Field enhancement of epsilon-near-zero modes in realistic ultrathin absorbing films

Anopchenko, Aleksei; Gurung, Sudip; Bej, Subhajit; Lee, Ho Wai Howard

doi:10.1515/nanoph-2022-0816

Cited by 9 publications

(5 citation statements)

References 46 publications

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“…The peaks get narrower as the thickness increases because of decreasing losses, desirable for switching applications. Since the absorption is directly related to the intensity enhancement, shown in prior studies by Anopchenko and Gurung et al., [ 89,90 ] it would be possible to observe high field intensities inside the AZO film, with potential applications in nonlinear optics spanning time refraction, [ 75 ] and optical time‐reversal, [ 91 ] and high‐harmonic generation [ 92 ] using robust ENZ films.…”

Section: Tailoring Tin–azo Bilayer Stacks For Double‐resonant Ferrell...mentioning

confidence: 99%

Tailoring the Thickness‐Dependent Optical Properties of Conducting Nitrides and Oxides for Epsilon‐Near‐Zero‐Enhanced Photonic Applications

et al. 2022

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The unique properties of the emerging photonic materials, conducting nitrides and oxides, especially their tailorability, large damage thresholds, and, importantly, the so‐called epsilon‐near‐zero (ENZ) behavior, have enabled novel photonic phenomena spanning optical circuitry, tunable metasurfaces, and nonlinear optical devices. This work explores direct control of the optical properties of polycrystalline titanium nitride (TiN) and aluminum‐doped zinc oxide (AZO) by tailoring the film thickness, and their potential for ENZ‐enhanced photonic applications. This study demonstrates that TiN–AZO bilayers support Ferrell–Berreman modes using the thickness‐dependent ENZ resonances in the AZO films operating in the telecom wavelengths spanning from 1470 to 1750 nm. The bilayer stacks also act as strong light absorbers in the ultraviolet regime using the radiative ENZ modes and the Fabry–Perot modes in the constituent TiN films. The studied Berreman resonators exhibit optically induced reflectance modulation of 15% with picosecond response time. Together with the optical response tailorability of conducting oxides and nitrides, using the field enhancement near the tunable ENZ regime can enable a wide range of nonlinear optical phenomena, including all‐optical switching, time refraction, and high‐harmonic generation.

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Section: Tailoring Tin–azo Bilayer Stacks For Double‐resonant Ferrell...mentioning

confidence: 99%

Tailoring the Thickness‐Dependent Optical Properties of Conducting Nitrides and Oxides for Epsilon‐Near‐Zero‐Enhanced Photonic Applications

et al. 2022

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“…In this case, the wavelength expands, and the space and time fields are decoupled. Utilizing the unique behavior of the ENZ mode, many breakthroughs have been made in the fields of light absorption in subwavelength thin films [21][22][23], and communication devices [24], optical manipulation [25], enhanced nonlinear effect [26], electro-optical modulation [23], and extraordinary transmission through coupling [27]. In order to excite the ENZ mode, it is necessary to ensure that the selected material is sufficiently thin and that the permittivity is close to zero in a particular waveband [28].…”

Section: Introductionmentioning

confidence: 99%

Spectral splitting phenomenon caused by strong coupling of surface plasmon polariton mode and epsilon-near-zero mode

Yang,

Wang,

Kuang

et al. 2024

J. Phys. D: Appl. Phys.

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The strong coupling effect plays an important role in optimizing the optical properties of nano-photonics and improves the efficiency of manipulating light. However, coupling systems for nano-photonic devices usually have problems with complex structure, large size and low coupling strength. To address these issues, we design a nanograting structure to realize the strong coupling between the surface plasmon polariton mode and the epsilon-near-zero mode. The reflection spectra of the designed nanostructure show obvious Rabi splitting phenomenon. The Rabi splitting phenomenon is further verified by the theoretical result. In addition, the factors influencing the coupling effect strength in the nanostructure are analyzed. The proposed nanostructure can be used in nano-photonic devices such as sensors.

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“…Being inside the lightcone, these leaky modes can be excited using propagating waves. The strong field confinement upon excitation of these modes has lead to several interesting nonlinear optical applications, for example, second-harmonic generation [47,48]. In a recent paper, a symmetric structure with two polar dielectric films separated by an air gap supporting coupled Berreman modes was studied.…”

Section: Introductionmentioning

confidence: 99%

Enhanced beam shifts mediated by bound states in continuum

Biswas

Remesh

Achanta

et al. 2023

J. Opt.

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The interaction of light beams with resonant structures has led to the development of various optical platforms for sensing, particle manipulation, and strong light-matter interaction. In the current study, we investigate the manifestations of the bound states in continuum (BIC) on the in plane and out of plane shifts (referred to as Goos-Hanchen (GH) and Imbert-Fedorov (IF) shifts, respectively) of a finite beam with specific polarization incident at an arbitrary angle. Based on the angular spectrum decomposition, we develop a generic formalism for understanding the interaction of the finite beam with an arbitrary stratified medium with isotropic and homogeneous components. it is applied to the case of a Gaussian beam with p and circularly polarized light incident on a symmetric structure containing two polar dielectric layers separated by a spacer layer. For p-polarized plane wave incidence one of the coupled Berreman modes of the structure was recently shown to evolve to the bound state with infinite localization and diverging quality factor coexisting with the other mode with large radiation leakage (Remesh et al. Optics Communications, 498:127223, 2021). A small deviation from the ideal BIC resonance still offers resonances with very high quality factors and these are exploited in this study to report giant GH shifts. A notable enhancement in the IF shift for circularly polarized light is also shown. Moreover, the reflected beam is shown to undergo distortion leading to a satellite spot. The origin of such a splitting of the reflected beam is traced to a destructive interference due to the left and right halves of the corresponding spectra.

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Field enhancement of epsilon-near-zero modes in realistic ultrathin absorbing films

Cited by 9 publications

References 46 publications

Tailoring the Thickness‐Dependent Optical Properties of Conducting Nitrides and Oxides for Epsilon‐Near‐Zero‐Enhanced Photonic Applications

Tailoring the Thickness‐Dependent Optical Properties of Conducting Nitrides and Oxides for Epsilon‐Near‐Zero‐Enhanced Photonic Applications

Spectral splitting phenomenon caused by strong coupling of surface plasmon polariton mode and epsilon-near-zero mode

Enhanced beam shifts mediated by bound states in continuum

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