Engineering of metallic nanorod-based hyperbolic metamaterials for broadband applications operating in the infrared regime

Baqir, M. A.; Farmani, Ali; Raza, Muhammad Qamar; Akhtar, Majid Niaz; Hussain, Arshad

doi:10.1007/s13204-020-01574-w

Cited by 12 publications

(4 citation statements)

References 53 publications

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“…Pre-coating of a thin carbon layer can only induce a slight increase in the oscillation amplitude (Figure e). Within the scope of metasurfaces, Baqir et al observed the oscillated NIR-reflectance of Ti-rod/SiO 2 hyperbolic metamaterials at room temperature, different from the non-oscillated NIR-reflectance at room temperature for fs-LAL-produced macropore/LIPSS micro/nanostructures shown in Figure a. Hence, it is deduced that the reflectance oscillation should be mainly associated with the thermal effect.…”

Section: Results and Discussionmentioning

confidence: 99%

Femtosecond Laser Generated Hierarchical Macropore/LIPSS Metasurfaces and Their Ultrabroadband Absorbance, Photothermal Properties, and Thermal-Induced Reflectance Oscillation

Liu

Zhang

et al. 2022

ACS Appl. Electron. Mater.

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As an emerging versatile technique, femtosecond laser structuring has shown its superior capacity to develop hierarchical micro/nanostructures. In this work, macropore/LIPSS micro/nanostructures (LIPSS: laser induced periodic surface structure) prepared by femtosecond laser ablation (fs-LA) of titanium in air are confirmed to be multifunctional metasurfaces, enabling ultrabroadband UV−vis−NIR− MIR absorbance, photothermal conversion, and thermal-emission induced reflectance oscillation. Different laser powers (2, 5, 8, and 15 W) and scanning velocities (50, 100, 200, and 400 mm/s) were adopted to tune the density/size of macropores, which gives the opportunities to evaluate their impact on multifunctions. It is found that macropore/ LIPSS structures with larger and deeper macropores possess the best performances for all functions. Reflectance (absorbance = 1 − reflectance) is used as the absorbance indicator for as-prepared opaque samples. A maximal >90% absorbance in the UV−vis−NIR range (0.2−2.5 μm) and >60% absorbance in the MIR range (2.5−16 μm) are achieved due to synergistic metasurface and structural effects, much better than many metal/dielectric metasurface absorbers prepared by lithography-based techniques. The photothermal conversion capacity of Ti substrates can be significantly enhanced after hierarchical micro/nanostructuring, as evidenced by the maximal detectable temperatures of 127 and 50 °C from the ablated/unablated samples after 8 min high-density light irradiation. Pre-coating of a 15 nm thick carbon layer on Ti substrates for fs-LA can effectively increase ablation efficiency to enlarge the macropore size and endow more carbon to the resultant structures, which are beneficial to achieve higher photothermal converters, as indicated by the temperature increase up to 147 °C, making them good candidates for sterilization applications. Multifunctions reported in this work including the first discovery of thermal-induced reflectance oscillation phenomenon for macropore/LIPSS structures prove that fs-LA is a one-step cost-effective technique for multifunctional metasurface manufacturing.

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Section: Results and Discussionmentioning

confidence: 99%

Femtosecond Laser Generated Hierarchical Macropore/LIPSS Metasurfaces and Their Ultrabroadband Absorbance, Photothermal Properties, and Thermal-Induced Reflectance Oscillation

Liu

Zhang

et al. 2022

ACS Appl. Electron. Mater.

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“…Miniaturization of Au substrate opens up two new horizons, i.e. (i) localized surface plasmon resonance (LSPR) [11] and (ii) hyperbolic metamaterial (HMM) property [12,13], over a broad wavelength, ranging from visible to near-infrared (NIR) region. At resonance, i.e.…”

Section: Introductionmentioning

confidence: 99%

Electroplating-based engineering of plasmonic nanorod metamaterials for biosensing applications

Sahoo

Kumar

2023

Nanotechnology

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Sensing lower molecular weight in a diluted solution using a label-free biosensor is challenging and requires a miniaturized plasmonic structure, e.g., a vertical Au nanorod (AuNR) array based metamaterials. The sensitivity of a sensor mainly depends on transducer properties and hence for instance, the AuNR array geometry requires optimization. Physical vapour deposition methods (e.g., sputtering and e-beam evaporation) require a vacuum environment to deposit Au, which is costly, time-consuming, and thickness-limited. On the other hand, chemical deposition, i.e., electroplating deposit higher thickness in less time and at lower cost, becomes an alternative method for Au deposition. In this work, we present a detailed optimization for electroplating based fabrication of these metamaterials. We find that slightly acidic (6.0 < pH < 7.0) gold sulfite solution supports immersion deposition, which should be minimized to avoid uncontrolled Au deposition. Immersion deposition leads to plate-like (for smaller radius AuNR) or capped-like, i.e., mushroom (for higher radius AuNR) structure formation. The electroplating time and DC supply are the tuning parameters that decide the geometry of the vertically aligned AuNR array in area-dependent electroplating deposition. This work will have implications for developing plasmonic metamaterial based sensors.

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“…Clinical malformations in the mammal glands and tissues of cattle and the physical and chemical variations in milk are all related to mastitis (Niu et al, 2017). Infectious bacteria, Staphylococcus aureus of the gram-positive type and Escherichia coli of the gramnegative kind have been associated with mastitis in livestock and are also known to cause diarrhea and nosocomial infections in human beings (Haider et al, 2020a;Baqir et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Dye degradation, antimicrobial activity, and molecular docking analysis of carbon sphere and graphene oxide–doped aluminum oxide

Arshad

Imran

Haider

et al. 2023

Front. Environ. Sci.

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In this research work, pristine and various concentrations (2.4 wt%) of graphene oxide (GO)/carbon sphere (CS)–doped Al2O3 nanostructures (NSs) were synthesized with the chemical sol–gel method. Aluminum oxide (Al2O3) exhibits quick recombination of electrons and holes with a low specific surface to limit catalytic and antibacterial activities. Al2O3 doped with CS is good in wastewater treatment and reduces the size of NSs. The incorporation of graphene oxide (GO) into Al2O3 at different concentrations (2 and 4 wt%) enhances both the structural and chemical stabilities of the resulting material while concurrently decreasing the number of charge carriers and reducing the band gap energy. This modified Al2O3-GO composite exhibits promising potential for utilization in dye degradation and antibacterial activity. A series of characterizations were performed to investigate the structural, morphological, and optical properties. The NSs exhibited excellent catalytic activity (CA) against rhodamine B (RhB) dye in acidic, basic, and neutral media. The antimicrobial activity was tested against Escherichia coli. Pairs of electrons and holes are the primary building blocks for the production of reactive oxygen species (ROS), which causes bacteria to die. The significant inhibition zones against E. coli were calculated to be approximately 5.65 mm when compared to ciprofloxacin. Moreover, in silico investigations have revealed the possible inhibitory impact of produced nanomaterials (GO/CS-doped Al2O3) on DNA gyrase and FabI enzymes of fatty acid biosynthesis.

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Engineering of metallic nanorod-based hyperbolic metamaterials for broadband applications operating in the infrared regime

Cited by 12 publications

References 53 publications

Femtosecond Laser Generated Hierarchical Macropore/LIPSS Metasurfaces and Their Ultrabroadband Absorbance, Photothermal Properties, and Thermal-Induced Reflectance Oscillation

Femtosecond Laser Generated Hierarchical Macropore/LIPSS Metasurfaces and Their Ultrabroadband Absorbance, Photothermal Properties, and Thermal-Induced Reflectance Oscillation

Electroplating-based engineering of plasmonic nanorod metamaterials for biosensing applications

Dye degradation, antimicrobial activity, and molecular docking analysis of carbon sphere and graphene oxide–doped aluminum oxide

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