Feature issue introduction: Beyond Thin Films: Photonics with Ultrathin and Atomically Thin Materials

Foteinopoulou, Stavroula; Panoiu, Nicolae C.; Shalaev, Vladimir M.; Subramania, Ganapathi Subramanian

doi:10.1364/ome.9.002427

Cited by 3 publications

(2 citation statements)

References 87 publications

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“…These include optical coatings, color filters, − infrared absorbers, transparent conductors − for displays or solar cells, meta-materials, − meta-surfaces, , and plasmonics, − to name a few. An ongoing trend in photonics is the transition from thin to ultrathin films and atomically thin materials . In this paper, special attention has also been given to ultrathin metal films (UTMFs), as these show strong potential for use in optoelectronic devices due to their high conductivity and transparency, and also their tunable properties. − …”

Section: Introductionmentioning

confidence: 99%

“…An ongoing trend in photonics is the transition from thin to ultrathin films and atomically thin materials. 23 In this paper, special attention has also been given to ultrathin metal films (UTMFs), as these show strong potential for use in optoelectronic devices due to their high conductivity 7 and transparency, 9 and also their tunable properties. 24−26 The optical response of thin films depends on their thickness, morphology, and complex refractive index (RI).…”

Section: ■ Introductionmentioning

confidence: 99%

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Multispectral Holographic Intensity and Phase Imaging of Semitransparent Ultrathin Films

Haegele,

Martínez-Cercós,

Arrés Chillón

et al. 2024

ACS Photonics

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In this paper, we demonstrate a novel optical characterization method for ultrathin semitransparent and absorbing materials through multispectral intensity and phase imaging. The method is based on a lateral-shearing interferometric microscopy (LIM) technique, where phase-shifting allows extraction of both the intensity and the phase of transmitted optical fields. To demonstrate the performance in characterizing semitransparent thin films, we fabricated and measured cupric oxide (CuO) seeded gold ultrathin metal films (UTMFs) with mass-equivalent thicknesses from 2 to 27 nm on fused silica substrates. The optical properties were modeled using multilayer thin film interference and a parametric model of their complex refractive indices. The UTMF samples were imaged in the spectral range from 475 to 750 nm using the proposed LIM technique, and the model parameters were fitted to the measured data in order to determine the respective complex refractive indices for varying thicknesses. Overall, by using the combined intensity and phase not only for imaging and quality control but also for determining the material properties, such as complex refractive indices, this technique demonstrates a high potential for the characterization of the optical properties, of (semi-) transparent thin films.

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Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Multispectral Holographic Intensity and Phase Imaging of Semitransparent Ultrathin Films

Haegele,

Martínez-Cercós,

Arrés Chillón

et al. 2024

ACS Photonics

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Designing with very thin optical films

Willey¹,

Valavičius

Goldstein³

2020

Appl. Opt.

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There is increasing interest in the design of films with thicknesses on the order of 10 nm and less for a variety of applications, such as nanoparticles, plasmonics, quantum dots, solar reflectors, black mirrors, etc. The indices of refraction ( n and k ) for the effective media of such coatings depend on the materials with which such “layers” interface and the specific process parameters used to produce those films. The structures may typically be nucleating island structures and may also be continuous films. A key factor is that the n and k values vary in thickness until some thickness is obtained, usually > 20 n m . Heretofore, to the best of our knowledge, films have not taken into account thickness index variations during the design process. Software has now been developed where the index at a given thickness is computed at each iteration of the design optimization process. This allows more realistic design results utilizing the full representation of the behavior of the layers in question; the resulting coatings, when produced, are in better agreement with the designs. Including n and k versus wavelength and thickness in the design process is here referred to as double dispersion.

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Phonon-polaritonics: enabling powerful capabilities for infrared photonics

et al. 2019

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Here, we review the progress and most recent advances in phonon-polaritonics, an emerging and growing field that has brought about a range of powerful possibilities for mid- to far-infrared (IR) light. These extraordinary capabilities are enabled by the resonant coupling between the impinging light and the vibrations of the material lattice, known as phonon-polaritons (PhPs). These PhPs yield a characteristic optical response in certain materials, occurring within an IR spectral window known as the reststrahlen band. In particular, these materials transition in the reststrahlen band from a high-refractive-index behavior, to a near-perfect metal behavior, to a plasmonic behavior – typical of metals at optical frequencies. When anisotropic they may also possess unconventional photonic constitutive properties thought of as possible only with metamaterials. The recent surge in two-dimensional (2D) material research has also enabled PhP responses with atomically-thin materials. Such vast and extraordinary photonic responses can be utilized for a plethora of unusual effects for IR light. Examples include sub-diffraction surface wave guiding, artificial magnetism, exotic photonic dispersions, thermal emission enhancement, perfect absorption and enhanced near-field heat transfer. Finally, we discuss the tremendous potential impact of these IR functionalities for the advancement of IR sources and sensors, as well as for thermal management and THz-diagnostic imaging.

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Feature issue introduction: Beyond Thin Films: Photonics with Ultrathin and Atomically Thin Materials

Cited by 3 publications

References 87 publications

Multispectral Holographic Intensity and Phase Imaging of Semitransparent Ultrathin Films

Multispectral Holographic Intensity and Phase Imaging of Semitransparent Ultrathin Films

Designing with very thin optical films

Phonon-polaritonics: enabling powerful capabilities for infrared photonics

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