Incoherent perfect absorption in lossy anisotropic materials

Debnath, Sanjay; Khan, Emroz; Narimanov, Evgenii E.

doi:10.1364/oe.27.009561

Cited by 5 publications

(5 citation statements)

References 21 publications

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“…Now CPA phenomena have been demonstrated in different materials, including graphene [21,22], high-contrast grating [23,24], waveguide [25], photonic crystals [26], plasmonic array [27], etc [28]. Meanwhile, for extensive applications in biosensing [29], molecular detection [30], photovoltaics [31], photodetection [32,33], optical communications [34] and quantum informations, etc, CPA has been studied in a very broad wave range from acoustics [35], to infrared [18,[36][37][38][39] and optical frequencies [40][41][42][43][44][45]. Recently, CPA of nonlinear matter waves has been realized experimentally in an atomic Bose-Einstein condensate system [46].…”

Section: Introductionmentioning

confidence: 99%

Broadband coherent perfect absorption by cavity coupled to three-level atoms in linear and nonlinear regimes

Wang

et al. 2021

New J. Phys.

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A broadband coherent perfect absorption (CPA) scheme consisting of an optical resonator coupled with three-level atoms excited by single cavity mode is proposed and analyzed. We show the output light field from the system is completely suppressed under specific conditions when the system is excited in linear and nonlinear regimes by two identical light fields from two ends of optical cavity. An analytical broadband CPA criterion for central and sideband excitations of cavity quantum electrodynamics (CQED) system is derived in linear regime. Moreover, we show the resonant excitation criterion for CPA is greatly extended in nonlinear regime. A new type of bistability behavior is found. The output field intensity and the bistability curve can be well tuned by dynamically adjusting system parameters. Our results demonstrate that the CPA is quite universal, and it should be useful in a variety of applications in optical logic and optical communication devices.

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Section: Introductionmentioning

confidence: 99%

Broadband coherent perfect absorption by cavity coupled to three-level atoms in linear and nonlinear regimes

Wang

et al. 2021

New J. Phys.

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“…where ε 0 is the permittivity of vacuum. The two wavevectors satisfy k − = −k + when q = 0 [16][17][18][19]. The value of k ± is determined by boundary conditions.…”

Section: A Theorymentioning

confidence: 99%

“…[13], we theoretically study two-dimensional uniform anisotropic media with a non-Hermitian dielectric tensor, and successfully derive the analytical solution of the NHSE in non-Hermitian anisotropic media. Although absorption of electromagnetic waves in lossy anisotropic materials was investigated [16][17][18][19], the NHSE in lossy (or gainy) anisotropic materials has not been pointed out to our knowledge.…”

Section: Introductionmentioning

confidence: 98%

Optical non-Hermitian skin effect in two-dimensional uniform media

Yoda¹,

Moritake²,

Takata³

et al. 2023

Preprint

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The non-Hermitian skin effect (NHSE) is a novel localization phenomenon in certain non-Hermitian systems with gain and/or loss. Most of previous works study the non-Hermitian skin effect in periodic systems. However, electromagnetic waves often propagate within uniform materials without periodic modulation, and it has not been clear whether the optical NHSE occurs in uniform media such as bulk materials and electromagnetic metamaterials. Here we establish the theory of the optical NHSE in non-Hermitian anisotropic media. We show that the NHSE occurs even in uniform media with appropriate anisotropy and material loss. The localization of non-Hermitian skin modes are completely determined by an effective gauge potential caused by the anisotropy of a dielectric tensor. On the basis of the theory, we propose subwavelength multilayer metamaterials as a novel platform for the optical NHSE. We also propose a new concept of stationarily-excited skin modes whose frequencies are forced to be real in non-Hermitian systems. We find that the NHSE occurs even under the condition that the frequency is forced to be real, which implies that the NHSE we propose is observable under stationary excitation. Our work presents a general theory of the NHSE in homogeneous systems, and pave the way to realize the optical NHSE in bulk materials and metamaterials.

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“…Most of the optical absorbers are based on the principles of plasmonic resonances, Fabry-Perot cavity resonances, lossy media, metamaterials, and meta-surfaces etc [1][2][3][4]. Absorbers based on surface plasmon resonance are polarization dependent, angle sensitive, and difficult to excite due to requirement of phase matching conditions [5].…”

Section: Introductionmentioning

confidence: 99%

Spatially selective narrow band and broadband absorption in Ag/SiO₂/Ag based trilayer thin films by oblique angle deposition of SiO₂ layer

Kar,

De,

Jena

et al. 2024

Nanotechnology

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We have experimentally demonstrated spatially selective absorption in Ag-SiO2-Ag based trilayer thin films by tuning the deposition angle of SiO2 layer. These structures generate cavity resonance which can be tuned across the substrate locations due to spatially selective thickness and refractive index of silicon oxide (SiO2) film sandwiched between metallic silver (Ag) mirrors. Spatially selective property of SiO2 film is obtained by oblique angle deposition (OAD) technique using an electron beam evaporation system. The resonance wavelength of absorption in this trilayer structure shifts across the substrate locations along the direction of oblique deposition. The extent of shift in resonance increases with increase in angle of deposition of SiO2 layer. 4.14 nm/mm average shift of resonance wavelength is observed when SiO2 is deposited at 400 whereas 4.84 nm/mm average shift is observed when SiO2 is deposited at 600. We observed that the width of resonance increases with angle of deposition of the cavity layer and ultimately the resonant absorption disappears and becomes broadband when SiO2 is deposited at glancing angle deposition (GLAD) configuration. Our study reveals that there is a suitable range of oblique angle of deposition from 400 to 600 for higher spatial tunability and resonant absorption whereas the absorption becomes broadband for glancing angle deposition.

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Incoherent perfect absorption in lossy anisotropic materials

Cited by 5 publications

References 21 publications

Broadband coherent perfect absorption by cavity coupled to three-level atoms in linear and nonlinear regimes

Broadband coherent perfect absorption by cavity coupled to three-level atoms in linear and nonlinear regimes

Optical non-Hermitian skin effect in two-dimensional uniform media

Spatially selective narrow band and broadband absorption in Ag/SiO₂/Ag based trilayer thin films by oblique angle deposition of SiO₂ layer

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Incoherent perfect absorption in lossy anisotropic materials

Cited by 5 publications

References 21 publications

Broadband coherent perfect absorption by cavity coupled to three-level atoms in linear and nonlinear regimes

Broadband coherent perfect absorption by cavity coupled to three-level atoms in linear and nonlinear regimes

Optical non-Hermitian skin effect in two-dimensional uniform media

Spatially selective narrow band and broadband absorption in Ag/SiO2/Ag based trilayer thin films by oblique angle deposition of SiO2 layer

Contact Info

Product

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Spatially selective narrow band and broadband absorption in Ag/SiO₂/Ag based trilayer thin films by oblique angle deposition of SiO₂ layer