Adaptive visible and short-wave infrared camouflage using a dynamically tunable metasurface

Buhara, Ebru; Ghobadi, Amir; Özbay, Ekmel

doi:10.1364/ol.439435

Cited by 16 publications

(4 citation statements)

References 18 publications

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“…Compared to multispectral imaging, high spectral imaging offers higher spectral resolution, enabling the capture of hundreds to thousands of spectral channels in the target wavelength range, thus acquiring continuous spectral information. Despite the growing demand for transmissive filters in the visible range [9], [10], [11], [12], [13], most studies have focused on reflection filters in the infrared band [14], [15], [16], [17], [18], [19]. Existing transmission filters in the visible range suffer from limitations including low diffraction efficiency, wide FWHM, and high sidebands, which lead to structural color issues such as reduced saturation and accuracy of color resolution.…”

Section: Introductionmentioning

confidence: 99%

Ultra-Narrowband High-Transmissivity Guided-Mode Resonance Filter Based on Dual Dielectric Film Structure and High Refractive Index Waveguide Layer

Gao,

Zhang,

et al. 2024

IEEE Photonics J.

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In this study, we propose a novel approach to achieve an ultra-narrow bandwidth and high transmittance filter in the visible range. By employing TiO2 as the waveguide layer material, the coupling energy in the waveguide layer is enhanced, leading to a reduction in the full width half maximum (FWHM). Additionally, a double-layer dielectric film structure composed of SiO2 and Al2O3 is employed on the Ag grating to suppress random scattering leakage in the short wavelength range, resulting in reduced sidebands and improved transmittance of the resonant peak. To minimize wave loss between the metal grating and the waveguide layer, a SiO2 dielectric layer is introduced. By adjusting the metal grating period, the resonance peak position can be shifted across the entire visible range. The proposed approach offers a metal grating-based guided-mode resonance (GMR) transmissive filter with low sidebands, high transmittance, ultra-narrow bandwidth, and tunability in the entire visible range. Experimental validation of the proposed design is conducted, and the results demonstrate the effectiveness of this approach in achieving superior filter performance in the visible spectral range.

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Section: Introductionmentioning

confidence: 99%

Ultra-Narrowband High-Transmissivity Guided-Mode Resonance Filter Based on Dual Dielectric Film Structure and High Refractive Index Waveguide Layer

Gao,

Zhang,

et al. 2024

IEEE Photonics J.

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“…Zhu et al [ 24 ], combining silica aerogel and 1D-PCs, developed a high-temperature IR camouflage material with efficient thermal management. With metasurfaces, a metal-insulator-metal (MIM) structure with highly tunable selective absorption/emission has been studied for IR stealth [ 9 , 27 , 28 , 29 , 30 , 31 ]. Namkyu et al [ 28 ] designed a disc-shaped MIM metasurface using Au/ZnS material to compatibly achieve IR stealth and thermal management.…”

Section: Introductionmentioning

confidence: 99%

“…To realize multi-band compatible IR stealth and radiative thermal management, the Rigorous Coupled Wave Analysis (RCWA) [ 47 ] and a trained BNN model are combined to optimize the geometrical parameters of the metasurface. We note that Ge and Ag have been widely used as common IR materials for the design of IR selective emitters [ 6 , 9 , 24 , 25 , 30 ]. The optimized metasurface achieves multi-band IR stealth with low emission in the two atmospheric windows (

= 0.12 and

= 0.17), narrow-band high absorption at the near-infrared laser wavelength (

= 0.88), and ensuring the need for radiative thermal management in the non-atmospheric window (

= 0.61).…”

Section: Introductionmentioning

confidence: 99%

Deep Learning Assisted Optimization of Metasurface for Multi-Band Compatible Infrared Stealth and Radiative Thermal Management

et al. 2023

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Infrared (IR) stealth plays a vital role in the modern military field. With the continuous development of detection technology, multi-band (such as near-IR laser and middle-IR) compatible IR stealth is required. Combining rigorous coupled wave analysis (RCWA) with Deep Learning (DL), we design a Ge/Ag/Ge multilayer circular-hole metasurface capable of multi-band IR stealth. It achieves low average emissivity of 0.12 and 0.17 in the two atmospheric windows (3~5 μm and 8~14 μm), while it achieves a relatively high average emissivity of 0.61 between the two atmospheric windows (5~8 μm) for the purpose of radiative thermal management. Additionally, the metasurface has a narrow-band high absorptivity of 0.88 at the near-infrared wavelength (1.54 μm) for laser guidance. For the optimized structure, we also analyze the potential physical mechanisms. The structure we optimized is geometrically simple, which may find practical applications aided with advanced nano-fabrication techniques. Also, our work is instructive for the implementation of DL in the design and optimization of multifunctional IR stealth materials.

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“…As a two-dimensional planar metamaterial form, metasurfaces are also demonstrated remarkable characteristics in various application areas [7][8][9][10][11][12]. Control and manipulation of the emergent electromagnetic wavefront are one of the signi cant implementations of the metasurfaces in the optical device technologies [13].…”

Section: Introductionmentioning

confidence: 99%

Thermally Tunable Infrared Metalens Using Phase Change Material

Buhara

Ghobadi

Özbay

2022

Preprint

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Metamaterials and their two-dimensional forms, metasurfaces, have been studied intensively due to their unique features that usually do not exist in nature. Due to their unusual properties, they have found their way into many different application areas. One of these application areas is metalens application, where the metasurfaces are formed as flat lenses and they bend the wavefront of the outgoing electromagnetic wave. Metalenses are a candidate to replace the spherical lenses because they are much smaller, they are easy to fabricate, and they are a solution to aberration problems. In this paper, a metalens structure with \(11 \mu\)m operating wavelength is studied. In addition to working at the long infrared wavelength, the dynamic feature is brought to the metalens with the addition of vanadium dioxide, and power control at the focal point is obtained.

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Adaptive visible and short-wave infrared camouflage using a dynamically tunable metasurface

Cited by 16 publications

References 18 publications

Ultra-Narrowband High-Transmissivity Guided-Mode Resonance Filter Based on Dual Dielectric Film Structure and High Refractive Index Waveguide Layer

Ultra-Narrowband High-Transmissivity Guided-Mode Resonance Filter Based on Dual Dielectric Film Structure and High Refractive Index Waveguide Layer

Deep Learning Assisted Optimization of Metasurface for Multi-Band Compatible Infrared Stealth and Radiative Thermal Management

Thermally Tunable Infrared Metalens Using Phase Change Material

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