Impact of ordering of gold nanohole arrays on refractive index sensing

S, Brindhu Malani; Viswanath, P.

doi:10.1364/josab.35.002501

Cited by 22 publications

(10 citation statements)

References 55 publications

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“…As increases, the width of the EOT peak decreases, which means better resolution in the case of using nano hole array as a refractive index sensitive sensor. The formation of multipolarity in the dip frequency is visible to all cases in figure 2.b., which confirms the hypothesis that LSPR leads to scattering or absorption resulting in transmission dips [33]. These kinds of dips imply an asymmetry in the shape of EOT peaks.…”

Section: I: Effect Of Hole Size On Optical Transmissionsupporting

confidence: 85%

Engineering the Optical Response of the Novel Plasmonic Binary Nanohole Array

Javidnasab

Azadi

Legha

et al. 2021

Preprint

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The phenomenon of extraordinary optical transmission (EOT) due to its advantages has been considered by researchers in various applications and in recent years many efforts have been made to engineer these structures to get the best possible response for desired applications. In this work, the optical properties of novel binary gold nano-hole arrays are investigated theoretically. We engineered the optical response of the system by adjusting the ratio of contribution of surface plasmon polariton (SPP) to localized surface plasmon resonance (LSPR) through the manipulation of the geometrical properties. The changes in the topology of this nano-hole array affected the intensity and the wavelength of transmission peaks. The sensitivity of the optical response to the refractive index was also investigated. The designed structure is a good candidate for use as a polarization-independent optical label-free sensor.

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Section: I: Effect Of Hole Size On Optical Transmissionsupporting

confidence: 85%

Engineering the Optical Response of the Novel Plasmonic Binary Nanohole Array

Javidnasab

Azadi

Legha

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…The formation of multipolarity in the dip frequency is visible to all cases in Fig. 2b, which confirms the hypothesis that LSPR leads to scattering or absorption resulting in transmission dips [44]. These kinds of dips imply an asymmetry in the shape of EOT peaks.…”

Section: Effect Of Hole Size On Optical Transmissionsupporting

confidence: 82%

Engineering the Optical Response of the Novel Plasmonic Binary Nanohole Array

et al. 2021

View full text Add to dashboard Cite

The phenomenon of extraordinary optical transmission (EOT) due to its advantages has been considered by researchers in various applications, and in recent years, many efforts have been made to engineer these structures to get the best possible response for desired applications. In this work, the optical properties of novel binary gold nanohole arrays are investigated theoretically. We engineered the optical response of the system by adjusting the ratio of contribution of surface plasmon polariton (SPP) to localized surface plasmon resonance (LSPR) through the manipulation of the geometrical properties. The changes in the topology of this nanohole array affected the intensity and the wavelength of transmission peaks. The sensitivity of the optical response to the refractive index was also investigated. The designed structure is a good candidate for use as a polarization-independent optical label-free sensor.

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“…We fabricated arrays of gold nanotriangles and nanoholes using colloidal lithography, which is reported in detail elsewhere. 35 Briefly, we prepared the PS monolayer on the silicon substrate using the evaporation-induced convective self-assembly technique. This is followed by sintering at 110 °C for 1 min.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Wettability Contrast in the Hexagonally Patterned Gold Substrate of Distinct Morphologies for Enhanced Fog Harvesting

Viswanath

2021

Langmuir

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Inspired by the Stenocara beetle’s hydrophobic–hydrophilic surface, we fabricated hexagonally patterned hydrophobic–hydrophilic surfaces consisting of silicon and gold regions using colloidal lithography and selective surface functionalization. We investigated surface wettability for different patterns (hexagonally ordered nanotriangles and nanoholes) and the influence of surface functionalization (octadecanethiol and 16-mercaptohexadecanoic acid/octadecyltrichlorosilane (MHA/OTS)). The as-prepared patterned substrates exhibit hydrophilicity, which transforms to hydrophobicity after surface functionalization. The MHA/OTS functionalization results in maximum enhancement in the contact angle (114 ± 0.4°) with the least contact angle hysteresis (19 ± 2°). Fog harvesting studies show that the patterned substrate has a higher water collection rate, a factor of 1.32, than the nonpatterned substrates. A further enhancement in water collection (almost twice) is observed with selective functionalization. The patterned (nanohole) and functionalized (MHA/OTS) substrate facilitates rapid falling of droplets at a frequency of 20 mHz and an average droplet mass of 15 ± 2 mg/cm2. Furthermore, it yielded a maximum water collection rate of 1051 ± 132 mg cm–2 h–1. This work provides valuable insights into the influence of surface wettability and morphology for fog harvesting applications.

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Impact of ordering of gold nanohole arrays on refractive index sensing

Cited by 22 publications

References 55 publications

Engineering the Optical Response of the Novel Plasmonic Binary Nanohole Array

Engineering the Optical Response of the Novel Plasmonic Binary Nanohole Array

Engineering the Optical Response of the Novel Plasmonic Binary Nanohole Array

Wettability Contrast in the Hexagonally Patterned Gold Substrate of Distinct Morphologies for Enhanced Fog Harvesting

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