Super-focusing of visible and UV light using a meta surface

Maklizi, Mahmoud El; Hendawy, Mostafa; Swillam, Mohamed A.

doi:10.1088/2040-8978/16/10/105007

Cited by 20 publications

(14 citation statements)

References 34 publications

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“…In this study, we proposed an optical grating sensor based on dielectric material which is silicon dioxide (SiO2) used as the substrate and silicon (Si) as the top layer of the grating. This structure was previously introduced using epoxy and silicon nitride (Si₂N₃) materials for a visible and infrared range of wavelengths [21]. The same wavelength is used here but with the proposed materials.…”

Section: Introductionmentioning

confidence: 99%

Optofluidic sensor for measuring water salinity

Shafaay

Ghanim

Kreta

et al. 2023

Optical Sensors 2023

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Water salinity analysis is critical for water quality monitoring and evaluation in order to guarantee water safety. Unregulated salinity may be harmful to human health, crops, industry, and the ecosystem. The salinity levels in water sources are constantly changing as a result of natural and anthropogenic ecological change. Exceeding specific salt levels might endanger human health, particularly through drinkable water. In this work, we present a simulation of an optofluidic sensor to measure the water's salinity. We built a design to measure the change in the refractive index in a microfluidic channel based on the dielectric grating. The generated design was modelled to alleviate the manufacturing process of the microfluidic sensor of the saline water. The design was optimized for the range of measurements of the refractive index of saline water by the selection of the material of the sensor.

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Section: Introductionmentioning

confidence: 99%

Optofluidic sensor for measuring water salinity

Shafaay

Ghanim

Kreta

et al. 2023

Optical Sensors 2023

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“…Metamaterial paved the way for numerous applications such as optical sensors [16], super focusing [17] and energy harvesting [18]. Metasurfaces (MS) are special class of metamaterial that is composed of engineered subwavelength nanoresonators [15], [16], [19]- [21]. MSs have been widely explored providing Fano spectral lines for diverse of including optical sensors [11], [13], [22], [23].…”

Section: Introductionmentioning

confidence: 99%

Ultrasensitive biosensor using a Fano resonant asymmetric all-dielectric metasurface

et al. 2023

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Fano resonance is a universal phenomenon that has been widely exploited to achieve spectrally sharp resonances for a variety of applications. Recently, all dielectric metasurface design composed of two silicon resonators, nanodisk and nanobar, exhibits an induced transparency window with ultrahigh quality factor in polarization direction along the nanobar long axis relying on the intriguing physics of Fano resonance. However, the design demonstrates a dispersive behavior within a short spectral range, a phenomenon that hinders its practical usage as a Biosensor due to the lack of the spectral selectivity. In this work, we report the tunable design along the range of wavelengths from 1.2 𝜇m to 1.75 𝜇m through changing the radius of the nanodisk from 200nm to 350nm. Although the design demonstrates a spectral red shift of the reflection with increasing the nanodisk radius, the reflectance behavior is inconsistent indicating the formation of transparency windows in most cases. Worthwhile, the structure design of radius (r=300nm) enables attaining a single sharp Fano resonance addressing the aforementioned short range dispersion obstacle. Meanwhile, the optimized design of radius of (r=300nm) provides a significant quality factor of (~808) and ultrahigh sensitivity of (275nm/RIU) with a figure-ofmerit of (148) at the operating wavelength of (𝜆=1.583𝜇m). The proposed design demonstrates a tremendous impact in refractometric biosensing applications due to its high performance and the ease of fabrication.

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“…First, PM6 has higher photo current (high extication coefficient of both PM6 and Y6),high fill factor and low energy loss. It has a large bandgap of 1.80ev, a strong absorption spectrum of 500nm-700nm, and the highest occupied molecular orbital (HOMO) energy level of -5.54ev that obtained high open circuit voltage second, Y6 has a narrow optical bandgap of 1.33ev, strong nearinfrared light absorption, absorption onset located at 931nm and the highest o ccupied molecular orbital (HOMO) and low unoccupied molecular orbital (LUMO) energy levels at-5.65ev and -4.10ev [10][11][12][13][14][15]. PM6 andY6 blend with absorption bands in visible and near-infrared regions.introducing abroad spectral response in external quantum efficiency (EQE) ranging from 450nm to 830nm.by the study of PM6:Y6 in one blend, the electrostatic interface field for Y6 is large to compensate for the coulomb dissociation barrier and thus enabling barrier -free dissociation [15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

“…Durrant found that composing of PM6:Y6 show a narrow distribution of electronic trap states than other organic blend systems studied and the intra-band gap states(low energetic disorder),low the energetic losses including charge carrier traping into any state that enhance device performance and confirms uniformity and rigidity which enhance carrier dynamics, enable efficient charge generation, reduce the voltage losses in this low energy offset system and reduce charge recombination to Y6 which make this blend has high performance [20][21][22]. Such materials described by non-ideal band edges with significant density of states ,this materials including the presence of tail states(shallow trap states)extending into the bandgap.the tail states have some charactristics like trap depth and density that effect on the devive performance of organic solar cells devices [12][13][14].for example charge trapping into any state effect on charge transport and inc rease recombination.To enhance the absorption of the PM6:Y6 active layer, plasmonic nanoparticles (NPs) and refractory metals play an important role to boost the PCE of OSCs [11][12][13][14][15][16][17][18][19][20]. The most used Plasmonic NPs in literature were gold (Au) and silver (Ag) embedded into one of the OSC layers like the active layer [21][22][23][24][25][26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Enhanced light harvesting in PM6:Y6 organic solar cells using plasmonic nanostructures

Sanad,

Ghanim,

Gad

et al. 2023

Smart Materials for Opto-Electronic Applications

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Organic solar cells (OSCs) are characterized by their low cost, flexibility, compact size, and solution processing. OSCs are created utilizing a nontoxic technology that employs bulkhetrojunction (BHJ) structures. The photo conversion efficiency (PCE) of OSCs has been boasted in the last decades. BHJ fullerene-based OSCs have low open-circuit voltages and poor photo absorption. In this study, the recent non-fullerene acceptor (Y6), which has an electron-deficient core-based central fused ring, has been used. The promising PM6:Y6 material is used as an active layer in the proposed OSCs. The light trapping of the OSCs is enhanced by embedding plasmonic nanoparticles (NPs) in one of its layers. This could be a long-term approach to collecting more light in the photoactive layer. Au and Ag NPs have been employed the most in plasmonic OSCs. They improve PCE due to their plasmonic properties, strong localized surface plasmonic resonance (LSPR) in the visible region of the light spectrum, on-toxicity, and oxidation resistance, although Ag NPs are prone to oxidation. However, they have high costs and thermal instability. Alternative plasmonic materials such as refractory metals with high melting temperatures exceeding 2000°C and high thermal and chemical stability are employed in this work holding a comparative study between them.

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Super-focusing of visible and UV light using a meta surface

Cited by 20 publications

References 34 publications

Optofluidic sensor for measuring water salinity

Optofluidic sensor for measuring water salinity

Ultrasensitive biosensor using a Fano resonant asymmetric all-dielectric metasurface

Enhanced light harvesting in PM6:Y6 organic solar cells using plasmonic nanostructures

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