Ag Nanostructures Produced by Glancing Angle Deposition with Remarkable Refractive Index Sensitivity

Abbasian, Sara; Moshaii, Ahmad; Vayghan, Nader Sobhkhiz; Nikkhah, Maryam

doi:10.1007/s11468-016-0308-0

Cited by 7 publications

(4 citation statements)

References 43 publications

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“…GLAD allows the fabrication of many plasmonic nanostructures by controlling different deposition parameters, such as the deposition angle of the substrate, the direction and velocity of substrate rotation, and deposition rate. The substrate's tilt angle mainly affects the plasmonic nanostructures ' size, interspace, and growth angle for a fixed substrate rotation speed (2-20 rpm); meanwhile, a low substrate rotation rate promotes the formation of nanohelix with chiral plasmonic activity (Abbasian et al, 2016;Jen et al, 2016). The precise control and the combination of the different deposition parameters allow changing the final geometry of the nanostructures.…”

Section: Plasmonic Metasurfaces By Glancing Angle Deposition For Bios...mentioning

confidence: 99%

Scalable, Lithography-Free Plasmonic Metasurfaces by Nano-Patterned/Sculpted Thin Films for Biosensing

et al. 2022

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Scientific research in plasmonic metasurfaces has been widely widespread in the last years, motivated by the recent advances in the nanofabrication field and the increasing demand for high throughput sensing platforms. The recent advances in electronics, microfluidics, and signal processing have enabled the complete development of highly integrated devices with broad application potential. However, the progress observed from a fabrication point of view has been remarkable, led by the potential benefits metamaterials can offer in plasmonic sensing: sensor miniaturization, multiplexing opportunities, and extreme sensitivity biodetection. Although conventional top-down approaches, i.e., electron-beam lithography, have been extensively employed to develop plasmonic metasurfaces for biosensing, lithography-free bottom-up nanofabrication strategies based on nano-patterned/sculpted thin-films are candidates to surpass the limitations of top-down lithographic techniques with large-scale and high-throughput fabrication processes for 2D and 3D plasmonic metasurfaces over a broad material set. This perspective paper focuses on the challenges and opportunities to achieve lithography-free plasmonic metasurfaces by nano-patterned/sculpted thin films to conduct scalable and high-throughput plasmonic metamaterials for sensitive biosensing platforms.

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Section: Plasmonic Metasurfaces By Glancing Angle Deposition For Bios...mentioning

confidence: 99%

Scalable, Lithography-Free Plasmonic Metasurfaces by Nano-Patterned/Sculpted Thin Films for Biosensing

et al. 2022

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“…Yet, since the size distribution that can be obtained are in the range up to 40 nm, and the nanoparticles are mostly spherical, this might hinder the signal and sensitivity of the plasmonic sensor. On the other hand, this effect can be mitigated, for example, (i) by partially exposing the nanoparticles that are initially embedded in the matrix, using low vacuum plasma etching [166][167][168][169], or (ii) by developing nanostructured thin films deposited by glancing angle deposition (GLAD) [170,171], which may allow for increasing the availability of adsorption sites for analyte molecules and to produce nanoparticles with higher aspect ratios, and thus to be more sensitive [172,173].…”

Section: Thermal Annealing To Promote Gold Nanoparticle Growthmentioning

confidence: 99%

Gas Sensors Based on Localized Surface Plasmon Resonances: Synthesis of Oxide Films with Embedded Metal Nanoparticles, Theory and Simulation, and Sensitivity Enhancement Strategies

et al. 2021

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This work presents a comprehensive review on gas sensors based on localized surface plasmon resonance (LSPR) phenomenon, including the theory of LSPR, the synthesis of nanoparticle-embedded oxide thin films, and strategies to enhance the sensitivity of these optical sensors, supported by simulations of the electromagnetic properties. The LSPR phenomenon is known to be responsible for the unique colour effects observed in the ancient Roman Lycurgus Cup and at the windows of the medieval cathedrals. In both cases, the optical effects result from the interaction of the visible light (scattering and absorption) with the conduction band electrons of noble metal nanoparticles (gold, silver, and gold–silver alloys). These nanoparticles are dispersed in a dielectric matrix with a relatively high refractive index in order to push the resonance to the visible spectral range. At the same time, they have to be located at the surface to make LSPR sensitive to changes in the local dielectric environment, the property that is very attractive for sensing applications. Hence, an overview of gas sensors is presented, including electronic-nose systems, followed by a description of the surface plasmons that arise in noble metal thin films and nanoparticles. Afterwards, metal oxides are explored as robust and sensitive materials to host nanoparticles, followed by preparation methods of nanocomposite plasmonic thin films with sustainable techniques. Finally, several optical properties simulation methods are described, and the optical LSPR sensitivity of gold nanoparticles with different shapes, sensing volumes, and surroundings is calculated using the discrete dipole approximation method.

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“…Therefore, nano rods are anisotropic structures whose properties can be controlled by controlling the deposition condition. So far, various metal nanorods such as silver, [28][29][30][31][32][33][34] gold, [35][36][37] aluminum, [38][39][40] copper, [41][42][43] magnesium [44] titanium, [45] manganese, [46] nickel, [47] cobalt, [48] cadmium, [49] silicon, [50] germanium, [51] and metal oxides such as titanium oxide, [52] cadmium oxide, [53] calcium oxide, SnO 2 [54] Y 2 O 3 , [55] SiO 2 , [56] zinc oxide [57][58][59][60][61][62][63] have been formed with different deposition conditions and their optical and electrical properties have been investigated. Studying the structure that is a combination of two types of materials can be more interesting, which is discussed in this work.…”

Section: Introductionmentioning

confidence: 99%

On the structural and optical properties investigation of annealed Zn nanorods in the oxygen flux*

Abdi¹

2021

Chinese Phys. B

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Zn nano rods were produced on glass substrates using oblique angle deposition method at different deposition angles. For oxidation, the samples were placed in a furnace under oxygen flux. AFM and FESEM images were used to morphology analysis of the structures. The results showed that with increasing the angle of deposition, the grain size decreases and the porosity of the structures increases. XRD pattern and XPS depth profile analysis were used to crystallography and oxide thickness investigations, respectively. The XRD results confirmed oxide phase formation, and the XPS results analyzed the oxide layer thickness. The result showed that as the deposition angle of the nanorods increases, the thickness of the oxide layer increases. The reason for the increase in the thickness of the oxide layer with increasing deposition angle was investigated and attributed to the increase in the porosity of the thin films. The optical spectra of the structures for p polarized light at 10° incident light angle were obtained using single beam spectrophotometer in the 300 nm to 1000 nm wavelengths. The results showed that the formed structures although annealed in oxygen flux, tend to behave like metal. To calculate the optical constant of the structures, the reverse homogenization theory was used and the void fraction and complex refractive index of the structures were obtained. Finally, by calculating permittivity and optical conductivity of the structures, their changes with the deposition angle were investigated.

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Ag Nanostructures Produced by Glancing Angle Deposition with Remarkable Refractive Index Sensitivity

Cited by 7 publications

References 43 publications

Scalable, Lithography-Free Plasmonic Metasurfaces by Nano-Patterned/Sculpted Thin Films for Biosensing

Scalable, Lithography-Free Plasmonic Metasurfaces by Nano-Patterned/Sculpted Thin Films for Biosensing

Gas Sensors Based on Localized Surface Plasmon Resonances: Synthesis of Oxide Films with Embedded Metal Nanoparticles, Theory and Simulation, and Sensitivity Enhancement Strategies

On the structural and optical properties investigation of annealed Zn nanorods in the oxygen flux*

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