Plasmonic Bandgap in 1D Metallic Nanostructured Devices

Javaid, Muhammad; Iqbal, Tahir

doi:10.1007/s11468-015-0025-0

Cited by 27 publications

(7 citation statements)

References 45 publications

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“…The effect of phase shift at each boundary produced by tangential components is considered using Floquent periodicity in combination with PBCs. These components of EM fields of a model are ensured by continuity boundary conditions (CBCs) which represent the interior boundaries of that model [32][33][34][35][36][37][38]. The incident wave vector, designation boundary to source distance and material properties have significant effect on phase shift.…”

Section: Numerical Modellingmentioning

confidence: 99%

Investigation of Surface Plasmon Polaritons based Gas sensor: Far and Near field Analysis

Afsheen

Iqbal

Khalid

et al. 2021

Preprint

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This research work reports the plasmonic-based biosensing using attenuated total reflection (ATR). A photon beam falls on the metallic film through an angle higher than critical angle of glass. SPPs are produced along the metal/analyte interface. An optimum gold (Au) film has been used to sense the refractive index of analyte lying next to it while utilizing the sensitivity power of electric field of the surface plasmon polaritons (SPPs). Such Nanoplasmonic devices have been designed and optimized utilizing finite element analysis (FEA) in licensed version of COMSOL 5.4, RF module. Reflection spectra have been extracted for far-field analysis, whereas shift in the position of SPP dip has been exploited to compute sensitivity of the device. By controlling the film thickness and angle of light incidence, the sensitivity of the device is enhanced. It is worth mentioning that the spectral range was brought in visible region where most of the practical devices work very well. The sensitivity of 18200 nm/RIU has been achieved for optimum angle and gold film thickness. Hence such devices have various sensing applications in medical diagnostics.

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Section: Numerical Modellingmentioning

confidence: 99%

Investigation of Surface Plasmon Polaritons based Gas sensor: Far and Near field Analysis

Afsheen

Iqbal

Khalid

et al. 2021

Preprint

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“…In this research work, importance of plasmonics for photocatalytic applications by using different plasmonic nanostructures is presented here in contrast to earlier work [5][6][7][8][9]. The process of photocatalysis mainly used the semiconductors for the absorption of photons to make electron-hole pairs for the reduction and oxidation of chemicals.…”

Section: Introductionmentioning

confidence: 99%

Study of Enhanced Photocatalytic Efficiency by Field Confinement in Plasmonic Nanostructures for Their Potential Application for Detection of Pathogenic Bacteria

Qureshi

Tehseen

Iqbal

et al. 2023

Preprint

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The interaction of transverse magnetic (TM) plane waves with 1D metallic bowtie gratings on glass substrate has been used for surface plasmon polaritons (SPPs) excitation. Silver (Ag) bowtie metallic grating has been modelled in COMSOL Multiphysics 5.6 Licensed version, for different gap widths (GWs) and film thickness by keeping the periodicity constant. The 0th order transmission spectra for this grating with various geometrical parameters at normal incidence has been extracted and studied by far-field analysis. To check the photocatalytic enhancement, the method of enhanced field confinement is used by exciting SPPs at TiO2/air interface. The enhancement factor is examined by changing gap width (50nm-450nm) with fixed thickness and periodicity. The photocatalytic efficiency is also calculated and degradation of three dyes (Methyl Red (MR), Methyl Orange (MO) and Phenol (Ph)) by calculating their concentrations and photodegradation rate constant ‘k’ are studied as well. Far and near-field analysis are employed to study the optimum structure for effective absorption of light. The results of far-field are supported by applying near-field analysis at resonance wavelength. A brief comparison of enhancement factor and photocatalytic degradation with literature is also presented. This research provides a pathway to real-time applications which are helpful in fabrication of efficient plasmonic based photocatalytic devices for highest degradation efficiency. Such grating devices with optimized parameters can also be used in the field of medical such as biosensor - detection and inhibition of the Pathogenic Bacteria etc.

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“…In fact the first two sentences play a key role: the g k component provides photon-plasmon coupling while 2 g k component yields the gap. Javaid and Iqbal [7] in their paper have interpreted the plasmonic bandgap by dividing the energy region in dispersion relation curve. They mentioned that at lower energies, SPP has dominantly the surface polaritonic nature but at higher energies, closer to ℏωsp, it separates from light line and electromagnetic incident field is going to couple to coherent charge oscillations at the surface.…”

Section: Introductionmentioning

confidence: 99%

Adjustable Plasmonic Bandgap in One-Dimensional Nanograting Based on Localized and Propagating Surface Plasmons

Sohrabi

Hamidi

2019

IJOP

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Compared to the long history of plasmonic gratings, there are only a few studies regarding the bandgap in the propagation of plasmonic surface waves. Considering the previous studies on interpretation of plasmonic bandgap formation, we discuss this phenomenon using the effect of both surface plasmon polariton (SPP) and localized surface plasmon (LSP) for our fabricated onedimensional metallic-polymeric grating. This structure is composed of metallic grating on the surface of PDMS with different concentration of embedded gold nanoparticles. By sweeping the incident angles, we have seen that the SPP, LSP and their coupling cause two gaps in reflection regime which are originated from SPP supported by thin film gold film and LSP supported by gold nanoparticles. The first gap is attributed to the patterned metallic film because it vanishes by increasing the nanoparticles which may destroy the pattern while the second gap can be formed by embedded nanoparticles because it becomes more considerable by raising the incubation time. Therefore, the drowning time of patterned samples (e. g. 24h, 48h, and 72h) in HAuCl4 plays the key role in adjustability of plasmonic bandgap. Notably, the interaction between SPP and LSP can be the origin of the shift in gap center from 300 to 550. To best of over knowledge, this study is the first study on the plasmonic band gap as a function of both SPP and LSP.

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Plasmonic Bandgap in 1D Metallic Nanostructured Devices

Cited by 27 publications

References 45 publications

Investigation of Surface Plasmon Polaritons based Gas sensor: Far and Near field Analysis

Investigation of Surface Plasmon Polaritons based Gas sensor: Far and Near field Analysis

Study of Enhanced Photocatalytic Efficiency by Field Confinement in Plasmonic Nanostructures for Their Potential Application for Detection of Pathogenic Bacteria

Adjustable Plasmonic Bandgap in One-Dimensional Nanograting Based on Localized and Propagating Surface Plasmons

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