the dye transition and the optical mode.

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“…PT -symmetric hypercrystals made of HMMs were studied in 59 , but the gain was introduced in the dielectric surrounding the HMM, and not directly into the HMM as proposed here.…”

Section: Resultsmentioning

confidence: 99%

Strong Coupling and Exceptional Points in Optically Pumped Active Hyperbolic Metamaterials

et al. 2018

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“…As a result, it is possible to use HMMs to achieve super‐Planckian thermal radiation and thermal transfer beyond the blackbody limit at nanoscale . Besides thermal engineering, another interesting topic about hyperbolic media is parity‐time (PT) symmetry . The parity and time operators are simultaneously applicable in a PT symmetric system, leading to non‐Hermitian systems with purely real spectra .…”

Section: Discussionmentioning

confidence: 99%

Hyperbolic Metamaterials and Metasurfaces: Fundamentals and Applications

Huo

Zhang

Liang

et al. 2019

Advanced Optical Materials

171

107

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and their potential applications in various fields, including optical waveguiding, imaging, ultrasensitive optical sensing, and electromagnetic cloaking.Among the different types of optical metamaterials proposed and demonstrated to date, there is one class of highly anisotropic metamaterials which exhibit hyperbolic (or indefinite) dispersions, depending on their effective electric tensors (here, we only consider nonmagnetic media with unit magnetic tensors). Such hyperbolic metamaterials (HMMs) have reached the ultra-anisotropic limit of traditional uniaxial crystal and lead to dramatic changes for the light propagation behaviors. [12][13][14][15][16] Compared with other optical metamaterials, like chiral [17,18] and split ring resonator-based metamaterials, [19,20] HMMs have advantages of relative ease of fabrication at optical frequencies, broadband nonresonant and 3D bulk responses, and flexible wavelength tunability. As a result, HMMs have attracted widespread interest and become a good multifunctional platform for many exotic applications, such as optical negative refraction and light beam steering, [12,[21][22][23][24][25][26][27][28] subdiffraction-limited imaging and nanolithography, [29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45] spontaneous and thermal emission engineering, [71][72][73][74][75][76][77][78][79][80] ultrasensitive optical, biological, and chemical sensing, [81][82][83][84][85][86][87][88][89] omnidirectional and broadband optical absorption. [90][91][92][93] On the other hand, ultrathin metasurfaces, which comprise a class of planar optical metamaterials with many subwavelength structural units, have attracted much attention due to their ability of locally controlling the phase, amplitude, and polarization of light at the interface between two natural materials. [94][95][96][97] 2D planar metasurfaces have many advantages over bulk metamaterials, including simplifying the fabrication and integration process, reducing energy loss, and being compatible with other photonics devices. In this context, as an efficient surface wave modulation platform, hyperbolic metasurfaces (HMSs) with in-plane hyperbolic dispersions have a potential influence on the development of on-chip planar photonic devices. [95,98] In this review, we first discuss the dispersions and realizations of hyperbolic media. Then, we review the recent achievements of various optical applications based on 3D bulk HMMs and 2D planar HMSs. It should be stressed that, although some application scenarios for 3D HMMs and 2D HMSs are analogous, in fact they are not equal to each other because additional constrains will be introduced on the surface wave as the dimensionality degraded, which is accompanied by fancy in-plane Recent advances in nanofabrication and characterization technologies have spurred many breakthroughs in the field of optical metamaterials and metasurfaces that provide novel ways of manipulating light interaction in a well controllable manner. Among these artificial nanostructured materials, ...

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“…However, to the best of our knowledge, there has been no thorough investigation of the homogenization of PT -symmetric systems. In the most relevant article [33], the PT -symmetric system is composed of the hyperbolic metamaterial and gain medium, the former being described using the Maxwell Garnett approach. Although the accurate transfer-matrix solution is available for multilayered systems, it is instructive to have a homogenized solution, too.…”

Section: Introductionmentioning

confidence: 99%

Nonlocal homogenization of PT -symmetric multilayered structures

2019

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Unique and highly tunable optical properties of PT -symmetric systems and metamaterials enable a plenty of entirely new linear and nonlinear optical phenomena with numerous applications, e.g., for designing subdiffraction lenses, nonreciprocal devices, etc. Therefore, the artificial media with the PT symmetry attract ever-increasing attention and are now a subject for intensive investigations. One of the commonly used methods providing information about the optical response of artificial nanostructural media is a so called effective medium theory. Here, we examine the possibility of utilizing the effective medium theory for a comprehensive analysis of PT -symmetric multilayered systems composed of alternating loss and gain slabs. We show that applicability of local effective material parameters (or Maxwell Garnett approximation) is very limited and cannot be exploited for a prediction of exceptional points marking a PT symmetry breaking. On the other hand, nonlocal bianisotropic effective medium parameters can be reliably used, if the thickness of a unit cell is much smaller than the radiation wavelength. In the case of obliquely incident plane waves, we reveal the limitation on the loss-gain coefficient, which should not be too large compared with the real part of the permittivity. We believe that our findings can improve the fundamental understanding of physics behind PT -symmetric systems and advance the development of auxiliary tools for analyzing their peculiar optical response.

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Propagation of electromagnetic waves inPT-symmetric hyperbolic structures

Cited by 25 publications

References 49 publications

Strong Coupling and Exceptional Points in Optically Pumped Active Hyperbolic Metamaterials

Strong Coupling and Exceptional Points in Optically Pumped Active Hyperbolic Metamaterials

Hyperbolic Metamaterials and Metasurfaces: Fundamentals and Applications

Nonlocal homogenization of PT -symmetric multilayered structures

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