Large‐Area Low‐Cost Tunable Plasmonic Perfect Absorber in the Near Infrared by Colloidal Etching Lithography

Walter, Rudolf; Tittl, Andreas; Berrier, Audrey; Sterl, Florian; Weiß, Thomas; Gießen, Harald

doi:10.1002/adom.201400545

Cited by 78 publications

(52 citation statements)

References 34 publications

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“…This offers significantly improved performance compared to Walter et al who presented reflection changes in Pd nanodiscs or Tittl et al who demonstrated perfect absorbers in Pd gratings, who both reported reflection ratios of <1000. 50,51 As above, it is interesting to note that the structures involving Ti exhibit unique behavior amongst the materials we investigated. The resonances in the Ti devices shift to shorter wavelengths after the hydrogenation reaction due to the increase in refractive index, in contrast to the red shifts demonstrated with the other two metals.…”

Section: Tunable Nanophotonics With Metal Hydridesmentioning

confidence: 81%

Dynamic Optical Properties of Metal Hydrides

et al. 2018

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Metal hydrides often display dramatic changes in optical properties upon hydrogenation. These shifts make them prime candidates for many tunable optical devices, such as optical hydrogen sensors and switchable mirrors. While some of these metals, such as palladium, have been well studied, many other promising materials have only been characterized over a limited optical range and lack direct in situ measurements of hydrogen loading, limiting their potential applications. Further, there have been no systematic studies that allow for a clear comparison between these metals. In this work, we present such a systematic study of the dynamically tunable optical properties of Pd, Mg, Zr, Ti, and V throughout hydrogenation with a wavelength range of 250 -1690 nm. These measurements were performed in an environmental chamber, which combines mass measurements via a quartz crystal microbalance with ellipsometric measurements in up to 7 bar of hydrogen gas, allowing us to determine the optical properties during hydrogen loading. In addition, we demonstrate a further tunability of the optical properties of titanium and its hydride by altering annealing conditions, and we investigate the optical and gravimetric hysteresis that occurs during hydrogenation cycling of palladium. Finally, we demonstrate several nanoscale optical and plasmonic structures based on these dynamic properties. We show structures that, upon hydrogenation, demonstrate five orders of magnitude change in reflectivity, resonance shifts of >200 nm, and relative transmission switching of >3000%, suggesting a wide range of applications.

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Section: Tunable Nanophotonics With Metal Hydridesmentioning

confidence: 81%

Dynamic Optical Properties of Metal Hydrides

et al. 2018

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“…Metamaterial perfect absorbers (MPAs) possess exotic EM radiative properties, which may open up potential applications in the signature control of military targets to evade detection, such as in tanks, aircrafts, and ships by acting as radar absorbers, selective emitters, and infrared (IR) camouflage . To achieve perfect absorption at a specific wavelength, metal–dielectric–metal (MDM) structured metamaterials harness the inevitable loss that is present in all real‐life applications. In principle, perfect absorption is achieved in an MDM structure by: 1) obtaining zero reflection by matching the impedance; 2) obtaining zero transmission by using the metal ground, and 3) obtaining perfect absorption by maximizing the losses.…”

Section: Introductionmentioning

confidence: 99%

Hierarchical Metamaterials for Multispectral Camouflage of Infrared and Microwaves

Kim

Bae

Lee

et al. 2019

Adv Funct Materials

191

171

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Camouflage is an emerging application of metamaterials owing to their exotic electromagnetic radiative properties. Based on the use of a selective emitter and an absorber as the metamaterials, most reported articles have suggested the use of single‐band camouflage, however, multispectral camouflage is a challenging issue owing to a difference of several orders of magnitude in the unit cell structure. Herein, hierarchical metamaterials (HMMs) for multispectral signal control when dissipating the absorbed energy of microwaves through the selective emission of infrared (IR) waves from the unit cell structure of the HMM are demonstrated. Integrating an IR selective emitter (IRE) with a microwave selective absorber, multispectral signal control with the large‐sized unit cell structures of up to 10 cm are realized. With an IRE, the emissive power from the HMM toward 5–8 µm is 1570% higher than the Au surface, which is preventing the occurrence of thermal instability. Furthermore, we determine that the signature levels of targeted IR waves (8–12 µm) and microwaves (2.5–3.8 cm) are reduced by up to 95% and 99%, respectively, when applying the HMM.

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“…Meanwhile, the self‐assembled spheres (or after a particular modification) can also be used as templates to produce various nanostructures in conjugation with different etching or deposition steps. This method, known as CL, has been well established in recent years, and is now recognized as a low‐cost, high‐throughput, scalable, and repeatable nanofabrication technique. In this work, a strategy based on CL has been developed to produce periodic nanohole arrays of a photoreconfigurable polymer deposited on a gold surface.…”

Section: Resultsmentioning

confidence: 99%

Large‐Area Fabrication of Highly Tunable Hybrid Plasmonic–Photonic Structures Based on Colloidal Lithography and a Photoreconfigurable Polymer

Wang

Dong

Sun

et al. 2019

Advanced Optical Materials

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In this work, based on colloidal lithography, a strategy is developed to produce a new type of hybrid plasmonic–photonic system comprising a periodic array of nanoholes in a photoreconfigurable polymer layer deposited on a gold surface. By controlling the experimental conditions, the geometric parameters of the nanoholes can be easily adjusted; hence, the optical properties of the systems are widely tunable. Importantly, the shape and topology of the round nanohole arrays can be easily reconfigured with proper photoirradiation, providing a means to modulate the optical properties and produce new functionalities, as exemplified by the formation of arrays with anisotropic or gradient structural features. Moreover, rubbing dielectric spheres into the formed nanoholes can further tune the topological structures of the dielectric components in the hybrid system, leading to a dramatic modification of the spatial energy distributions and inducing the formation of uniform electromagnetic fields confined near the embedded sphere surfaces, which are more beneficial for practical applications. All the results indicate that the combined use of the unique properties of both a photoreconfigurable polymer and colloidal lithography opens a new avenue with great potential for efficient and large‐area fabrication of hybrid plasmonic–photonic systems with a high degree of optical tunability.

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Large‐Area Low‐Cost Tunable Plasmonic Perfect Absorber in the Near Infrared by Colloidal Etching Lithography

Cited by 78 publications

References 34 publications

Dynamic Optical Properties of Metal Hydrides

Dynamic Optical Properties of Metal Hydrides

Hierarchical Metamaterials for Multispectral Camouflage of Infrared and Microwaves

Large‐Area Fabrication of Highly Tunable Hybrid Plasmonic–Photonic Structures Based on Colloidal Lithography and a Photoreconfigurable Polymer

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