Mid-infrared nanospectroscopy of Berreman mode and epsilon-near-zero local field confinement in thin films

Shaykhutdinov, Timur; Furchner, Andreas; Rappich, Jörg; Hinrichs, Karsten

doi:10.1364/ome.7.003706

Cited by 30 publications

(41 citation statements)

References 22 publications

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“…Over the past decades, the existence of such thin-film polaritonic modes has attracted broad attention. [16][17][18][19][20][21][22][23][24][25][26] Initially, radiation in a narrow spectral window at the plasma frequency of thin metal films was predicted 16 and later observed. [18][19][20] Its origin was associated with a collective surface plasma mode with polarization normal to the surface plane of the film.…”

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confidence: 99%

Second Harmonic Generation from Phononic Epsilon-Near-Zero Berreman Modes in Ultrathin Polar Crystal Films

et al. 2019

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Immense optical field enhancement was predicted to occur for the Berreman mode in ultrathin films at frequencies in the vicinity of epsilon near zero (ENZ). Here, we report the first experimental proof of this prediction in the mid-infrared by probing the resonantly enhanced second harmonic generation (SHG) at the longitudinal optic phonon frequency from a deeply subwavelength-thin aluminum nitride (AlN) film. Employing a transfer matrix formalism, we show that the field enhancement is completely localized inside the AlN layer, revealing that the observed SHG signal of the Berreman mode is solely generated in the AlN film. Our results demonstrate that ENZ Berreman modes in intrinsically low-loss polar dielectric crystals constitute a promising platform for nonlinear nanophotonic applications. KeywordsBerreman mode, epsilon near zero, infrared, nanophotonics, second harmonic generation, field enhancementIn nanophotonics, nonlinear optical phenomena are driven by the enhancement of local optical fields, which arises due to polaritonic

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Second Harmonic Generation from Phononic Epsilon-Near-Zero Berreman Modes in Ultrathin Polar Crystal Films

et al. 2019

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“…In metals or doped semiconductors with a Drude‐like wavelength‐dependent dielectric function, ε 1 ≈ 0 conditions are met only around the crossover wavelength where ε 1 cancels (see Figure , for instance, in the case of Ag). Such ε 1 ≈ 0 conditions are found also at the vicinity of phonon absorption bands in the infrared . Some interband plasmonic or nanocomposite materials were called double ENZ materials, because their dielectric function displays two crossover wavelengths above the interband transitions (see Figure a in the case of Bi).…”

Section: Enz Resonancesmentioning

confidence: 97%

“…When the ε 1 of a nanofilm is close to 0, a strong optical absorption in a relatively narrow spectral region can be achieved as a result of the excitation of Berreman or ENZ modes . Berreman modes can be excited directly by the incident light propagating in the free space.…”

Section: Enz Resonancesmentioning

confidence: 99%

“…When the ε 1 of a nanofilm is close to 0, a strong optical absorption in a relatively narrow spectral region can be achieved as a result of the excitation of Berreman or ENZ modes. [57,58] Berreman modes can be excited directly by the incident light propagating in the free space. In contrast, the excitation of ENZ modes requires specific coupling strategies (e.g., prism or grating) in a similar manner as SPPs.…”

Section: Enz Resonancesmentioning

confidence: 99%

“…Such ε 1 % 0 conditions are found also at the vicinity of phonon absorption bands in the infrared. [58] Some interband plasmonic [36,59] or nanocomposite [40] materials were called double ENZ materials, because their dielectric function displays two crossover wavelengths above the interband transitions (see Figure 5a in the case of Bi). Therefore, controlling the spectral range where Berreman or ENZ optical absorption occurs requires tuning the wavelengthdependent dielectric function of the nanofilm to shift the crossover wavelengths.…”

Section: Enz Resonancesmentioning

confidence: 99%

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Toudert

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Functional materials with a tailored optical response are needed for applications including coloring, optical instrumentation, data encryption, thermal radiation shaping, energy harvesting, and environmental or biological sensing. A given application requires the material to absorb, transmit, reflect, or scatter light in a suitable way, in a specific, narrow, or broad spectral range selected in the visible or infrared. To achieve the optical response and functionality needed, it is appealing to design nanomaterials with a suitable composition and a properly engineered structure, and this should ideally be realized with high‐throughput and cost‐effective fabrication methods. Herein, the aim is to provide a view on some very recently reported functional nanomaterials showing an optical response tailored for applications by lithography‐free methods. It is illustrated how assembling tailor‐made nanostructures based on the expanding library of optical materials (and their specific wavelength‐dependent dielectric functions) enables harnessing a variety of optical resonances (plasmonic, epsilon near zero, high refractive index Mie, film interference) to tailor the nanomaterials' optical response. It is also shown that building the nanostructures from novel optical materials brings special functionalities, such as a switchable response. Examples of applications are put forward.

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Simultaneous Control of Spectral And Directional Emissivity with Gradient Epsilon‐Near‐Zero InAs Photonic Structures

2023

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Controlling both the spectral bandwidth and directionality of emitted thermal radiation is a fundamental challenge in contemporary photonics. Recent work has shown that materials with a spatial gradient in the frequency range of their epsilon‐near‐zero (ENZ) response can support broad spectrum directionality in their emissivity, enabling high total radiance to specific angles of incidence. However, this capability is limited spectrally and directionally by the availability of materials with phonon‐polariton resonances over long‐wave infrared wavelengths. Here, an approach is designed and experimentally demonstrated using doped III–V semiconductors that can simultaneously tailor spectral peak, bandwidth, and directionality of infrared emissivity. InAs‐based gradient ENZ photonic structures that exhibit broadband directional emission with varying spectral bandwidths and directional ranges as a function of their doping concentration profile and thickness are epitaxially grown and characterized. Due to its easy‐to‐fabricate geometry, it is believed that this approach provides a versatile photonic platform to dynamically control broadband spectral and directional emissivity for a range of emerging applications in heat transfer and infrared sensing.

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Mid-infrared nanospectroscopy of Berreman mode and epsilon-near-zero local field confinement in thin films

Cited by 30 publications

References 22 publications

Second Harmonic Generation from Phononic Epsilon-Near-Zero Berreman Modes in Ultrathin Polar Crystal Films

Second Harmonic Generation from Phononic Epsilon-Near-Zero Berreman Modes in Ultrathin Polar Crystal Films

Spectrally Tailored Light‐Matter Interaction in Lithography‐Free Functional Nanomaterials

Simultaneous Control of Spectral And Directional Emissivity with Gradient Epsilon‐Near‐Zero InAs Photonic Structures

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