Fano-resonant ultrathin film optical coatings

ElKabbash, Mohamed; Letsou, Theodore; Jalil, Sohail A.; Hoffman, Nathaniel; Zhang, Jihua; Rutledge, James L.; Lininger, Andrew; Fann, Chun-Hao; Hinczewski, Michael; Strangi, Giuseppe; Chen, Guo

doi:10.1038/s41565-020-00841-9

Cited by 63 publications

(61 citation statements)

References 60 publications

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“…Introduction of loss in the film modifies the phases as shown by solid lines in Figure 4a. The plot demonstrates that in the ITER regime, the reflection phase at the top interface plays a dominant role in determining resonant interferences, which require ϕ 12 ¼ ϕ d , in contrast to those in Fabry-Perot resonances (which is determined by propagation phase in the film) and the previously investigated ultrathin film interferences [11][12][13][14][15][16][17][18][19][20] dominated by reflection phase at the bottom interface. Figure 4b plots the variation in magnitudes of r 12 and e 2iδ for real and lossless ENZ.…”

Section: Spectral and Angular Characteristics Of Infrared Absorptionmentioning

confidence: 90%

“…Such homogeneous ultrathin films are attractive for applications in coloring, filtering, absorption enhancement in photovoltaic applications, infrared absorbers and emitters, and in reconfigurable flat optics. [11][12][13][14][15][16][17][18][19][20] Epsilon-near-zero (ENZ) materials are one such class of thin film materials that have gained much interest in recent times. [21,22] The real part of permittivity (ε 0 ) of ENZ materials becomes zero at the zero-epsilon wavelength (λ ZE ), such that ε 0 is positive (negative) at shorter (longer) wavelengths.…”

Section: Introductionmentioning

confidence: 99%

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Tailoring Infrared Absorption and Thermal Emission with Ultrathin Film Interferences in Epsilon‐Near‐Zero Media

Johns

Chattopadhyay

Mitra

2021

Advanced Photonics Research

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Engineering modal dispersions of ultrathin, planar structures enables significant control over infrared perfect absorption (PA) and thermal emission characteristics. Herein, the optical response of ultrathin, low loss, epsilon‐near‐zero (ENZ) films on reflecting surfaces is simulated to investigate the wavelength and angular ranges over which they absorb and emit radiation most efficiently and identify the design parameters that tailor the ENZ mode dispersion of the system. A generic interference model is shown to elucidate the underlying physics of these ultrathin film absorption resonances, occurring well below the conventional quarter‐wavelength thickness limit. While the absorption is spectrally limited to wavelengths where the ENZ film is optically a dielectric with refractive index below unity, the angular spread is delimited by the material dispersion. Further, these resonant interferences are understood to arise from universal wave phenomena, realizable in simple planar structures having appropriate refractive index contrast, not restricted to ENZ materials. The results show that appropriate choice of material, film thickness and loss allows tailoring the modal dispersions, which enables precise directional control and wide tunability in spectral range (width ≈0.1–1.0 μm) of PA and thermal emission, paving the way towards efficient ENZ‐based infrared optical and thermal coatings.

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Section: Spectral and Angular Characteristics Of Infrared Absorptionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Tailoring Infrared Absorption and Thermal Emission with Ultrathin Film Interferences in Epsilon‐Near‐Zero Media

Johns

Chattopadhyay

Mitra

2021

Advanced Photonics Research

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“…[1][2][3] In particular thin-film metamaterials, metamaterials with varied material composition restricted to a single axis, have garnered widespread attention in the photonics community and are commonly utilized in applications such as optical coatings and sensors. 4,5 The engineered design of metamaterials sustaining a desired optical response in a given spectral range, termed inverse design (ID), is the basis for most optical applications. Successful metamaterial design requires the exploration of the global materials parameter space to engineer an optimized response.…”

Section: Introductionmentioning

confidence: 99%

General Inverse Design of Thin-Film Metamaterials With Convolutional Neural Networks

Lininger,

Hinczewski,

Strangi

2021

Preprint

Self Cite

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The design of metamaterials which support unique optical responses is the basis for most thin-film nanophotonics applications. In practice this inverse design problem can be difficult to solve systematically due to the large design parameter space associated with general multi-layered systems. We apply convolutional neural networks, a subset of deep machine learning, as a tool to solve this inverse design problem for metamaterials composed of stacks of thin films. We demonstrate the remarkable ability of neural networks to probe the large global design space (up to 10 12 possible parameter combinations) and resolve all relationships between metamaterial structure and corresponding ellipsometric and reflectance / transmittance spectra. The applicability of the approach is further expanded to include the inverse design of synthetic engineered spectra in general design scenarios. Furthermore, this approach is compared

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“…As a parallel research direction in nanophotonics, flat optics, including planar multilayer thin-film coatings, have also been extensively studied to exhibit various functionalities in spectral engineering, with large-area fabrication and simpler flat architecture. [6,[17][18][19] For example, typical metal-insulator-metal (MIM) nanocavity has been widely used to design color filters or perfect absorbers in the visible frequencies for transmission/reflection mode. [20][21][22][23] Based on the spectral characteristics of MIM patterns and grayscale exposure, [24] numerous studies have shown the micro-image nanoprinting functionality and the great potential in information storage/encryption at the nanoscale.…”

mentioning

confidence: 99%

Real‐Time Tunable Nanoprinting‐Multiplexing with Simultaneous Meta‐Holography Displays by Stepwise Nanocavities

Wang

Dai

Zhang

et al. 2021

Adv Funct Materials

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Although metasurface‐based devices exhibit great potential in optical display and storage technology, the challenges in practical nanoantenna fabrication limit their wide application. In parallel, flat optics, including planar thin‐film nanocavities, have also been extensively studied to realize various spectral engineering and imaging functionalities with large areas and simpler architecture. However, a longstanding practical challenge is to achieve multiplexing imaging functionalities with dynamic switchable ability in real‐time, which to date remains unexplored. In this study, by utilizing the typical inflation sensitivity of hydrogels to humidity change, a multiplexing imaging tunable strategy based on stepwise metal–hydrogel–metal (MHM) nanocavities is originally explored and demonstrated to exhibit dynamic switchable red–green–blue multichannel nanoprinting in real‐time. By decoupling the amplitude/phase correlation, MHM nanocavities successfully enable the hybrid encryption of simultaneous meta‐holography with independent‐encoding freedom in addition to multiplexing nanoprinting. Such an imaging approach, which employs a dynamic tuning scheme, paves a promising avenue toward various applications including state‐of‐the‐art tunable imaging display/storage/encryption, humidity optical sensors, and next‐generation dynamic augmented reality technology.

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Fano-resonant ultrathin film optical coatings

Cited by 63 publications

References 60 publications

Tailoring Infrared Absorption and Thermal Emission with Ultrathin Film Interferences in Epsilon‐Near‐Zero Media

Tailoring Infrared Absorption and Thermal Emission with Ultrathin Film Interferences in Epsilon‐Near‐Zero Media

General Inverse Design of Thin-Film Metamaterials With Convolutional Neural Networks

Real‐Time Tunable Nanoprinting‐Multiplexing with Simultaneous Meta‐Holography Displays by Stepwise Nanocavities

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